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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
Showing 1 - 200 of 265 Journals sorted alphabetically
AAS Open Research     Open Access  
Accountability in Research: Policies and Quality Assurance     Hybrid Journal   (Followers: 17)
Acta Materialia Transilvanica     Open Access  
Acta Nova     Open Access  
Acta Scientifica Malaysia     Open Access   (Followers: 1)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
Adıyaman University Journal of Science     Open Access  
Advanced Science     Open Access   (Followers: 12)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 4)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 2)
Advances in Research     Open Access  
Advances in Science and Technology     Full-text available via subscription   (Followers: 16)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 7)
Afrique Science : Revue Internationale des Sciences et Technologie     Open Access   (Followers: 1)
AFRREV STECH : An International Journal of Science and Technology     Open Access   (Followers: 3)
American Academic & Scholarly Research Journal     Open Access   (Followers: 4)
American Journal of Applied Sciences     Open Access   (Followers: 22)
American Journal of Humanities and Social Sciences     Open Access   (Followers: 11)
ANALES de la Universidad Central del Ecuador     Open Access   (Followers: 1)
Anales del Instituto de la Patagonia     Open Access  
Applied Mathematics and Nonlinear Sciences     Open Access  
Apuntes de Ciencia & Sociedad     Open Access  
Arab Journal of Basic and Applied Sciences     Open Access  
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 1)
Archives Internationales d'Histoire des Sciences     Partially Free   (Followers: 5)
Archives of Current Research International     Open Access  
ARO. The Scientific Journal of Koya University     Open Access  
ARPHA Conference Abstracts     Open Access   (Followers: 1)
ARPHA Proceedings     Open Access  
ArtefaCToS : Revista de estudios sobre la ciencia y la tecnología     Open Access  
Asian Journal of Advanced Research and Reports     Open Access  
Asian Journal of Scientific Research     Open Access   (Followers: 2)
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 5)
Australian Field Ornithology     Full-text available via subscription   (Followers: 2)
Australian Journal of Social Issues     Hybrid Journal   (Followers: 6)
Avrasya Terim Dergisi     Open Access  
Bangladesh Journal of Scientific Research     Open Access  
Beni-Suef University Journal of Basic and Applied Sciences     Open Access  
Berichte Zur Wissenschaftsgeschichte     Hybrid Journal   (Followers: 10)
BIBECHANA     Open Access  
Bilge International Journal of Science and Technology Research     Open Access   (Followers: 1)
Bioethics Research Notes     Full-text available via subscription   (Followers: 15)
BJHS Themes     Open Access  
Black Sea Journal of Engineering and Science     Open Access  
Borneo Journal of Resource Science and Technology     Open Access  
Bulletin de la Société Royale des Sciences de Liège     Open Access  
Bulletin of the National Research Centre     Open Access  
Butlletí de la Institució Catalana d'Història Natural     Open Access  
Chain Reaction     Full-text available via subscription  
Ciencia Amazónica (Iquitos)     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencia Ergo Sum     Open Access  
Ciência ET Praxis     Open Access  
Ciencia y Tecnología     Open Access  
Ciencias Holguin     Open Access   (Followers: 1)
CienciaUAT     Open Access  
Citizen Science : Theory and Practice     Open Access   (Followers: 1)
Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering     Open Access  
Communications in Applied Sciences     Open Access  
Comunicata Scientiae     Open Access  
ConCiencia     Open Access  
Conference Papers in Science     Open Access  
Configurations     Full-text available via subscription   (Followers: 11)
COSMOS     Hybrid Journal   (Followers: 1)
Crea Ciencia Revista Científica     Open Access  
Cuadernos de Investigación UNED     Open Access  
Current Issues in Criminal Justice     Hybrid Journal   (Followers: 15)
