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Microstructure, mechanical properties, and texture evolution of Mg–Zn–Y–Zr alloy fabricated by hot extrusion–shearing process

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Abstract

In this study, ultrafine-grained Mg–Zn–Y–Zr alloys were obtained via a novel extrusion–shearing (ES) deformation process, which combined initial forward extrusion with subsequent shearing. The experimental results showed that the composition of the main phase was converted from the α-Mg, I (Mg3Zn6Y), and W (Mg3Zn3Y2) phases to the α-Mg and W phases as the Zn/Y mass ratio of the as-cast alloys decreased from 4 to 0.67. Needle-shaped YZn5 and micron-sized Mg7Zn3 phases were also observed in the as-homogenized Mg–4Zn–1Y–0.6Zr and Mg–3Zn–2Y–0.6Zr alloys. The quantitative electron backscatter diffraction results demonstrated that the dynamic recrystallization (DRX) and the growth of fine DRX grains had a strong dependence on the equivalent strain and increased temperature caused by the die corner. The abundance of W precipitates resulted in the gradual evolution of the sub-grains into fresh DRX grains for the ES alloy III. Additionally, reduced strength anisotropies were related to the decreased pole density caused by the increasing addition of Y; a weakened basal texture with a rare-earth texture component was also achieved at 3 wt% of Y addition. Finally, the influences of the grain size and basal texture on the ductility and strength of the ES alloys were systematically investigated.

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Acknowledgements

This research was supported by “Xingliao Elite” Project of Liaoning Province (XLYC1807021), Youth Project of Liaoning Education Department (LQGD2017032), National Natural Science Foundation (51504153), and Innovation Talent Program in Sciences and Technologies for Young and Middle-aged Scientists of Shenyang (RC180111).

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  1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, People’s Republic of China

    Shuai Dai, Feng Wang, Zhi Wang, Zheng Liu & Pingli Mao

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Correspondence to Feng Wang.

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Dai, S., Wang, F., Wang, Z. et al. Microstructure, mechanical properties, and texture evolution of Mg–Zn–Y–Zr alloy fabricated by hot extrusion–shearing process. J Mater Sci 55, 375–388 (2020). https://doi.org/10.1007/s10853-019-03946-2

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