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Effect of recrystallization and grain growth on the mechanical properties of an extruded AZ21 Mg alloy

机译：再结晶和晶粒长大对挤压AZ21 Mg合金力学性能的影响

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摘要

An experimental investigation into the effect of microstructural changes, which occur during post-extrusion annealing of a Mg based AZ21 alloy, on tensile and fatigue properties is conducted. Mechanical properties in the as-cast, as-extruded, and microstructural states that correspond to recovery, recrystallization and grain growth stages of annealing are compared. Results show that these microstructural changes do not alter the yield strength of the alloy markedly whereas significant differences were noted in the ultimate tensile strength as well as ductility. The initiation of abnormal grain growth (or secondary recrystallization) renders the tensile stress-strain response elastic perfectly plastic and results in a large drop in ductility, as high as ～60% during intermediate stages of abnormal grain growth, vis-a-vis the ductility of the as-extruded alloy. While the fatigue performance of all the wrought alloys is far superior to that of the as-cast alloy, as expected, abnormal grain growth leads to a marked decrease in the endurance limit. Possible microscopic origins of these are discussed.
机译：对镁基AZ21合金进行挤压后退火过程中发生的显微组织变化对拉伸性能和疲劳性能的影响进行了实验研究。比较了铸态，挤压态和微观结构状态下的机械性能，这些状态与退火的恢复，再结晶和晶粒生长阶段相对应。结果表明，这些微观结构变化不会明显改变合金的屈服强度，而在极限抗拉强度和延展性方面却存在显着差异。异常晶粒长大（或二次再结晶）的开始使拉伸应力-应变响应具有完美的塑性，并导致延展性大幅度下降，在异常晶粒长大的中间阶段，相对于合金，其延展性高达〜60％。挤压合金的延展性。尽管所有锻造合金的疲劳性能都远胜于铸态合金，但正如预期的那样，异常晶粒长大导致耐久极限明显降低。这些可能的微观起源进行了讨论。

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