Current Research in Geoscience     Open Access   (Followers: 5)
Dalat University Journal of Science     Open Access  
Data     Open Access   (Followers: 4)
Data Curation Profiles Directory     Open Access   (Followers: 6)
Dhaka University Journal of Science     Open Access  
Diálogos Interdisciplinares     Open Access  
Digithum     Open Access   (Followers: 2)
Discover Sustainability     Open Access   (Followers: 2)
Einstein (São Paulo)     Open Access  
Ekaia : EHUko Zientzia eta Teknologia aldizkaria     Open Access  
Elkawnie : Journal of Islamic Science and Technology     Open Access  
Emergent Scientist     Open Access  
Enhancing Learning in the Social Sciences     Open Access   (Followers: 7)
Enseñanza de las Ciencias : Revista de Investigación y Experiencias Didácticas     Open Access  
Entramado     Open Access  
Entre Ciencia e Ingeniería     Open Access  
Epiphany     Open Access   (Followers: 1)
Estação Científica (UNIFAP)     Open Access  
Ethiopian Journal of Education and Sciences     Open Access   (Followers: 5)
Ethiopian Journal of Science and Technology     Open Access  
Ethiopian Journal of Sciences and Sustainable Development     Open Access  
European Online Journal of Natural and Social Sciences     Open Access   (Followers: 4)
European Scientific Journal     Open Access   (Followers: 1)
Evidência - Ciência e Biotecnologia - Interdisciplinar     Open Access  
Exchanges : the Warwick Research Journal     Open Access   (Followers: 1)
Experimental Results     Open Access   (Followers: 1)
Facets     Open Access  
Fides et Ratio : Revista de Difusión Cultural y Científica     Open Access  
Fırat University Turkish Journal of Science & Technology     Open Access  
Fontanus     Open Access   (Followers: 1)
Forensic Science Policy & Management: An International Journal     Hybrid Journal   (Followers: 233)
Frontiers for Young Minds     Open Access  
Frontiers in Climate     Open Access   (Followers: 4)
Frontiers in Science     Open Access   (Followers: 1)
Fundamental Research     Open Access  
Futures & Foresight Science     Hybrid Journal   (Followers: 1)
Gaudium Sciendi     Open Access  
Gazi University Journal of Science     Open Access  
Ghana Studies     Full-text available via subscription   (Followers: 15)
Global Journal of Pure and Applied Sciences     Full-text available via subscription  
Global Journal of Science Frontier Research     Open Access   (Followers: 1)
Globe, The     Full-text available via subscription   (Followers: 4)
HardwareX     Open Access  
Heidelberger Jahrbücher Online     Open Access  
Heliyon     Open Access  
Himalayan Journal of Science and Technology     Open Access  
History of Science and Technology     Open Access   (Followers: 2)
Hoosier Science Teacher     Open Access  
Impact     Open Access   (Followers: 1)
Indian Journal of History of Science     Hybrid Journal  
Indonesian Journal of Fundamental Sciences     Open Access  
Indonesian Journal of Science and Mathematics Education     Open Access   (Followers: 2)
Indonesian Journal of Science and Technology     Open Access  
Ingenieria y Ciencia     Open Access   (Followers: 1)
Innovare : Revista de ciencia y tecnología     Open Access  
Instruments     Open Access  
Integrated Research Advances     Open Access  
Interciencia     Open Access  
Interface Focus     Full-text available via subscription  
International Annals of Science     Open Access  
International Archives of Science and Technology     Open Access  
International Journal of Academic Research in Business, Arts & Science     Open Access  
International Journal of Advanced Multidisciplinary Research and Review     Open Access  
International Journal of Applied Science     Open Access  
International Journal of Basic and Applied Sciences     Open Access   (Followers: 1)
International Journal of Computational and Experimental Science and Engineering (IJCESEN)     Open Access  
International Journal of Culture and Modernity     Open Access  
International Journal of Engineering, Science and Technology     Open Access  
International Journal of Engineering, Technology and Natural Sciences     Open Access  
International Journal of Innovation and Applied Studies     Open Access   (Followers: 3)
