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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure and Deformation Mechanism of AZ31 Magnesium Alloy Under Dynamic Strain Rate
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Microstructure and Deformation Mechanism of AZ31 Magnesium Alloy Under Dynamic Strain Rate

机译：AZ31镁合金动态应变率下的微观结构和变形机理

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摘要

A hot-rolled AZ31Mg alloy sheet was subjected to dynamic plastic deformation parallel to the rolling direction, and microstructural evolutions and mechanical properties of the deformed samples were examined. It has been found that dynamic strain rate could facilitate {10-12} twin nucleation and growth and leads to a lower yield stress of about 20MPa and an early end to twinning characteristic (happening at a strain point of about 6%) shown in the stress-strain curve. {10-12} twinning mechanism dominates the early plastic deformation; but when plastic strain exceeds similar to 9%, dislocation-slip mechanism instead of {10-12} twinning dominates the later plastic deformation. And this premature transformation of the dominant deformation mechanisms from {10-12} twinning to dislocation slip is caused by dynamic strain rate. The effect of dynamic strain rate on the number of twin nucleations remains unclear, and the more systematic researches are needed in the future.
机译：对热轧AZ31mg合金片进行动态塑性变形，平行于轧制方向，并检查变形样品的微观结构演进和机械性能。 已经发现，动态应变率可以促进{10-12}的细成核和生长，并导致屈服应力约为20MPa，并且在孪生特性（发生在约6％的菌株点）中的早期末端 应力 - 应变曲线。 {10-12}孪晶机制主导了早期塑性变形; 但是，当塑性应变超过类似于9％时，脱位滑移机制而不是{10-12}孪生占据塑性变形。 并且，从{10-12}孪晶到位错滑移的主要变形机制过早改变是由动态应变速率引起的。 动态应变率对双胞胎成核数量的影响尚不清楚，未来需要更系统的研究。

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