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  • 1
    Electronic Resource
    Electronic Resource
    Structural Evolution of Al-Cr Alloy during Processing (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 138 (Mar. 2008), p. 145-152 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Aluminium-chromium based alloys are promising candidates for manufacture of lightcomponents exposed to elevated temperatures. The work describes properties of Al-6.0wt.%Cr-2.1wt.%Fe-0.5wt.%Ti alloy. The rapidly solidified powder was prepared by the pressure nitrogenmelt atomization. The powder was then subject to heat treatment in order to investigate solid statephase transformations. Compaction of the powder was carried out by hot extrusion after preheatingat 450 °C. Microstructure, phase composition and structural transformations on heat treatment wereinvestigated in the as-atomized powder, as well as in the as-extruded alloy. It is found thatmetastable state of the rapidly solidified powder is characterized by presence of quasi-crystallinephases and supersaturated solid solution. Heating before and during the hot extrusion inducesdecomposition of the supersaturated solid solution and quasicrystalline to crystalline phasetransformations. The hot extruded alloy has a refined recrystallized structure that remains verystable aven after long-term annealing at 400 °C. Mechanical properties of the extruded alloy arediscussed in terms of strengthening mechanisms
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.138.145.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Structure and Properties of PM Nano-Crystalline Al-Cr based Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 567-568 (Dec. 2007), p. 197-200 
    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 the presented paper, properties of Al-Cr-Fe-Ti alloy produced by powder metallurgy(PM) are described. Rapidly solidified powder alloy was prepared by the pressure nitrogen meltatomization. The granulometric powder fraction of less than 45 μm was then hot-extruded.Microstructure of the as-extruded material comprised recrystallized α-Al grains and spheroids ofintermetallic phases. Tensile strength of the investigated material was similar to that of aconventional casting Al-Si alloy commonly used in elevated temperature applications. Excellentthermal stability of the PM Al-Cr based material, which much exceeded the elevated temperaturecasting alloy, was proved by room temperature tensile tests after long-term annealing at elevatedtemperature. Reasons for the observed thermal stability of the investigated PM alloy are discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.567-568.197.pdf
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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