International Journal of Innovative Research and Scientific Studies     Open Access   (Followers: 1)
International Journal of Network Science     Hybrid Journal   (Followers: 3)
International Journal of Recent Contributions from Engineering, Science & IT     Open Access  
International Journal of Research in Science     Open Access   (Followers: 1)
International Journal of Social Sciences and Management     Open Access   (Followers: 2)
International Journal of Technology Policy and Law     Hybrid Journal   (Followers: 7)
International Letters of Social and Humanistic Sciences     Open Access  
International Scientific and Vocational Studies Journal     Open Access  
InterSciencePlace     Open Access  
Investiga : TEC     Open Access  
Investigación Joven     Open Access  
Investigacion y Ciencia     Open Access   (Followers: 1)
Iranian Journal of Science and Technology, Transactions A : Science     Hybrid Journal  
iScience     Open Access   (Followers: 1)
Issues in Science & Technology     Free   (Followers: 8)
Ithaca : Viaggio nella Scienza     Open Access  
J : Multidisciplinary Scientific Journal     Open Access  
Jaunujų mokslininkų darbai     Open Access  
Journal de la Recherche Scientifique de l'Universite de Lome     Full-text available via subscription  
Journal of Advanced Research     Open Access   (Followers: 2)
Journal of Al-Qadisiyah for Pure Science     Open Access  
Journal of Alasmarya University     Open Access  
Journal of Analytical Science & Technology     Open Access   (Followers: 4)
Journal of Applied Science and Technology     Full-text available via subscription   (Followers: 1)
Journal of Applied Sciences and Environmental Management     Open Access   (Followers: 1)
Journal of Big History     Open Access   (Followers: 3)
Journal of Composites Science     Open Access   (Followers: 3)
Journal of Diversity Management     Open Access   (Followers: 4)
Journal of Indian Council of Philosophical Research     Hybrid Journal  
Journal of Institute of Science and Technology     Open Access  
Journal of Integrated Science and Technology     Open Access  
Journal of King Saud University - Science     Open Access  
Journal of Mathematical and Fundamental Sciences     Open Access  
Journal of Natural Sciences Research     Open Access   (Followers: 1)
Journal of Negative and No Positive Results     Open Access  
Journal of Responsible Technology     Open Access  
Journal of Science (JSc)     Open Access  
Journal of Science and Engineering     Open Access   (Followers: 1)
Journal of Science and Technology     Open Access   (Followers: 2)
Journal of Science and Technology     Open Access   (Followers: 1)
Journal of Science and Technology (Ghana)     Open Access   (Followers: 3)
Journal of Science and Technology Policy Management     Hybrid Journal   (Followers: 1)
Journal of Science Foundation     Open Access   (Followers: 1)
Journal of Science of the University of Kelaniya Sri Lanka     Open Access  
Journal of Scientific Research     Open Access  
Journal of Scientific Research and Reports     Open Access  
Journal of Scientometric Research     Open Access   (Followers: 20)
Journal of Shanghai Jiaotong University (Science)     Hybrid Journal  
Journal of Social Science Research     Open Access   (Followers: 2)
Journal of Taibah University for Science     Open Access  
Journal of the Asiatic Society of Bangladesh, Science     Open Access  
Journal of the Ghana Science Association     Full-text available via subscription   (Followers: 3)
Journal of the History of Ideas     Full-text available via subscription   (Followers: 133)
Journal of the Indian Institute of Science     Hybrid Journal   (Followers: 3)
Journal of the National Science Foundation of Sri Lanka     Open Access  
Journal of the Royal Society of New Zealand     Hybrid Journal   (Followers: 48)
Journal of the South Carolina Academy of Science     Open Access  
Journal of Unsolved Questions     Open Access  
Jurnal Ilmiah Ilmu Terapan Universitas Jambi : JIITUJ     Open Access  
Jurnal Matematika, Sains, Dan Teknologi     Open Access  
Jurnal MIPA     Open Access  
Jurnal Natural     Open Access  
Jurnal Sains Dasar     Open Access  

