High Temperature Creep and Superplasticity in a Mg-Zn-Zr Alloy
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2012年第5期
论文作者：S. Spigarelli M. El Mehtedi M. Regev
文章页码：407 - 413
摘 要：Creep and superplasticity were investigated by testing a fine-grained extruded Mg-Zn-Zr magnesium alloy under a wide range of applied stress in the temperature range between 100 and 300 ℃. Grain boundary sliding became the dominating mechanism at 200 ℃, leading to a true superplastic behaviour at 300 ℃, where superplasticity was attained even under relatively high strain rates （5×10-3 s-1 ）. By contrast, for lower temperatures, the straining process was controlled by dislocation climb. A comprehensive model, taking into account the simultaneous operation of the different mechanisms, was developed to describe the strain rate dependence on applied stress.
S. Spigarelli1，M. El Mehtedi1，M. Regev2
1. Dipartimento di Ingegneria Industriale e Scienze Matematiche, Universit Politecnica delle Marche, Via Brecce Bianche, Ancona 60131, Italy2. Mechanical Engineering Dept., ORT Braude College, Karmiel 21982, Israel
摘 要：Creep and superplasticity were investigated by testing a fine-grained extruded Mg-Zn-Zr magnesium alloy under a wide range of applied stress in the temperature range between 100 and 300 ℃. Grain boundary sliding became the dominating mechanism at 200 ℃, leading to a true superplastic behaviour at 300 ℃, where superplasticity was attained even under relatively high strain rates （5×10-3 s-1 ）. By contrast, for lower temperatures, the straining process was controlled by dislocation climb. A comprehensive model, taking into account the simultaneous operation of the different mechanisms, was developed to describe the strain rate dependence on applied stress.
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