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The Effect of Casting Speed on Microstructure, Microsegregation, and Mechanical Properties of High-Strength Mg-Nd-Zn-Zr Alloy

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Abstract

High-quality Mg-Nd-Zn-Zr magnesium alloy billets were successfully prepared by direct chill casting. The effect of casting speed on microstructure, microsegregation, and mechanical properties of the Mg-Nd-Zn-Zr alloy was systematically investigated. The results show that the as-cast microstructure is composed of equiaxed α-Mg and Mg12Nd. Optimum values of mechanical properties were obtained corresponding to the casting speed of 90 mm/min. An age hardening at 200 °C took a remarkable effect on the mechanical properties of billets. The maximum ultimate tensile strength ~ 323.4 MPa was obtained in the billet undergoing T6 heat treatment. The shapes of concentration curves of various alloying elements (e.g., Nd and Zn) in Mg-Nd-Zn-Zr, as predicted by the Gulliver–Scheil model, resemble reasonably with the shapes measured by electron probe microanalysis.

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Acknowledgment

This study is supported by the National Natural Science Foundation of China (Grant No. 51775329), the Nature Science Foundation of Tianjin City (Grant No. 16JCQNJC03600), the Training Scheme of Shanghai Higher Education Youth Teacher (Grant No. ZZSHOU16016), and the Doctoral Scientific Research Foundation of Shanghai Ocean University (Grant No. A2-0203-17-100325). One of the authors (PL) gratefully acknowledges the financial support from Shanghai Collaborative Innovation Center for Heavy Casting/Forging Manufacturing Technology.

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Authors and Affiliations

  1. College of Engineering Science and Technology, Shanghai Ocean University, Shanghai, 201306, People’s Republic of China

    Xingwei Zheng & Shiming Wang

  2. Shanghai Collaborative Innovation Center for Heavy Casting/Forging Manufacturing Technology, School of Materials, Shanghai Dianji University, Shanghai, 201306, People’s Republic of China

    Peng Luo

  3. National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiaotong University, Shanghai, 200240, People’s Republic of China

    Xingwei Zheng & Jie Dong

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  1. Xingwei Zheng
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  2. Peng Luo
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  3. Jie Dong
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  4. Shiming Wang
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Correspondence to Jie Dong.

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Zheng, X., Luo, P., Dong, J. et al. The Effect of Casting Speed on Microstructure, Microsegregation, and Mechanical Properties of High-Strength Mg-Nd-Zn-Zr Alloy. J. of Materi Eng and Perform 28, 1753–1761 (2019). https://doi.org/10.1007/s11665-019-3878-0

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  • DOI: https://doi.org/10.1007/s11665-019-3878-0

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