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  • Electronic Resource  (20)
  • 2005-2009  (20)
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  • Electronic Resource  (20)
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  • 1
    Electronic Resource
    Electronic Resource
    Fatigue-Crack-Growth Behavior of Ultrafine-Grained Al-Mg-Sc Alloy Produced by ECAP (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 584-586 (June 2008), p. 821-826 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Fatigue-crack-growth in an ultrafine-grained (UFG) Al-6%Mg-0.3%Sc alloy isinvestigated in conjunction with a precise analysis of the fracture surface. The comparison of thecrack growth behavior of the UFG and ordinary polycrystalline materials has shown that the fatiguecrack growth rate in the UFG alloy is higher than that in the coarse-grained material only in thenear-threshold region. In the intermediate fatigue stage, propagation of the fatigue-crack in the UFGstructure becomes insensitive to the grain size. At larger stress-intensity-factor-increments, [removed info]K, thecrack resistance of the UFG material is better than that of un-ECAPed specimen. Analysis of thesurface features indicates that such inhibition of the crack growth in the UFG structure uponincreasing [removed info]K may be related to the gradual transition from intergranular- to transgranular mode offatigue fracture
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.821.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of Processing Routes on Wear Property of Al-Al〈sub〉3〈/sub〉Ti Alloys Severely Deformed by ECAP (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 584-586 (June 2008), p. 971-976 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Al-Ti alloys, which have Al3Ti platelet particles in Al matrix, were deformed by ECAPwith routes A and Bc. With increasing the number of ECAP passes, Al3Ti platelet particles arefragmented and their sizes decrease. The microstructure of ECAPed Al-Ti alloy specimens by routeA has a strong alignment of the fragmented Al3Ti particles. On the other hand, ECAPed Al-Ti alloyspecimens by route Bc have a relatively homogeneous distribution of Al3Ti particles comparing withthe specimen deformed by route A. Based on these results, it was found that ECAPed Al-Ti alloyspecimen by route A has highly anisotropic microstructure. However, both ECAPed specimens withroutes A and Bc have no anisotropic wear property. That is because the wear property of the Al-Tialloy specimen depends on the shape of the Al3Ti particle. From these results, it was found that SPDinduced by ECAP is an effective processing method to make homogeneous wear property for themetallic material containing platelet solid-particles
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.971.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Aluminum Matrix Texture and Particle Characterization in Al-Al〈sub〉3〈/sub〉Ti FGMs Produced by a Centrifugal Solid-Particle Method (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 105 (July 2005), p. 415-420 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The centrifugal solid-particle method has proved to be effective in producing functionally graded materials (FGMs). In this study, Al-Al3Ti FGMs, were produced by this centrifugal method, from an Al-5 wt % Ti master alloy. Applied centrifugal forces were 30, 60 and 120G (units of gravity). Samples from the outer surface of each specimen were cut and aluminum matrix texture analyzed by Schulz reflection method. Analysis of the resulting pole figures indicates a preferred orientation along the (200) plane for the aluminum matrix crystals. Furthermore, increasing the applied centrifugal force enhances the orientation effect. Al3Ti platelet orientation and area fraction at the samples’ outer surface along three observation planes were also measured. The Al3Ti platelets in the outer region are orientated perpendicular to the centrifugal force direction along two of the observed planes, also an increase in centrifugal force leads to an increase in orientation in those two planes. The intermetallic particle volume fraction also increases with higher applied centrifugal force, although not significantly. A correlation appears to exist between particle orientation and the preferred orientation of the matrix
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/21/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.105.415.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of Processing Temperature on Microstructure Developmentduring ECAP of Al-Mg-Sc Alloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 584-586 (June 2008), p. 481-486 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Microstructural evolution taking place during equal channel angular pressing (ECAP) wasstudied in a commercial coarse-grained Al-6%Mg-0.4%Mn-0.3%Sc alloy in a temperature interval 200-450oC (~0.5-0.8 Tm). Samples were pressed using route A to a total strain of 12 and quenched in waterafter each ECAP pass. Uniform fine-grained microstructures with the average grain sizes of 0.7 and 2.50m, are almost fully evolved at high ECAP strains at 250oC and 450oC, respectively, while ECAP at300oC (~0.6 Tm) leads to the formation of bimodal grain structure with fine grains of around 1 µm andrelatively coarse grains of around 8 µm. The latter are developed due to the occurrence of staticrecrystallization during “keeping” time in the ECAP channel and/or reheating between ECAP passes. Themicrostructural development under warm-to-hot ECAP conditions is discussed in terms of the largepotential for grain boundary migration resulted from an overlapping of accelerated grain boundarymobility at high pressing temperatures and enhanced driving force for recrystallization, which is caused bya strong inhibition of dynamic recovery in a heavily-alloyed Al alloy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.481.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Characterization of Al3Fe Particle within Al-Al3Fe Functionally Graded Material Fabricated by Semi-Solid Forming (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 1503-1506 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Near net shape forming of Al-Al3Fe functionally graded materials (FGMs) have been studied. FGM billets fabricated by a centrifugal method were extruded under the condition of a mixture of molten Al eutectic and solid Al3Fe particles. Both distribution and profile of Al3Fe particles were characterized by and the variation of volume fraction of Al3Fe particles was observed. Shore hardness of the Al matrix was also measured to evaluate the strength of the FGM before and after the semi-solid forming associated with the character of distributed Al3Fe particles. It wasconfirmed that Shore hardness increased with increasing the volume fraction of Al3Fe particles and after the semi-solid forming than before. This was due to the fact that Al3Fe particles after the semi-solid forming became fine by shear stress introduced by liquid Al flow