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Journal of the Indian Institute of Science
Journal Prestige (SJR): 0.212
Citation Impact (citeScore): 1
Number of Followers: 3  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0970-4140 - ISSN (Online) 0019-4964
Published by Springer-Verlag Homepage  [2469 journals]
  • Towards a Sustainable Future with Materials

    • Free pre-print version: Loading...

      PubDate: 2022-05-26
       
  • The Development of Bayesian Statistics

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      Abstract: The incorporation of Bayesian inference into practical statistics has seen many changes over the past century, including hierarchical and nonparametric models, general computing tools that have allowed the routine use of nonconjugate distributions, and the incorporation of model checking and validation in an iterative process of data analysis. We discuss these and other technical advances along with parallel developments in philosophy, moving beyond traditional subjectivist and objectivist frameworks to ideas based on prediction and falsification. Bayesian statistics is a flexible and powerful approach to applied statistics and an imperfect but valuable way of understanding statistics more generally.
      PubDate: 2022-05-21
       
  • IntroSurvey of Representation Theory

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      Abstract: There could be thousands of Introductions/Surveys of representation theory, given that it is an enormous field. This is just one of them, quite personal and informal. It has an increasing level of difficulty; the first part is intended for final year undergrads. We explain some basics of representation theory, notably Schur–Weyl duality and representations of the symmetric group. We then do the quantum version, introduce Kazhdan–Lusztig theory, quantum groups and their categorical versions. We then proceed to a survey of some recent advances in modular representation theory. We finish with 20 open problems and a song of despair.
      PubDate: 2022-05-17
       
  • Guest Editorial: Materials for a Sustainable Future

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      PubDate: 2022-05-10
       
  • Clinician Scientists in the Indian Context

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      Abstract: Advances in healthcare are fueled by discovery and innovation in science and technology. However, such discovery and innovation cannot occur without vital inputs from a clinician. Here, we make a case for the training of clinicians as scientists and engineers to help integrate over disciplines and accelerate translational research in India. We identify and suggest possible solutions to the challenges of creating an Indian clinician-scientist. We further take stock of programs across the globe, initiatives in India, including at our institute, and highlight possible paths that could be taken to train such individuals. With an adequate investment of effort and time, we believe that the clinician-scientist will have the ability to transform healthcare in India.
      PubDate: 2022-05-04
       
  • Editor’s Desk

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      PubDate: 2022-04-28
       
  • Likelihood Ratio Tests for Elaborate Covariance Structures and for MANOVA
           Models with Elaborate Covariance Structures—A Review

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      Abstract: In this paper a review is made from the primordia of the history of likelihood ratio tests for covariance structures and equality of mean vectors through the development of likelihood ratio tests that refer to elaborate covariance structures. Relations are established among several covariance structures, taking more elaborate ones as umbrella structures and examining then their particular cases of interest. References are made to bibliography where the corresponding likelihood ratio tests are developed and the distributions of the corresponding statistics addressed. Most of the likelihood ratio test statistics for one-way manova models where the covariance matrices have elaborate structures were developed quite recently. Also for these likelihood ratio tests a similar approach is taken. Although we start with the common test that uses unstructured covariance matrices, then we go on to consider tests with more elaborate covariance structures, and subsequently we specify them to their particular cases of interest. Some special attention is also given to the so-called Wilks \(\Lambda\) statistics.
      PubDate: 2022-04-17
       
  • Review: Fatigue of Fiber-Reinforced Composites, Damage and Failure

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      Abstract: A concise review of fatigue of fiber-reinforced composites, covering fatigue life and damage development and how the properties of constituents, orientations and other parameters affect fatigue life, is presented. The subject broadly covers polymer, metal, and ceramic matrix composites, by including specific examples of fatigue data from literature. Studies of composite fatigue have mostly evolved over the last 60 years, largely driven by aerospace applications of composites. The field is very vast in terms of accumulated technical literature and fatigue data. Therefore, only some iconic examples, each with good experimental data, have been considered in this review to illustrate the behavior and the trends as clearly as possible. First, the general nature of tensile deformation of fiber composites under various combinations of fiber and matrix failure strains are reviewed to provide a background with which the more complicated fatigue behavior can be easily understood. Second, examples of S–N fatigue data of glass (GFRP) and carbon (CFRP) fiber-reinforced plastics are provided, illustrating the effects of reinforcement, constituent properties, temperature, and orientation effects on fatigue failure. These analyses are also modeled by S–N curve calculations using exponential S–N fatigue constitutive equations proposed by author. These calculations helped to easily rationalize the trends in S–N data, as influenced by strength and failure strains of fiber and matrix. Next, stiffness degradation behavior in fiber composites are reviewed, with specific examples including CFRP (polymer matrix) and SiC/SiC (ceramic matrix) composites. The nature of stiffness degradation is also modeled using a semi-empirical equation that relates the fractional remaining stiffness to fractional remaining fatigue life in the composite. Finally, a few examples of fatigue behavior of laminated composites that are typically used in real-world applications are reviewed.
      PubDate: 2022-03-25
      DOI: 10.1007/s41745-021-00280-y
       
