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Microstructure, texture, and enhanced mechanical properties of an extruded Mg–rare earth alloy after hot compression

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Abstract

An extruded Mg–8Gd–4Y–1Nd–0.5Zr alloy was preheated at 500 °C for 0.5 h and then subjected to hot compression to a true strain of 0.69 at temperature 450 °C and a strain rate of 0.2 s−1. It is observed that boundaries of small grains (∼3 µm) in the extruded alloy are decorated with irregular-shaped particles; small grains show a weak texture of three main components of \(\left\langle {0001} \right\rangle //{\rm{TD}},\;\left\langle {11\bar 21} \right\rangle //{\rm{ND}}\), and \(\left\langle {10\bar 10} \right\rangle //{\rm{ED}}\). Dynamic recrystallization is concurrent with dynamic precipitation of particles during hot compression, resulting in both a uniform grain structure and a redistribution of particles. The retained particles before compression keep the texture unchanged during compression, leading to the same texture type of \(\left\langle {0001} \right\rangle //{\rm{TD}}\) of the compressed alloy as that of the preheated alloy. The compressed alloy exhibits a better aging hardening ability than the extruded alloy. After peak aging, the compressed alloy presents an ultimate tensile strength of 416 MPa, a yield tensile strength of 317 MPa, and an elongation of 2.7%.

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ACKNOWLEDGMENTS

The authors gratefully acknowledge the financial support from the National Basic Research Program of China (No. A0420110401). The present work was also carried out with the support of the Advanced Characterization Facility in Waurn ponds campus of Deakin University, Geelong, Victoria.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha City, Hunan Province, 410083, People’s Republic of China

    Yi Ping Wu, Xin Ming Zhang, Yun Lai Deng & Chang Ping Tang

  2. Institute for Frontier Materials, Geelong Technology Precinct, Deakin University, Geelong, Victoria, 3220, Australia

    Yi Ping Wu

  3. The Key Laboratory of Nonferrous Metal Materials Science and Engineering, Central South University, Changsha City, Hunan Province, 410083, People’s Republic of China

    Xin Ming Zhang, Yun Lai Deng & Chang Ping Tang

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  1. Yi Ping Wu
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  2. Xin Ming Zhang
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Correspondence to Yi Ping Wu.

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Wu, Y.P., Zhang, X.M., Deng, Y.L. et al. Microstructure, texture, and enhanced mechanical properties of an extruded Mg–rare earth alloy after hot compression. Journal of Materials Research 30, 3776–3783 (2015). https://doi.org/10.1557/jmr.2015.362

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