Changes in Microstructure and Mechanical Properties during Solid Sintering of Ni-Al Mixed Powder Compact

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著者

    • MATSUURA Kiyotaka
    • Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
    • KITAMURA Toshiki
    • Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
    • KUDOH Masayuki
    • Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
    • ITOH Youichi
    • Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University

抄録

Low temperature reactive sintering of Ni–Al mixed powder compact is performed, and the effects of temperature, time and pressure of sintering on the microstructure, density, hardness and ductility of the compact at room temperature are investigated. During sintering, intermetallic phases and pores are formed and grow. The growth of the former increases the hardness of the compact, while the growth of the latter reduces the density. The volume fraction of aluminum phase decreases in accordance with the parabolic law, and the parabolic rate constant is described as<BR><B>k</B>=3000exp(−60400<B>R</B><SUP>−1</SUP><B>T</B><SUP>−1</SUP>)<BR>where <B>R</B> and <B>T</B> are the gas constant and absolute temperature. The ductility of the compact, evaluated by the critical rolling reduction, dramatically increases by short sintering and then gradually decreases with sintering time. The increase in the ductility is caused by the diffusion junction at the interface between powder particles, while the decrease by the formation of intermetallic compound phases at the interface. Application of pressure to the compact during sintering brings about remarkable increase in the density and hardness of the compact.

収録刊行物

  • Materials transactions, JIM  

    Materials transactions, JIM 37(5), 1067-1072, 1996-05 

    The Japan Institute of Metals

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各種コード

  • NII論文ID(NAID)
    10002449365
  • NII書誌ID(NCID)
    AA10699969
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    09161821
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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