The Effect of Microstructure Evolution on the Elevated Temperature Mechanical Properties in Mg-Sn-Ca System

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  • Kim Do Hyung
    Center for Noncrystalline Materials, Dept. of Metallurgical Eng., Yonsei University
  • Lee Ju Youn
    Center for Noncrystalline Materials, Dept. of Metallurgical Eng., Yonsei University
  • Lim Hyun Kyu
    Center for Noncrystalline Materials, Dept. of Metallurgical Eng., Yonsei University
  • Kyeong Joon Seok
    Center for Noncrystalline Materials, Dept. of Metallurgical Eng., Yonsei University
  • Kim Won Tae
    Applied Science Division, Cheongju University
  • Kim Do Hyang
    Center for Noncrystalline Materials, Dept. of Metallurgical Eng., Yonsei University

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Abstract

The effect of microstructural evolution on the creep properties in Mg-Sn-Ca system has been investigated. As-cast microstructure of Mg-Sn-Ca alloy consists of two or three phases depending on the Ca/Sn ratio, i.e. Mg2Sn, CaMgSn and Mg2Ca phases. Ternary CaMgSn phase has two types of morphology by its pseudo hyper-eutectic reaction with α-Mg; coarse rod-like primary or feather-like eutectic phase. Primary solidified CaMgSn phase exhibit negative effect on the tensile properties in spite of its high thermal stability up to 500°C. According to the creep test results, apparent stress exponent value (n=7) indicates climb controlled creep mechanism by core diffusion above 150°C. Activation energy of Mg-5Sn-2Ca alloy (74 kJ/mol) is close to grain boundary diffusion for pure magnesium, 92 kJ/mol. Creep resistance is remarkably improved with the presence of Mg2Ca phase.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 49 (10), 2405-2413, 2008

    The Japan Institute of Metals and Materials

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