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Effect of Heat Treatment on Microstructure and Mechanical Properties of Extruded Mg-4Zn-1.5Al-2Sn Alloy

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Abstract

The microstructure and mechanical properties of extruded Mg-4Zn-1.5Al-2Sn (ZAT422) alloy under different heat treatments were investigated by optical microscopy, scanning electron microscopy, x-ray diffraction, transmission electron microscopy, micro-hardness tests, and tensile tests. The results show that the as-extruded and heat-treated ZAT422 alloys mainly consisted of α-Mg and Mg2Sn, and no ternary phase was detected. After aging, the amount of secondary phase precipitates increased significantly and the mechanical properties were improved. Among all the heat treatments, T5 heat treatment at 150 °C for 25 h resulted in the best combination of strength and ductility for ZAT422 alloy. The ultimate tensile strength, yield strength, and elongation (εf) were found to be 290, 182 MPa, and 20%, respectively. Based on microstructural characterization, the variations in mechanical properties of the alloy subjected to heat treatment were analyzed in detail.

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Acknowledgment

The authors would like to thank the financial supports from the National Key R&D Program of China (2016YFB0301100), National Natural Science Foundation of China (Projects 51571043, 51675533 and 51701238), and Fundamental Research Funds for the Central Universities (2018CDJDCL0019 and cqu2018CDHB1A08).

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Authors and Affiliations

  1. National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing, 100072, People’s Republic of China

    Bo Wang, Shicheng Wei, Wei Huang, Yuajiang Wang, Yi Liang & Binshi Xu

  2. College of Materials Science and Engineering, Chongqing University, Chongqing, 400045, People’s Republic of China

    Xianhua Chen & Fusheng Pan

  3. Chongqing Academy of Science and Technology, Chongqing, 401123, China

    Xianhua Chen & Renju Cheng

  4. Department of Mechanical Engineering Technology, Purdue University, West Lafayette, IN, 47906, USA

    Jianyue Zhang

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  1. Bo Wang
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Correspondence to Xianhua Chen.

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Wang, B., Chen, X., Wei, S. et al. Effect of Heat Treatment on Microstructure and Mechanical Properties of Extruded Mg-4Zn-1.5Al-2Sn Alloy. J. of Materi Eng and Perform 28, 4565–4573 (2019). https://doi.org/10.1007/s11665-019-04258-x

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  • DOI: https://doi.org/10.1007/s11665-019-04258-x

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