作者：李英杰 张秀芝 陈立佳 李峰

　　摘 要:文章通过在不同温度和不同应变速率条件下进行拉伸实验,研究了实验温度和应变速率对经不同道次和路径等通道转角挤压的Mg-Zn-Nd合金超塑变形行为的影响。流变应力与应变速率结果表明,经过4道次C等通道转角挤压后Mg-Zn-Nd镁合金的延伸率最好;流变应力与实验温度的关系则表明,经过等通道转角挤压后Mg-Zn-Nd镁合金的超塑变形机制应为晶界扩散控制的晶界滑移。
　　关键词:等通道转角挤压;实验;镁合金
　　Abstract: In this paper, the influence of temperature and strain rate on the superplastic deformation behaviors of the ECAPed Mg-Zn-Nd alloy has been investigated by performing tensile tests at different temperatures and strain rates. It is showed that After 4 passes of ECAP by route C, the elongation of Mg-Zn-Nd alloy reached 381.8% at 300℃, indicating that the ECAPed Mg-Zn-Nd alloy exhibited a good superplasticity. The curves of stress vs. temperature indicate that for the Mg-Zn-Nd alloy processed by ECAP, the dominant mechanism during superplastic deformation is grain boundary sliding controlled by grain boundary diffusio

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