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Microstructure, tensile properties and free bulge formability of Sr- and Y-containing AZ31 alloy sheet produced by twin-roll casting and sequential hot rolling

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Abstract

The effects of Sr and Y on microstructure, tensile property and free bulge formability of AZ31 alloy sheet produced by twin-roll casting and sequential hot rolling were investigated to improve the mechanical properties and formability of the AZ31 alloy. Sr and Y addition can form Al4Sr, Al2Y and Al3Y phases which can impede dislocation movement and promote dynamic recrystallization during the rolling deformation and decrease the lattice resistance to dislocation motion by decreasing Al solubility in the alloy, resulting in finer grains, lower dislocation density and no twinning generating in the twin-roll casting and sequential hot rolling (TRC-HR) AZ31–1.3Sr–1.0Y alloy. The maximum stress and elongation of the alloy increase significantly after adding Sr and Y. The average cavity and grain sizes of the TRC-HR AZ31–1.3Sr–1.0Y alloy are smaller, resulting in higher elongation in the alloy. The addition of Y and Sr can effectively improve the free bulge formability and the thickness uniform of the alloy. The Al4Sr, Al2Y and Al3Y phases can inhibit the grain growth by obstructing dislocation motion or grain boundary slip, resulting in smaller grain size of AZ31–1.3Sr–1.0Y alloy bulge parts.

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (Nos. 51705038 and 51875053) and the Natural Science Foundation of Jiangsu Province of China (No. BK20150268).

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Authors and Affiliations

  1. School of Mechanical Engineering, Changzhou High Technology Research Key Laboratory of Mould Advanced Manufacturing, Changzhou University, Changzhou, 213164, China

    Peng Jiang, Luo-Bin Li, Wang-Ping Wu, Zhi-Zhi Wang, Yi Zhang & Nai-Ming Miao

  2. Jiangsu Key Laboratory of Green Process Equipment, Changzhou University, Changzhou, 213164, China

    Peng Jiang

  3. School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin, 150040, China

    Yan-Dong Yu

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  1. Peng Jiang
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  2. Luo-Bin Li
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Correspondence to Peng Jiang.

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Jiang, P., Li, LB., Yu, YD. et al. Microstructure, tensile properties and free bulge formability of Sr- and Y-containing AZ31 alloy sheet produced by twin-roll casting and sequential hot rolling. Rare Met. 39, 1202–1209 (2020). https://doi.org/10.1007/s12598-020-01381-w

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  • DOI: https://doi.org/10.1007/s12598-020-01381-w

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