The role of {10–12} tensile twinning in plastic deformation and fracture prevention of magnesium alloys

晶体孪晶 材料科学 极限抗拉强度 打滑(空气动力学) 镁合金 可塑性 相容性(地球化学) 成形性 冶金 复合材料 微观结构 热力学 物理
作者
Jia-fei Deng,Jing Tian,Yuanying Chang,Yancai Zhou,Wei Liang,Jinyao Ma
出处
期刊:Materials Science and Engineering A-structural Materials Properties Microstructure and Processing [Elsevier BV]
卷期号:853: 143678-143678 被引量:36
标识
DOI:10.1016/j.msea.2022.143678
摘要

To improve the formability of magnesium alloy sheets, {10–12} tensile twins can be used to improve the plastic deformation ability of magnesium alloys at room temperature. In this paper, through the quasi-in-situ study of the AZ31B magnesium alloy samples prepared with {10–12} tensile twins during the uniaxial tensile process, the mechanism of tensile twinning to improve the plastic forming of magnesium alloys is further explored. The results show that the variant selection behavior of the tensile twin usually exhibits Schmid behavior, but sometimes non Schmid behavior, which leads to the change of the matrix grain orientation and the activation of the pyramidal II < c+a > slip more easily. Strain compatibility is the main factor affecting the variant selection behavior of transgranular twins, while the activation of the pyramidal II < c+a > slip of the matrix is almost geometric compatibility. The pyramidal II < c+a > slip is easily activated inside the twin, and its activation is determined by the strain compatibility between adjacent grains. Microcracks propagate along the grain boundaries with poor strain compatibility. Tensile twinning can coordinate the slip between adjacent grains and the strain transfer between twins, improve the strain compatibility between adjacent grains, and reduce microcrack propagation.
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