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Importance of diffusional creep in fine grained Mg-3Al-1Zn alloys

机译：Mg-3Al-1Zn细晶粒合金中扩散蠕变的重要性

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摘要

Deformation mechanisms of fine-grained Mg-3Al-Zn (AZ31) alloys that were prepared by using severe plastic deformation were identified at elevated temperatures between 473 K and 573 K by examining their stress-strain rate relations at different grain sizes and temperatures. Unlike the previous reports where grain boundary sliding has been suggested to be the rate-controlling deformation mechanism in the fine-grained AZ31 alloy, the current analysis indicated that Coble creep competes with grain boundary sliding and the contribution of Coble creep to overall strain rate increases as grain size decreases and temperature increases. Making the efforts to minimize grain growth during sample heating and tensile deformation is, however, important for observing Coble creep. Texture variation took place during the tensile deformation and differed depending on the type of dominant deformation mechanism operating under the given testing condition.
机译：通过检查在不同晶粒度和温度下的应力-应变率关系，在473 K和573 K之间的高温下，确定了通过严重塑性变形制备的Mg-3Al-Zn（AZ31）细晶粒合金的变形机制。与先前的报告认为晶界滑动是细晶粒AZ31合金中的速率控制形变机理的报告不同，当前的分析表明，Coble蠕变与晶界滑动竞争，并且Coble蠕变对整体应变率的贡献增加随着晶粒尺寸的减小和温度的升高。但是，要努力使样品加热和拉伸变形过程中的晶粒生长最小化，对于观察Coble蠕变非常重要。纹理变化发生在拉伸变形过程中，并且根据在给定测试条件下运行的主要变形机制的类型而不同。

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