  • Bayesian Modeling of Discrete-Time Point-Referenced Spatio-Temporal Data

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      Abstract: Discrete-time point-referenced spatio-temporal data are obtained by collecting observations at arbitrary but fixed spatial locations \(\varvec{s}_{1},\varvec{s}_{2},\ldots ,\varvec{s}_{n}\) at regular intervals of time \(t := 1,2,\ldots ,T\) . They are encountered routinely in meteorological and environmental studies. Gaussian linear dynamic spatio-temporal models (LDSTMs) are the most widely used models for fitting and prediction with them. While Gaussian LDSTMs demonstrate good predictive performance at a wide range of scenarios, discrete-time point-referenced spatio-temporal data, often being the end product of complex interactions among environmental processes, are better modeled by nonlinear dynamic spatio-temporal models (NLDSTMs). Several such nonlinear models have been proposed in the context of precipitation, deposition, and sea-surface temperature modeling. Some of the above-mentioned models, although are fitted classically, dynamic spatio-temporal models with their complex dependence structure, are more naturally accommodated within the fully Bayesian framework. In this article, we review many such linear and nonlinear Bayesian models for discrete-time point-referenced spatio-temporal data. As we go along, we also review some nonparametric spatio-temporal models as well as some recently proposed Bayesian models for massive spatio-temporal data.
      PubDate: 2022-03-25
      DOI: 10.1007/s41745-022-00298-w
       
  • Mutations and the Distribution of Lifetime Reproductive Success

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      Abstract: Evolution proceeds in large part by the establishment of mutations in the genome of organisms, but even an advantageous mutation may be lost by chance. The probability of such loss is the extinction probability of an individual with a random lifetime reproductive success (LRS). We show here that the traditional approximation of extinction probability in terms of the mean and variance of LRS does not always apply, because the LRS has a skewed, often multimodal, distribution. To exemplify distinct life history patters, we use the Hadza and Pacific Chinook salmon. The traditional approximation overestimates the exact extinction probability from complete LRS distribution. An accurate analysis of the distribution of LRS strengthens our ability to successfully analyze evolution.
      PubDate: 2022-03-25
      DOI: 10.1007/s41745-022-00297-x
       
  • Phase-field Modeling of Phase Transformations in Multicomponent Alloys: A
           Review

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      Abstract: Almost all alloys of engineering importance are multicomponent in character. Multicomponent alloys are subject to complex interplay of thermodynamic and kinetic parameters and display a rich variety of microstructural features which are not seen in binary alloys. Achieving microstructural control of multicomponent alloys is central to their efficacy in specific applications. Unraveling the chemistry-thermomechanical processing-microstructure relationships in multicomponent alloys only through experiments have been proven to be a resource intensive approach. Quantitative simulations of microstructural evolution in multicomponent alloys using the technique of phase-field modeling can significantly offset the experimental burden and provide an energy efficient and sustainable framework for alloy design. In this review, we focus on those phase-field models which can consider the evolution of multiple phases simultaneously in a multicomponent system and attempt to understand the history of their emergence as tools of predictive value. We briefly review the studies conducted with such multiphase, multicomponent phase-field models and conclude with a commentary on the future role of phase-field modeling towards the sustainable development of novel multicomponent alloys.
      PubDate: 2022-03-20
      DOI: 10.1007/s41745-022-00288-y
       
