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International Journal of Material and Mechanical Engineering
   [3 followers]  Follow    
  This is an Open Access Journal Open Access journal
     ISSN (Print) 2162-0695 - ISSN (Online) 2164-280X
     Published by Science and Engineering Publishing Company Homepage  [46 journals]
  • Magnetic Interactions in F.C.C. Fe–Pt Alloys

    • Abstract: Magnetic Interactions in F.C.C. Fe–Pt Alloys
      Pages 45-53
      Author S. O. PonomaryovaV. A. TatarenkoYu. M. KovalV. V. OdnosumO. P. Ponomaryo
      Exchange integrals for f.c.c. Fe–Pt alloys in the whole platinum content range are estimated. Temperature dependences of spontaneous magnetizations of Fe and Pt subsystems for various platinum contents are obtained.
      PubDate: 2014-05
       
  • Structural Characterization and Its Physical Properties of Non-standard A1
           Austenite Steel

    • Abstract: Structural Characterization and Its Physical Properties of Non-standard A1 Austenite Steel
      Pages 38-44
      Author A.K. JahjaNurdin Effend
      New austenite stainless steel code-named A1 has been synthesized using the foundry method. The steel was prepared using mineral elements extracted from crude ores in Indonesian mines and commercial scrap materials, in this case ferro scrap, ferro chrome, nickel, manganese, and ferro silicon; all of them were in the granular shape. The starting materials are inserted into an induction foundry furnace that operates on an electromagnetic inductive-thermal system. Moreover, a small quantity of titanium was added to this austenite steel that already has a very low carbon content. The neutron diffraction pattern shows that the material had an fcc crystal structure with lattice parameter of 3.5935 Å. Neutron diffraction residual stress and texture measurements were performed on the austenite samples. The residual stress along the [220] crystallographic direction in the A1 alloy is compressive except in the normal direction where it is tensile. Tension as high as -629 MPa was observed in both the axial, transversal and normal directions. No region of high pole densities has been found in the material indicating a weak texture. The average value of the observed hardness is around of 205 on the Vickers scale for original casting sample; and the average hardness value of normalized austenite stainless-steels is also shown to be approximately 195 on the Vickers scale.
      PubDate: 2014-05
       
  • Effect of Si and Mg Addition on Dry Sliding Wear of Al-Fly Ash Metal
           Matrix Composite

    • Abstract: Effect of Si and Mg Addition on Dry Sliding Wear of Al-Fly Ash Metal Matrix Composite
      Pages 31-37
      Author S. SarkarS. TripathyS. Moha
      The present investigation has been focused on the utilization of abundantly available industrial waste, fly ash in useful manner by dispersing it into aluminium/aluminium-magnesium/aluminium-silicon matrices to produce composites by liquid metallurgy route. The wide size range (0.1-100µm) of fly ash particles was used The dry sliding wear behavior of the composites in the cast conditions was studied at different loads and different sliding velocities using Pin-On-Disc configuration wear testing machine. The worn surfaces and wear debris were analyzed using optical microscope and scanning electron microscope.
      PubDate: 2014-05
       
  • Performance of Maize Inbred Lines and Their Hybrids Under Varying Drought
           Stress Conditions in Mali

    • Abstract: Performance of Maize Inbred Lines and Their Hybrids Under Varying Drought Stress Conditions in Mali
      Pages 17-30
      Author Coulibaly Mamadou MoryEssie BlayVernon GracenThe CharlesNiaba Tem
      Recurrent drought is one of the major constraints to maize production in West Africa. It can be devastating if it occurs for a long period, especially during flowering. Hybrid maize varieties that are tolerant to drought are not available. Therefore, many farmers in Mali have not yet adopted hybrid maize varieties. In this study, maize inbreds and hybrids were evaluated for their tolerance to drought and the gene effects conditioning performance under both drought and no drought conditions were studied to identify hybrids tolerant to drought stress that could be released. The association of inbred root characteristics and tolerance to drought was also evaluated. Hybrids generated from crosses between thirteen inbred lines were evaluated for drought tolerance. Seventy-eight hybrids and two checks were evaluated under water stress and non-water stress conditions across four environments during the off-season of 2010. The seventy-eight hybrids were obtained from a diallel cross of thirteen parents. The test sites included: Farako (10°50’00’’ North 6°51’0’’ West), Sotuba (12°39’47’’North 7°54’50’’ West) and Yanfolila (11°11’0’’ North 8°9’0’’). Two planting dates were used to create two different environments at Farako. The experiment consisted of a split-plot with water regime as the main plot and hybrids as the sub plots. The water regime consisted of a well watered plot where irrigation was supplied through-out the plant cycle and a drought imposed plot where irrigation was stopped 40 days after planting for 20 days. The sub-plots consisted of the 78 hybrids and checks arranged in an alpha lattice with two replications. Water stress increased anthesis-silking interval resulting in reduced grain yield. Hybrid V841-73/9071 had the lowest grain yield reduction (35.3%) due to water stress, followed by CML 505/1368 (41.9%). Line 9071 has good root weight and good root number under stress while line1368exhibited good root number, good root length and good root weight under stress. The following Genotypes9071/CML442; CML442/TZ COMP3-C2-S2, 87036/CML442, CML505/1368, V481-73/CML442, C11O-5/9071, J-16-1/TZ COMP3-C2-S2 and CML444/87036 performed well under both well watered and water stress conditions. The inbreds 9071 and CML442 exhibited the highest frequency of appearance as parents among the best hybrids both under well watered and water stress conditions demonstrating their superior SCA with some of the other parental inbreds studied here.
      PubDate: 2014-05
       
 
 
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