Journal of Mechanical Science and Technology

  • 제20권8호
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  • Pages.1209-1216
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  • 2006
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  • 1738-494X(pISSN)
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  • 1976-3824(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
권호 표지

Elevated Temperature Deformation Behavior in an AZ31 Magnesium Alloy

  • Yang Kyoung-Tak (Department of Automotive Engineering, Graduate School, Seoul National University of Technology) ;
  • Kim Ho-Kyung (Department of Automotive Engineering, Seoul National University of Technology)
  • 발행 : 2006.08.01
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⟨ 이전 논문 다음 논문 ⟩

초록

An AZ31 magnesium alloy was tested at constant temperatures ranging from 423 to 473 K (0.46 to 0.51 Tm) under constant stresses. All of the creep curves exhibited two types depending on stress levels. At low stress (${\sigma}/ G < 4 {\times}10^{-3}$), the creep curve was typical of class A (Alloy type) behavior. However, at high stresses (${\sigma}/ G > 4 {\times}10^{-3}$), the creep curve was typical of class M (Metal type) behavior. At low stress level, the stress exponent for the steady-state creep rate was of 3.5 and the true activation energy for creep was 101 kJ/mole which is close to that for solute diffusion. It indicates that the dominant deformation mechanism was glide-controlled dislocation creep. At low stress level where n=3.5, the present results are in good agreement with the prediction of Fridel model.

키워드

참고문헌

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