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Effect of Rolling Schedule on Microstructure and Properties of Mg-Ca-Mn-Sn Sheet

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Abstract

Achieving an excellent combination of high strength and ductility in low-alloy magnesium (Mg) alloys is a great challenge. In this work, a new Mg-1.03Ca-0.47Mn-2.39Sn alloy was designed. The extruded sheet has a low ultimate tensile strength (UTS, ~268 MPa) and total elongation (EL, ~7.5%). However, after rolling and annealing, the strength and plasticity are greatly improved. It is noted that the UTS and EL increased simultaneously with the increase in a rolling pass and cumulative reduction. Especially, an excellent combination of UTS of 310 MPa and EL of 22% is achieved by 4-passes hot rolling and the fifth pass differential speed rolling. Microstructural results show that the high strength is mainly attributed to the uniformly fine grain size ( ~4.5 μm) and the high-density striated CaMgSn and globular Mg2Ca precipitates. In addition, the uniform grain size, weaken transverse direction-split texture and the activation of multiple slips systems all contribute to the enhanced ductility. These findings provide an effective method for manufacturing low-alloy Mg alloys with high strength and ductility by rolling.

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Acknowledgments

The authors acknowledge support from the National Natural Science Foundation of China (U1910213), Taiyuan University of Science and Technology Scientific Research Initial Funding (Grant No. 20202039 and 20192002), Applied Basic Research Program of Shanxi Province (201901D211290).

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Authors and Affiliations

  1. School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, China

    Qinhong Fan, Yongyong Jia, Zhihui Cai, Lifeng Ma & Wei-tao Jia

  2. Heavy Machinery Engineering Research Center of the Ministry of Education, Taiyuan University of Science and Technology, Taiyuan, 030024, China

    Qinhong Fan, Zhihui Cai, Lifeng Ma & Wei-tao Jia

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  1. Qinhong Fan
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  2. Yongyong Jia
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Correspondence to Zhihui Cai or Lifeng Ma.

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Fan, Q., Jia, Y., Cai, Z. et al. Effect of Rolling Schedule on Microstructure and Properties of Mg-Ca-Mn-Sn Sheet. J. of Materi Eng and Perform 31, 10137–10142 (2022). https://doi.org/10.1007/s11665-022-07047-1

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  • DOI: https://doi.org/10.1007/s11665-022-07047-1

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