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Precipitation behaviors of 14H LPSO lamellae in Mg96Gd3Zn0.5Ni0.5 alloys during severe plastic deformation

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Abstract

A high-performance extruded Mg96Gd3Zn0.5Ni0.5 alloy containing 14H LPSO phases and two different dynamic recrystallization (DRX) grains was successfully fabricated, which exhibited superior ultimate tensile strength (400 MPa) and outstanding elongation (20%). Meanwhile, the results show that the substitution of 0.5 at.% Zn with Ni element can refine the grain size of as-cast Mg96Gd3Zn1 alloy significantly. While limited 14H LPSO lamellae are formed near the block 14H LPSO phases due to Ni addition during solution treatment, copious 14H LPSO lamellae induced by external force are precipitated in α-Mg matrix after subsequent hot extrusion in the Mg96Gd3Zn0.5Ni0.5 alloy. Furthermore, two different DRX phenomena are successively stimulated with increasing deformation strain. Discontinuous DRX emerges first at the interface of block 14H LPSO phases, and then continuous DRX occurs in the kink bands of 14H LPSO lamellae. The precipitation behaviors of 14H LPSO lamellae and two types of DRX grains contribute to the excellent mechanical properties.

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Acknowledgements

The authors acknowledge Shanxi Key Laboratory of Advanced Magnesium-Based Material, Taiyuan University of Technology (No. 2015-01), Natural Science Foundation of Shanxi Province (Nos. 2009011028-3 and 2012011022-1), Ph.D. Programs Foundation of Ministry of Education of China (20111402110004) and National Natural Science Foundation of China (Nos. 51474153 and 51574175).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China

    Wei Liu, Jinshan Zhang, Chunxiang Xu, Ximei Zong, Wei Zhu & Qiangqiang Ma

  2. Shanxi Key Laboratory of Advanced Magnesium-based Materials, Taiyuan, 030024, China

    Wei Liu, Jinshan Zhang, Chunxiang Xu, Ximei Zong, Wei Zhu & Qiangqiang Ma

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  1. Wei Liu
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Correspondence to Jinshan Zhang or Chunxiang Xu.

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Liu, W., Zhang, J., Xu, C. et al. Precipitation behaviors of 14H LPSO lamellae in Mg96Gd3Zn0.5Ni0.5 alloys during severe plastic deformation. J Mater Sci 52, 13271–13283 (2017). https://doi.org/10.1007/s10853-017-1431-9

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