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

作者：Spigarelli S^*; El Mehtedi M; Regev M; Gariboldi E; Lecis N

来源：Journal of Materials Science & Technology, 2012, 28(5): 407-413.

• Creep
• Superplasticity
• Magnesium alloy

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 degrees C. Grain boundary sliding became the dominating mechanism at 200 degrees C, leading to a true superplastic behaviour at 300 degrees C, where superplasticity was attained even under relatively high strain rates (5x10(-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.

• 出版日期2012-5