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Solidification of Mg–Zn–Zr Alloys: Grain Growth Restriction, Dendrite Coherency and Grain Size

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The solidification characterization of Mg–xZn–0.5Zr (x = 0, 1, 3, 4, 5 wt%) alloys has been extensively investigated through thermal analysis, microstructure characterization and thermodynamic calculations. The impact of Zn content on the grain growth restriction, dendrite coherency and thus the final grain size has been investigated and discussed. Increasing Zn content, the grain size of Mg–xZn–0.5Zr alloy was firstly refined and then coarsened with the finest grain size of ~ 50 μm for the Mg–3Zn–0.5Zr (ZK31) alloy. Significant effects of the grain size on the mechanical properties were observed in the investigated alloys. The combination of growth restriction factor theory and dendrite coherency point provides a reasonable explanation of the grain size results. It helps to further understand the mechanisms of grain refinement and grain coarsening related to solute content, providing reference for alloy design and grain size prediction.

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Acknowledgements

Z.W. Shan and his students acknowledge the supports by the National Key Research and Development Program of China (No. 2017YFB0702001) and the Natrual Science Foundation of China (No. 51621063). They also appreciate the support from the International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technologies, the Collaborative Innovation Center of High-End Manufacturing Equipment and the Science and Technology Department of Shaanxi Province (Nos. 2016KTZDGY-04-03 and 2016KTZDGY-04-04). R.S. Chen and his students acknowledge the National Natural Science Foundation for Young Scholars (No. 51701218) and the National Science and Technology Major Project of China through Project No. 2017ZX04014001.

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Correspondence to Rongshi Chen or Zhiwei Shan.

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Available online at http://link.springer.com/journal/40195.

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Li, P., Hou, D., Han, EH. et al. Solidification of Mg–Zn–Zr Alloys: Grain Growth Restriction, Dendrite Coherency and Grain Size. Acta Metall. Sin. (Engl. Lett.) 33, 1477–1486 (2020). https://doi.org/10.1007/s40195-020-01069-1

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  • DOI: https://doi.org/10.1007/s40195-020-01069-1

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