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首页> 美国卫生研究院文献>Materials >Ratcheting Strain and Microstructure Evolution of AZ31B Magnesium Alloy under a Tensile-Tensile Cyclic Loading
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Ratcheting Strain and Microstructure Evolution of AZ31B Magnesium Alloy under a Tensile-Tensile Cyclic Loading

机译：拉伸拉伸循环载荷下AZ31B镁合金的棘轮应变和组织演变

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摘要

In this paper, studies were conducted to investigate the deformation behavior and microstructure change in a hot-rolled AZ31B magnesium alloy during a tensile-tensile cyclic loading. The relationship between ratcheting effect and microstructure change was discussed. The ratcheting effect in the material during current tensile-tensile fatigue loading exceeds the material’s fatigue limit and the development of ratcheting strain in the material experienced three stages: initial sharp increase stage (Stage I); steady stage (Stage II); and final abrupt increase stage (Stage III). Microstructure changes in Stage I and Stage II are mainly caused by activation of basal slip system. The Extra Geometrically Necessary Dislocations (GNDs) were also calculated to discuss the relationship between the dislocation caused by the basal slip system and the ratcheting strain during the cyclic loading. In Stage III, both the basal slip and the {11−20} twins are found active during the crack propagation. The fatigue crack initiation in the AZ31B magnesium alloy is found due to the basal slip and the {11−20} tensile twins.
机译：在本文中，进行了研究以研究热轧AZ31B镁合金在拉伸拉伸循环载荷下的变形行为和微观组织变化。讨论了棘轮效应与组织变化之间的关系。当前拉伸拉伸疲劳载荷下材料的棘轮效应超过了材料的疲劳极限，并且材料中的棘轮应变发展经历了三个阶段：初始急剧增加阶段（第一阶段）；稳定阶段（第二阶段）；最后的突然增加阶段（第三阶段）。第一阶段和第二阶段的微观结构变化主要是由于基底滑动系统的激活引起的。还计算了额外的几何必要位错（GND），以讨论在循环载荷过程中基底滑移系统引起的位错与棘轮应变之间的关系。在阶段III中，发现基体滑动和{11-20}孪晶在裂纹扩展过程中都处于活动状态。 AZ31B镁合金的疲劳裂纹萌生是由于基底滑移和{11-20}拉伸孪晶引起的。

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