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Ultrasonic Vibration and Rheocasting for Refinement of Mg–Zn–Y Alloy Reinforced with LPSO Structure

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Abstract

In this work, ultrasonic vibration (UV) and rheo-squeeze casting was first applied on the Mg alloy reinforced with long period stacking ordered (LPSO) structure. The semisolid slurry of Mg–Zn–Y alloy was prepared by UV and processed by rheo-squeeze casting in succession. The effects of UV, Zr addition and squeeze pressure on microstructure of semisolid Mg–Zn–Y alloy were studied. The results revealed that the synergic effect of UV and Zr addition generated a finer microstructure than either one alone when preparing the slurries. Rheo-squeeze casting could significantly refine the LPSO structure and α-Mg matrix in Mg96.9Zn1Y2Zr0.1 alloy without changing the phase compositions or the type of LPSO structure. When the squeeze pressure increased from 0 to 400 MPa, the block LPSO structure was completely eliminated and the average thickness of LPSO structure decreased from 9.8 to 4.3 μm. Under 400 MPa squeeze pressure, the tensile strength and elongation of the rheocast Mg96.9Zn1Y2Zr0.1 alloy reached the maximum values, which were 234 MPa and 17.6%, respectively, due to its fine α-Mg matrix (α1-Mg and α2-Mg grains) and LPSO structure.

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Acknowledgements

This work was funded by Project 51505165 supported by National Natural Science Foundation of China. The authors would also like to express their appreciation to the Analytical and Testing Centre, HUST.

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Authors and Affiliations

  1. State Key Laboratory of Materials Processing and Die and Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, People’s Republic of China

    Shulin Lü, Xiong Yang, Liangyan Hao, Shusen Wu, Xiaogang Fang & Jing Wang

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  1. Shulin Lü
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  2. Xiong Yang
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  3. Liangyan Hao
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  4. Shusen Wu
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  5. Xiaogang Fang
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  6. Jing Wang
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Correspondence to Shusen Wu.

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Lü, S., Yang, X., Hao, L. et al. Ultrasonic Vibration and Rheocasting for Refinement of Mg–Zn–Y Alloy Reinforced with LPSO Structure. Met. Mater. Int. 24, 1315–1326 (2018). https://doi.org/10.1007/s12540-018-0125-4

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