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

TAN Li; YAN Yuqin; YANG Sheng; WEN Yanhan; CHENG Renju; ZHOU Hao

doi:10.3969/j.issn.1674-6457.2026.01.002

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (1) : 14-25. DOI: 10.3969/j.issn.1674-6457.2026.01.002

Light Alloy Forming

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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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.

Key words

AZ31 magnesium alloy / multi-directional loading / {10-12}-{10-12}-{10-12} triple twin / local strain accommodation

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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

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Funding

Science and Technology Research Program of Chongqing Municipal Education Commission (KJQN202201160, KJZD-K202201108); Cultivation Plan of Scientific Research and Innovation Team of Chongqing University of Technology (2023TDZ010)