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Effect of low-angle grain boundary and twin on precipitation mechanism in pre-rolled AZ91 magnesium alloy

  • Metals & corrosion
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Abstract

Low-angle grain boundary and twin significantly affect precipitation behavior. Twins were introduced into AZ91 magnesium alloys by pre-rolling. And then, aging treatment was carried out in pre-rolled AZ91 magnesium alloys to investigate the precipitation behavior. The results show that the low-angle grain boundary and the extension twin provide the nucleation position for second phase, while double twin with low-elastic strain energy is not favored for the segregation of Al atom, causing that the precipitate hardly nucleates. Second phase firstly precipitates in the low-angle grain boundary and the twin boundary, followed by precipitating inside the twin. The low-angle grain boundary-induced lath-shaped second phase is attributed to dislocation, while the twin-induced precipitate is mainly affected by dislocation and stacking fault. From thermodynamic perspective, the morphology of twin-induced precipitate firstly displays spherical shape and then grows into lath-like shape.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (grant numbers 52071139, U21A0130), the National Natural Science Foundation of Hunan (grant numbers 2023JJ30262, 2023JJ30252), the Research Foundation of Education Bureau of Hunan Province (grant number 21B0471), and National Natural Science Foundation of Chongqing (grant number 2023NSCQ-MSX4320)

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Authors and Affiliations

  1. College of Marine Equipment and Mechanical Engineering, Jimei University, Xiamen, 361021, China

    Xiao Liu, Bi-wu Zhu & Wen-hui Liu

  2. Research Institute of HNU in Chongqing, Hunan University, Chongqing, 401120, China

    Xiao Liu, Luo-xing Li, Cong-chang Xu & Peng-cheng Guo

  3. Hunan Engineering Research Center of Forming Technology and Damage Resistance Evaluation for High Efficiency Light Alloy Components, Hunan University of Science and Technology, Xiangtan, 411201, China

    Xiao Liu, Quan-hui Wan & Bi-wu Zhu

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  1. Xiao Liu
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Contributions

XL contributed to the formal analysis, data curation, writing—original draft and experimetnal design. QW was involved in the software, methodology and carry out measurements. BZ assisted in the conceptualization and writing—review and editing. WL contributed to the visualization and calculation. LL was involved in the writing—review and editing. CX assisted in the visualization. PG was involved in the methodology.

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Correspondence to Bi-wu Zhu.

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Handling Editor: Zhao Shen.

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Liu, X., Wan, Qh., Zhu, Bw. et al. Effect of low-angle grain boundary and twin on precipitation mechanism in pre-rolled AZ91 magnesium alloy. J Mater Sci 59, 3662–3675 (2024). https://doi.org/10.1007/s10853-024-09400-2

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