AZ31镁合金多向加载过程中{10-12}-{10-12}-{10-12}三次孪晶行为研究

谭力; 闫玉芹; 阳圣; 文彦涵; 程仁菊; 周浩

doi:10.3969/j.issn.1674-6457.2026.01.002

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精密成形工程 ›› 2026, Vol. 18 ›› Issue (1) : 14-25. DOI: 10.3969/j.issn.1674-6457.2026.01.002

轻合金成形

AZ31镁合金多向加载过程中{10-12}-{10-12}-{10-12}三次孪晶行为研究

谭力¹, 闫玉芹¹, 阳圣¹, 文彦涵¹, 程仁菊^1,*, 周浩²

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Behavior of {10-12}-{10-12}-{10-12} Triple Twin during Multi-directional Loading of AZ31 Magnesium Alloy

TAN Li¹, YAN Yuqin¹, YANG Sheng¹, WEN Yanhan¹, CHENG Renju^1,*, ZHOU Hao²

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摘要

目的了解多向加载过程中{10-12}-{10-12}-{10-12}三次孪晶激活情况,研究{10-12}-{10-12}-{10-12}三次孪晶的产生及生长机制。方法以AZ31镁合金为实验对象,在室温条件下,沿着试样轧向（Rolling Direction,RD）、径向（Transverse Direction,TD）和法向（Normal Direction,ND）以6%应变幅值进行RD-TD-ND路径下的三向压缩加载试验,采用准原位电子背散射衍射（Electron Backscatter Diffraction,EBSD）技术手段,对多向压缩过程中同一区域显微组织进行分析。结果沿RD-TD-ND方向三向压缩加载后,材料内部有{10-12}-{10-12}-{10-12}三次孪晶的生成,通过对其Schmid因子（SF）进行分析计算,发现这种三次孪晶的SF值很低甚至为负值,其产生不能完全用施密特定律解释,因此提出并讨论了三次孪晶的可能形成机制。结论三次孪晶在二次孪晶{10-12}-{10-12}内被激活,对其取向校正后发现,这种三次孪晶为{10-12}-{10-12}-{10-12}三次孪晶,其产生不满足Schmid定律,利用几何应变协调因子（m′）计算分析发现,{10-12}-{10-12}-{10-12}三次孪晶是为了协调{10-12}-{10-12}二次拉伸孪晶中位错滑移在二次孪晶边界处所造成的应力集中而产生的。

Abstract

In order to understand the activation of {10-12}-{10-12}-{10-12} triple twin during multi-directional loading, the work aims to study the generation and growth mechanism of {10-12}-{10-12}-{10-12} triple twin. With AZ31 magnesium alloy as the experimental object, the three-way compressive loading was carried out along the rolling direction (RD), radial direction (TD) and normal direction (ND) of the sample at 6% strain amplitude at room temperature, and the quasi-in-situ electron backscatter diffraction (EBSD) technique was used to analyze the microstructure of the same region during multi-directional compression. It was found that the {10-12}-{10-12}-{10-12} triple twin formed in the material after three-way compressive loading along the RD-TD-ND direction, and the Schmid factor (SF) was analyzed and calculated. It was found that the SF value of this triple twin was low or even negative and the formation of the triple twin could not be fully explained by Schmid's law. Therefore, the possible formation mechanism of the triple twin was proposed and discussed. It is concluded that the triple twin is activated in the {10-12}-{10-12} secondary twin, and after its orientation correction, it is found that the triple twin type is {10-12}-{10-12}-{10-12} triple twin, and the generation of this triple twin does not satisfy Schmid's law. Through calculation and analysis with the geometric strain compatibility factor (m'), it is revealed that the {10-12}-{10-12}-{10-12} triple twin is generated to accommodate stress concentration at secondary twin boundaries caused by dislocation slip within the {10-12}-{10-12} secondary tensile twin.

导出引用

谭力, 闫玉芹, 阳圣, 文彦涵, 程仁菊, 周浩. AZ31镁合金多向加载过程中{10-12}-{10-12}-{10-12}三次孪晶行为研究[J]. 精密成形工程. 2026, 18(1): 14-25 https://doi.org/10.3969/j.issn.1674-6457.2026.01.002

TAN Li, YAN Yuqin, YANG Sheng, WEN Yanhan, CHENG Renju, ZHOU Hao. Behavior of {10-12}-{10-12}-{10-12} Triple Twin during Multi-directional Loading of AZ31 Magnesium Alloy[J]. Journal of Netshape Forming Engineering. 2026, 18(1): 14-25 https://doi.org/10.3969/j.issn.1674-6457.2026.01.002

中图分类号： TG146.2+2

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