| 1 | High Temperature Creep and Superplasticity in a Mg-Zn-Zr Alloy显示文摘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. Spigarelli M. El Mehtedi M. Regev E. Gariboldi N. Lecis | 2012 | Journal of Materials Science & Technology2012，28，5： | 3 |
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