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Characterization and Interpretation of the Multiple Crystallographic Features of ε′ Precipitates in an Ag-Containing Mg-Sn Alloy

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Abstract

A novel orientation relationship (OR) between the ε′ precipitates and Mg matrix has been characterized in a Mg-Sn-Ag-Zn-Mn alloy. This OR is expressed by (0 2 0)ε′//(0 0 0 2)α, [0 0 2]ε′//[1 1 \( \bar{2} \) 0]α. The ε′ precipitates exhibit two major pairs of facets parallel to (1 0 \( \bar{1} \))ε′ and (1 0 1)ε′ and a minor pair of facets of (0 0 2)ε′. The reason for the appearance of these interface orientations has been consistently explained by the secondary constrained coincidence site lattice (II-CCSL) model. In other words, the observed facets are preferred because of their smaller interface misfit. The interfacial structures of the three facets were determined to be microscopically flat by the model. These crystallographic features are similar but definitely different from the previously reported ε′ precipitates with an OR of (0 0 2)ε′//(0 0 0 2)α, [2 0 0]ε′//[1 1 \( \bar{2} \) 0]α. A comprehensive evaluation of the interface misfit and the lattice strain to sustain the II-CCSL structure showed that neither type of precipitate is clearly superior to the other. Moreover, a growth-ledge-aided morphology evolution path of the precipitates was proposed according to the experimental results, indicating that both thermodynamic and kinetic factors should be considered in understanding the precipitate morphology.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant No. 51401135) and the Sichuan Applied Basic Research Project (Grant No. 2018JY0430). The authors express their gratitude to Mr. Sufyan Naseem at Sichuan University for his constructive discussion and proofreading.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, P.R. China

    Xuefei Huang & Li Chen

  2. Science and Technology on Reactor Fuel and Materials Key Laboratory, Nuclear Power Institute of China, Chengdu, 610041, Sichuan, P.R. China

    Hui Wang

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  1. Xuefei Huang
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  2. Li Chen
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Correspondence to Xuefei Huang or Hui Wang.

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Manuscript submitted October 6, 2019.

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Huang, X., Chen, L. & Wang, H. Characterization and Interpretation of the Multiple Crystallographic Features of ε′ Precipitates in an Ag-Containing Mg-Sn Alloy. Metall Mater Trans A 51, 2002–2010 (2020). https://doi.org/10.1007/s11661-020-05684-6

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  • DOI: https://doi.org/10.1007/s11661-020-05684-6

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