Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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High temperature deformation behavior of Sc and Misch metal added Al-Mg alloys

Sc과 Misch Metal을 첨가한 Al-Mg 합금의 고온 변형 거동

  • Woo, K.D. (Division, of Advanced Materials Engineering and the Research Center of Advanced Materials, Engineering of Research Institute at Chonbuk National University) ;
  • Rhy, Y.S. (Division, of Advanced Materials Engineering and the Research Center of Advanced Materials, Engineering of Research Institute at Chonbuk National University) ;
  • Kim, S.W. (Division, of Advanced Materials Engineering and the Research Center of Advanced Materials, Engineering of Research Institute at Chonbuk National University) ;
  • Kim, D.G. (Division, of Advanced Materials Engineering and the Research Center of Advanced Materials, Engineering of Research Institute at Chonbuk National University) ;
  • Yang, C.H. (Cubictek Co. Ltd.)
  • 우기도 (전북대학교 신소재공학부, 신소재개발연구센터) ;
  • 유용석 (전북대학교 신소재공학부, 신소재개발연구센터) ;
  • 김석원 (전북대학교 신소재공학부, 신소재개발연구센터) ;
  • 김동건 (전북대학교 신소재공학부, 신소재개발연구센터) ;
  • 양창호 ((주)큐빅테크)
  • Received : 2003.11.18
  • Published : 2004.01.30
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Abstract

In this work, the effect of Sc and Mm(misch metal) on the high temperature behavior of Al-Mg alloys was observed. Hardness was increased due to appearance of fine $Al_3Sc$ precipitates. The elongation of Al-Mg-Sc alloy at high temperature was higher than that of Al-Mg-Sc-Mm alloy because Al-Mg-Sc alloy has finer grain sizes than Al-Mg-Sc-Mm alloy. The strain rate sensitivity factor, "m" of Al-Mg-Sc and Al-Mg-Sc-Mm at $475^{\circ}C$ and $1{\times}10^{-2}s^{-1}$ were 0.33 and 0.46, respectively. The activation energy of Al-Mg-Sc and Al-Mg-Sc-Mm alloy for superplastic deformation was 133KJ/mol and 103KJ/mol respectively. The elongation of Al-Mg-Sc alloy at high temperature was decreased by the addition of Mm, but the strength at high temperatures and low strain rate was improved.

Keywords

Acknowledgement

Supported by : 전북대학교

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