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.1503.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Development of Fe-Mn-Si-Cr Shape Memory Alloy Fiber Reinforced Plaster-Based Smart Composites (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 2063-2066 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In previous studies, it has been found that the shape memory effect of the embeddedstraight and wavy shape memory alloy (SMA) fibers enhance the strength and energy absorption prior to fracture of the composite, where the embedded SMA fibers shrink due to their shape memory effect. In the case of wavy fiber reinforced composites, the SMA fibers were subjected to pre-tensile strain using fiber holder with rotatable rollers to maintain the constant periodicity and amplitude of wavy fibers. In this study, on the other hand, the wavy SMA fibers were subjected to pre-tensile strain without using fiber holder, and therefore, periodicity and amplitude of wavy fibers were varied during the deformation. Then the wavy SMA fiber reinforced smart composite is fabricated. For the mechanical property characterization, three-point bending test is performed for the specimens
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.2063.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Grain Refinement Performance of Aluminium Cast-Alloy by Deformed Al-Al〈sub〉3〈/sub〉Ti Alloy Refiner (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 519-521 (July 2006), p. 1859-1864 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Grain refining experiments for casting of pure Al were conducted to evaluate the grainrefinement performance of an Al-5mass%Ti alloy refiner before and after cold rolling. Al3Tiparticles in the Al-Ti alloy refiner were efficiently fragmented by cold rolling. The size of theAl3Ti particles in cold rolled Al-Ti alloy refiner decreased from 280μm to 30μm with increasingreduction ratio of cold rolling. Mean size of α-Al grains in pure Al cast refined by the cold rolledAl-Ti alloy refiner decreased from about 500μm to 200μm with increasing the reduction ratio. Inorder to investigate mechanical property of the pure Al cast refined by the cold rolled Al-Ti alloyrefiner, Vickers hardness test and tensile test were conducted. Strength of the pure Al cast refinedby the cold rolled Al-Ti alloy refiner increased with increasing the reduction ratio. The strengthimprovement of pure Al cast refined by the cold rolled Al-Ti alloy refiner followed Hall-Petchrelationship. From obtained results, it was concluded that cold rolling for refiner is usefulpractical application for pure Al cast
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.1859.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Mechanical and Physical Properties of Ni〈sub〉3〈/sub〉Al-Based Alloys with Cr Carbides Dispersion (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 439-442 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Ni3Al-based alloys possess good oxidation resistance, moderate room and hightemperature strength and ductility. Introduction of Cr-carbide particles through a solidification routeis attempted to provide higher hardness and wear resistance. The mechanical and physicalproperties are measured at room temperature for several alloys with various carbon concentrationsup to 2.0 wt.%. Hardness and wear resistance as well as compressive strength increase withincreasing carbon concentration, while bend ductility decreases. Adhesion between carbides andmatrix phase is good, and cracks propagate mainly through carbides. The crystallographicorientation relationships between constituent phases are also attempted using electronback-scattering diffraction (EBSD) technique. The thermal conductivity is found to be less sensitiveto the alloy composition
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.439.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Formation of Compositional Gradient during Fabrication of FGMs by a Centrifugal In Situ Method (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 492-493 (Aug. 2005), p. 693-698 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The purpose of the present work is to study the formation of the compositional gradient during the fabrication of FGMs by a centrifugal in-situ method. Al-Al2Cu FGMs were fabricated by the centrifugal in-situ method using eutectic Al-33mass%Cu alloy, and the microstructures of fabricated FGMs were studied. It was found that the Al-Al2Cu FGMs could be fabricated by the centrifugal in-situ method from eutectic alloy. Based on the experimental results, the formation mechanism of the compositional gradient during the fabrication of FGM by the centrifugal in-situ method in the A-B alloy could be summarized as follows; 1) Partial separation of A and B elements in the liquid state occurs due to the density difference. 2) A compositional gradient is formed before the crystallization of the primary crystal. 3) The primary crystals in the matrix appear to depend on local chemical composition. 4) The primary crystals migrate according to density difference, and a further compositional gradient is formed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.492-493.693.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Graded Microstructure at Fiber (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 492-493 (Aug. 2005), p. 737-742 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The reaction at narrow holes method (RANH method) has been proposed for fabricating fiber reinforced metal (FRM), such as an intermetallic compound fiber / metal matrix composite. This study clarifies a microstructure at a fiber / metal matrix interface of FRM fabricated by using a combination of pure-copper and pure-aluminum in the RANH method. Pure-aluminum fiber was inserted into a narrow hole drilled in the copper matrix. The assembly comprising the pure-aluminum fiber and the pure-copper matrix was heated to a temperature greater than eutectic temperature of the copper-aluminum binary alloy. A molten aluminum reacted with copper to form an annular reacted region consisting of g1 intermetallic compound in a single phase near the edge of the narrow hole. The g1 intermetallic compound has very high hardness on the order of 800-900 HV. The annular reacted region may have a high tensile strength and may work as a reinforcing metal fiber in FRM
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.492-493.737.pdf
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