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Achieving Superplasticity in AZ31 Magnesium Alloy Processed by Hot Extrusion and Rolling

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Abstract

Experiments were conducted on ultrafine-grained AZ31 magnesium alloy sheet which was prepared through nano-grained powders processed by hot extrusion at 300 °C plus hot-rolling for four passes at 200. The superplastic behavior had been evaluated in a low-temperature range of 423-523 K and strain rates varied from 5 × 10−4 to 5 × 10−3 s−1. The experiment results showed that tensile testing revealed the superplastic elongations with a maximum measured elongation of 227% when tested at 523 K and strain rate of 5 × 10−4 s−1. The superplastic deformation behavior was attributed to the ultrafine-grained microstructures. The measured elongations mainly depended upon the initial strain rate and temperature, and the strain rate sensitivity m was ~0.5 for this condition. The results indicated that powder metallurgy and subsequent hot extrusion plus rolling were promising approaches to produce the ultrafine-grained magnesium alloy sheet with superplasticity.

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Acknowledgment

This work was supported by the Opening Project of Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology (ASMA201416), and Scientific Foundation of Nanjing Institute of Technology (YKJ201403).

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Authors and Affiliations

  1. Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing, 211167, China

    Xin Wang & Mengling Wu

  2. School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing, 211167, China

    Xin Wang, Mengling Wu, Wenliang Ma, Yi Lu & Shuai Yuan

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  1. Xin Wang
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  2. Mengling Wu
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Correspondence to Xin Wang.

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Wang, X., Wu, M., Ma, W. et al. Achieving Superplasticity in AZ31 Magnesium Alloy Processed by Hot Extrusion and Rolling. J. of Materi Eng and Perform 25, 64–67 (2016). https://doi.org/10.1007/s11665-015-1826-1

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  • DOI: https://doi.org/10.1007/s11665-015-1826-1

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