  • Empirical Bayes and Selective Inference

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      Abstract: We review the empirical Bayes approach to large-scale inference. In the context of the problem of inference for a high-dimensional normal mean, empirical Bayes methods are advocated as they exhibit risk-reducing shrinkage, while establishing appropriate control of frequentist properties of the inference. We elucidate these frequentist properties and evaluate the protection that empirical Bayes provides against selection bias.
      PubDate: 2022-03-07
      DOI: 10.1007/s41745-022-00286-0
       
  • Fractional Processes and Their Statistical Inference: An Overview

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      Abstract: We give an overview of properties of fractional processes such as fractional Brownian motion, mixed fractional Brownian motion, sub-fractional Brownian motion, fractional Lévy process , fractional Poisson process and present a short review of problems of statistical inference for processes driven by fractional processes.
      PubDate: 2022-02-24
       
  • Statistical Thermal Efficiency and Quantum Interactions

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      Abstract: We statistically deal with two distinct quantum interactions embedded within an exactly solvable model that mimics some well known nuclear effects. By recourse to finite temperature statistical quantifiers we describe how these two fermion–fermion interactions compete and strongly influence each other. Statistically scrutinizing such competition leads to interesting insights on many body dynamics’ features. We discuss, in particular, the thermal efficiency of the fermion–fermion interactions
      PubDate: 2022-02-23
       
  • Neutralizing Antibodies and Antibody-Dependent Enhancement in COVID-19: A
           Perspective

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      Abstract: Antibody-dependent enhancement (ADE) is an alternative route of viral entry in the susceptible host cell. In this process, antiviral antibodies enhance the entry access of virus in the cells via interaction with the complement or Fc receptors leading to the worsening of infection. SARS-CoV-2 variants pose a general concern for the efficacy of neutralizing antibodies that may fail to neutralize infection, raising the possibility of a more severe form of COVID-19. Data from various studies on respiratory viruses raise the speculation that antibodies elicited against SARS-CoV-2 and during COVID-19 recovery could potentially exacerbate the infection through ADE at sub-neutralizing concentrations; this may contribute to disease pathogenesis. It is, therefore, of utmost importance to study the effectiveness of the anti-SARS-CoV-2 antibodies in COVID-19-infected subjects. Theoretically, ADE remains a general concern for the efficacy of antibodies elicited during infection, most notably in convalescent plasma therapy and in response to vaccines where it could be counterproductive.
      PubDate: 2022-02-04
       
  • Fifty Years with the Cox Proportional Hazards Regression Model

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      Abstract: The 1972 paper introducing the Cox proportional hazards regression model is one of the most widely cited statistical articles. In the present article, we give an account of the model, with a detailed description of its properties, and discuss the marked influence that the model has had on both statistical and medical research. We will also review points of criticism that have been raised against the model.
      PubDate: 2022-01-23
       
  • The Kullback–Leibler Divergence Between Lattice Gaussian
           Distributions

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      Abstract: A lattice Gaussian distribution of given mean and covariance matrix is a discrete distribution supported on a lattice maximizing Shannon’s entropy under these mean and covariance constraints. Lattice Gaussian distributions find applications in cryptography and in machine learning. The set of Gaussian distributions on a given lattice can be handled as a discrete exponential family whose partition function is related to the Riemann theta function. In this paper, we first report a formula for the Kullback–Leibler divergence between two lattice Gaussian distributions and then show how to efficiently approximate it numerically either via Rényi’s \(\alpha \) -divergences or via the projective \(\gamma \) -divergences. We illustrate how to use the Kullback-Leibler divergence to calculate the Chernoff information on the dually flat structure of the manifold of lattice Gaussian distributions.
      PubDate: 2022-01-23
       
  • A Review of Lamellar Eutectic Morphologies for Enhancing Thermoelectric
           and Mechanical Performance of Thermoelectric Materials

