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Effect of Deformation Conditions on Dynamic Mechanical Behavior of a Mg–Gd-Based Alloy

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Abstract

The effect of the deformation temperature and strain rate on the dynamic mechanical behavior of an extruded Mg-8Gd-4Y-Nd-Zr alloy plate is investigated using optical microscopy, scanning electron microscopy, x-ray diffraction and the split Hopkinson pressure bar methods. The alloy exhibits excellent dynamic compressive strength both at room temperature and high temperatures. The compressive strength of the alloy can reach 569 MPa, 635 MPa and 567 MPa at the deformation conditions of room temperature/2317 s−1, 200°C/1659 s−1, and 300°C/1581 s−1, respectively. The excellent mechanical properties of the alloy at different temperatures are mainly due to the stable rare earth-rich particles and the dynamic precipitates formed at the grain boundaries during compression. Cleavage planes and dimples are the main features of the fracture surface. The number of dimples increases as the deformation temperature increases, while the proportion of cleavage planes decreases with increasing temperature. However, the fracture characteristics are distinct in different regions. A large number of cleavage surfaces can also be observed in certain areas, where the cleavage cracks are easy to propagate, even if the sample is compressed at elevated temperatures.

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Acknowledgements

The authors would like to appreciate the financial supports from National Natural Science Foundation of China (Grant Nos. 52075167, 51605159, 52071139 and 51601062), Hunan Provincial Natural Science Foundation of China (Grant No. 2020JJ4307 and 2016JJ5042), and Excellent Youth Project of Hunan Provincial Department of Education (Grant No. 19B214).

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Authors and Affiliations

  1. High Temperature Wear Resistant Materials and Preparation Technology of Hunan Province National Defence Science and Technology Laboratory, Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion, School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan, 411201, People’s Republic of China

    Changping Tang, Xuezhao Wang, Wenhui Liu, Guoliang Zuo, Dong Li, Xiaoyuan Li & Xiao Liu

  2. Department of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, People’s Republic of China

    Di Feng

  3. School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, People’s Republic of China

    Xu Chen

  4. Chongqing Academy of Science and Technology, Chongqing, 401123, People’s Republic of China

    Quan Li

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  1. Changping Tang
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  2. Xuezhao Wang
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Correspondence to Changping Tang or Wenhui Liu.

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Tang, C., Wang, X., Liu, W. et al. Effect of Deformation Conditions on Dynamic Mechanical Behavior of a Mg–Gd-Based Alloy. J. of Materi Eng and Perform 29, 8414–8421 (2020). https://doi.org/10.1007/s11665-020-05274-y

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  • DOI: https://doi.org/10.1007/s11665-020-05274-y

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