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首页> 外文期刊>Materials Science and Engineering >Effects of texture and stress sequence on twinning, detwinning and fatigue crack initiation in extruded magnesium alloy AZ31
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Effects of texture and stress sequence on twinning, detwinning and fatigue crack initiation in extruded magnesium alloy AZ31

机译：挤压镁合金AZ31中纹理和应力序列对骨质，扦插和疲劳裂纹引发的影响

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摘要

Several types of cyclic stress were applied to specimens made of an extruded magnesium alloy, AZ31, to elucidate twinning, detwinning, and fatigue crack initiation mechanisms by electron backscattered diffraction analysis. In both the texture and the random orientation, twinning occurred under compressive stress exceeding the compressive yield strength. Detwinning occurred only in the texture upon the subsequent application of tensile stress less than the tensile yield strength of monotonic loading, whereas detwinning did not occur in the structure with random orientation. Under compression-compression fatigue test, successive twinning occurred, which changed the orientation of the basal plane. As a result, the random orientation of grains changed to the texture in which the normal of the basal plane was parallel to the loading direction. Cracks were formed along the boundary of grains with a high Schmid factor of the basal slip system and the misfit of grain on both sides was large. Near the crack initiation site, twin bands were observed; however, detwinning did not occur under the tensile stress after the cyclic compression loading.
机译：将几种类型的循环应力应用于由挤出的镁合金，AZ31制成的标本，以通过电子反向散射衍射分析来阐明孪晶，脱绒和疲劳裂纹引发机制。在纹理和随机取向中，孪生发生在压缩应力下超过压缩屈服强度。在随后施加的抗拉应力小于单调负载的拉伸屈服强度时，脱绒仅发生在质地上，而碎屑在具有随机取向的结构中没有发生。在压缩压缩疲劳试验下，发生连续的孪晶，改变了基础平面的取向。结果，晶粒的随机取向变为纹理，其中基平面的法线平行于装载方向。沿着基底滑动系统的高施联粒的晶粒边界形成裂缝，两侧的谷物的错量大。靠近裂纹启动部位，观察到双带;然而，在环状压缩负载后的拉伸应力下没有发生脱绒。

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