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      Abstract: We present in this review how the existence of lamellar eutectic morphologies in different classes of thermoelectric systems has been explored to enhance the thermoelectric and mechanical performance of such systems. Following a brief discussion on the physics of thermoelectricity, the case for using eutectic morphologies to achieve similar thermoelectric performance compared to those reported in multilayer thin-film and superlattice, was presented. This was followed by the presentation of eutectic morphologies in different classes of thermoelectric systems from traditional chalcogenide to half-Heusler and high-entropy alloys. Eutectic lamellar can be quickly produced in large quantities via traditional metallurgy routes that are cost-effective and can be scaled compared to other synthesis routes. As this review shows, eutectic morphologies could play a double role in simultaneously improving a thermoelectric device's thermoelectric and mechanical performance. These devices are of macroscale dimensions and require some measure of good energy conversion efficiencies and mechanical stability simultaneously.
      PubDate: 2022-01-01
       
  • A Review on Micro-mechanical Testing of NiTi-Based Shape Memory Alloys

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      Abstract: NiTi-based shape memory alloys are considered as potential candidates for various structural, functional and biomedical applications. This is particularly related to their unique characteristics such as pseudoelastic and shape memory effects. Considering the increasing demand of NiTi alloys in miniaturized devices, the small-scale deformation micro-mechanisms of such a material system is being thoroughly reviewed in this article. At the first hand, the fundamental characteristics of NiTi system is discussed briefly. The influence of different factors such as chemical composition, crystallographic phases and precipitates on the phase transformation and mechanical behavior of the material are emphasized next. Subsequently, an extensive overview is provided regarding the assessment of small-scale deformation behavior of NiTi alloys using two prime techniques: micro-pillar compression and instrumented nanoindentation. Pros and cons for both the characterization techniques are analyzed as well. Interestingly, uniaxial compression of the micro-pillar reveals the pseudoelastic behavior in the alloy with remarkable enhancement in martensitic transformation stress and plateau strain with respect to those observed from macro-scale testing. It is also evident from the studies that mechanical behavior of the material strongly depends on different crystallographic orientation. Contrary to the uniaxial compression, nanoindentation generates triaxial state of stress beneath the tip of indenter, which is likely to influence the deformation micro-mechanism for the NiTi system, as well. Variation in hardness, elastic modulus and recoverability of NiTi system are primarily assessed through nanoindentation-based studies. In addition, recent studies highlight the importance of optimizing the nanoindentation parameters such as tip configuration, tip radius and load level for precise estimation of pseudoelastic activity in the alloy. Moreover, a simplified approach is generated for estimating the indentation stress–indentation strain curve. Overall, this paper generates a thorough and comprehensive insight about the micro-mechanical testing of NiTi-based shape memory alloys.
      PubDate: 2022-01-01
       
  • Recent Advances in Alloy Development for Metal Additive Manufacturing in
           Gas Turbine/Aerospace Applications: A Review

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      Abstract: A dozen or so alloys have been occupying the alloy landscape in metal additive manufacturing (MAM) in terms of addressing all aspects of research, aiding the maturity of development of these alloys towards various qualified applications for the aerospace/gas turbine sector, in the last decade or so. These include, AlSi10Mg, Al7Si0.5 Mg (F357), AlMgSc, Ti6Al4V, γ-TiAl, CoCrMo, Stellite12, IN718, IN625, CM247LC, HastelloyX, SS316L, CuCrNb, CuCrZr, to name a few. There has been a tremendous interest in the design and development of novel high temperature materials for MAM MAM: Metal Additive Manufacturing is a layer-by-layer manufacturing process making use of digital manufacturing, using lasers, electron beam, plasma, to melt powders and wires to enable direct manufacturing of metallic parts. , with isotropic microstructure and high defect tolerance, to facilitate accelerated adoption of this technology to the aerospace sector. These include developing difficult to weld chemistries, alloys prone to cracking, alloys with improved high temperature properties, composite materials and creating novel alloys that are otherwise not achievable via conventional manufacturing. This article comprises a review of some of the innovations in alloy development that have been explored in recent times, comprising Aluminum, Titanium, Nickel, Cobalt, Copper, and others, with relevance to the gas turbine/aerospace arena. This includes over 100 different alloys that have been studied via laser powder bed fusion, direct energy deposition, binder jet technology, along with some novel methods of manufacturing new materials via MAM, to give a flavour for the importance that this subject has garnished in the scientific community in recent times.
      PubDate: 2022-01-01
       
 
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