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Deformation Mechanism and Microstructural Evolution of a Mg–Y–Nd–Zr Alloy under High Strain Rate at Room Temperature

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Abstract

The effect of strain rate on the microstructure and deformation mechanism of a Mg–Y–Nd–Zr alloy was studied. The microstructure and texture were examined by optical microscopy and electron backscatter diffraction, and the dislocation structures were observed by transmission electron microscopy. The results showed that the Mg–Y–Nd–Zr alloy exhibited positive strain rate sensitivity under high-strain-rate compression. At a strain rate of 830 s−1, many grains were re-oriented owing to the formation of a large number of tensile twins in the specimen. With increasing strain rate, the number of extension twins decreased, but those of contraction twins, double twins, and < c + a > dislocations increased. The dominant deformation mechanism of the material changed from extension twin-dominated deformation to extension twin- and < c + a > slip-dominated deformation.

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Acknowledgments

This work was supported by National Natural Science Foundation of China (51661007), Guizhou University cultivation project [2019] 15, central government guide local science and technology development special projects [2019] 4011.

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Authors and Affiliations

  1. College of Material and Metallurgy, Guizhou University, Guiyang, 550025, China

    Guisheng Deng, Wei Li, Guoqi Chang & Yuandong Liu

  2. Guizhou Key Laboratory for Mechanical Behaviour and Microstructure of Materials, Guizhou University, Guiyang, China

    Guisheng Deng, Wei Li, Guoqi Chang & Yuandong Liu

  3. National and Local Joint Engineering Laboratory for High-Performance Metal Structure Material and Advanced Manufacturing Technology, Guiyang, China

    Guisheng Deng, Wei Li, Guoqi Chang & Yuandong Liu

  4. Guizhou Aerospace Xinli Technology Co., Ltd, Zunyi, China

    Aiwen Li

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  1. Guisheng Deng
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GD Writing – original draft. AL Investigation. WL Writing – review & editing, Supervision. GC Software. YL Visualization.

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Correspondence to Wei Li.

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Deng, G., Li, A., Li, W. et al. Deformation Mechanism and Microstructural Evolution of a Mg–Y–Nd–Zr Alloy under High Strain Rate at Room Temperature. J. of Materi Eng and Perform 33, 3101–3114 (2024). https://doi.org/10.1007/s11665-023-08192-x

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