Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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The softening behavior of Mg-Li-Al(-Zr) alloys

Mg-Li-Al(-Zr) 합금의 연화현상

  • Kim, Y.W. (Department of Metallugical Eng., Yonsei University) ;
  • Kwang, Y.H. (Department of Metallugical Eng., Yonsei University) ;
  • Lim, Y.J. (Agency for Defence Development) ;
  • Kim, D.H. (Department of Metallugical Eng., Yonsei University) ;
  • Hong, C.P. (Department of Metallugical Eng., Yonsei University)
  • Published : 1998.03.31
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Abstract

The softening behavior of squeeze cast Mg-Li-Al and Mg-Li-Al-Zr alloys have been investigated. The highest hardness values of Mg-Li-Al and Mg-Li-Al-Zr alloys were obtained after solution treatment at $400^{\circ}C$ for 1 hour. The hardness value, however, decreased as the aging temperature and time increased. Microstructural and calorometric analyses showed that quenched-microstructure changed from primary (${\alpha}$ and ${\beta}$)+secondary ${\alpha}$ to primary(${\alpha}$ and ${\beta}$)+secondary ${\alpha}+{\theta}$ after aging. The softening during aging was due to the coarsening of ${\theta}$ precipitates.

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Acknowledgement

Supported by : 국방과학연구소