High Temperature Creep and Superplasticity in a Mg-Zn-Zr Alloy

查看全文 作　　者：S. [1]Spigarelli;M. El [1]Mehtedi;M. [2]Regev;E. [3]Gariboldi;N. [3]Lecis

机构地区：[1]Dipartimento di Ingegneria Industriale e Scienze Matematiche, Universit Politecnica delle Marche, Via Brecce Bianche, Ancona 60131, Italy;[2]Mechanical Engineering Dept., ORT Braude College, Karmiel 21982, Israel;[3]Dipartimento di Meccanica, Politecnico di Milano, via La Masa 34, 20156 Milano, Italy

出　　处：《Journal of Materials Science & Technology》索引2012年第28卷第5期,共7页

基　　金：partly financially supported by Ort Braude College of Engineering, 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. 关键词：超塑性行为高温蠕变镁合金锆合金温度范围高应变率测试调查晶界滑移

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High Temperature Creep and Superplasticity in a Mg-Zn-Zr Alloy

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