采用Gleebe-1500热/力模拟机研究了Mg-5.6Zn-0.7Zr-0.8Nd合金在应变速率为0.1,0.01和0.002 s-1、变形温度为373-673 K、最大变形程度60%条件下的高温塑性变形行为.分析了合金流变应力与应变速率、变形温度之间的关系,计算了高温变形时变形激活能和应力指数,并观察了合金变形过程中显微组织变化情况.结果表明:Mg-5.6Zn-0.7Zr-0.8Nd合金在热变形过程中不同温度下流变应力呈现不同形式,分析可知加工硬化、动态回复和动态再结晶在不同温度和不同应变速率下各自起到了重要的作用,合金变形激活能随应变速率增加而升高.在473 K温度以上变形,合金发生明显动态再结晶且动态再结晶晶粒非常细小,晶粒尺寸为5-10 μm,从而可明显提高合金的塑性.
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