半凝固遠心鋳造法により作製したAl-Cr-Cu合金管の組織と耐摩耗性  [in Japanese] Structure and Wear Resistance of Al-Cr-Cu Alloy Pipes Produced by a Semi-Solid Centrifugal Casting Process  [in Japanese]

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Author(s)

    • 大参 達也 OHMI Tatsuya
    • 北海道大学大学院工学研究科 Division ot Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
    • 室田 康宏 MUROTA Yasuhiro
    • 北海道大学大学院工学研究科 Division ot Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
    • 工藤 昌行 KUDOH Masayuki
    • 北海道大学大学院工学研究科 Division ot Materials Science and Engineering, Graduate School of Engineering, Hokkaido University

Abstract

The solidification structure, hardness and wear resistance of surface composite castings of an Al-Cr-Cu alloy produced by a two-step process of stir-mix-quenching and centrifugal casting have been investigated. In this process, two kinds of molten metals with different compositions are mixed with agitation in a mixing vessel to produce semi-solid slurry containing fine intermetallic crystals, and then the slurry is centrifugally cast. In the stir-mix-quenching experiments, a hypoeutectic Al-Cu alloy melt was used for “the first melt” which acts as a coolant, and a hyperperitectic Al-Cr alloy melt with a higher liquidus temperature was used for “the second melt,” which is rapidly quenched to precipitate numerous primary intermetallic crystals when it is brought into contact with the first melt.<BR>The structure, hardness and wear resistance of the specimen vary with the mass fraction of α-phase (aluminum solid solution) in the slurry. As the fraction of α-phase increases, the volume of macroscopic pores and hardness of the composite layer decrease. On the other hand, the composite layer has good wear resistance when the slurry with proper amount of α-phase was used. In such case, θ-phase (Al<SUB>2</SUB>Cu) acts as an bonding material for the primary intermetallic crystals to form rigid network of hard phases.

Journal

  • Journal of the Japan Institute of Metals and Materials

    Journal of the Japan Institute of Metals and Materials 66(5), 537-542, 2002-05-20

    The Japan Institute of Metals and Materials

References:  24

Codes

  • NII Article ID (NAID)
    10008833268
  • NII NACSIS-CAT ID (NCID)
    AN00062446
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    00214876
  • NDL Article ID
    6179209
  • NDL Source Classification
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL Call No.
    Z17-314
  • Data Source
    CJP  NDL  IR  J-STAGE 
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