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Effects of minor Y addition on microstructure and mechanical properties of Mg–Nd–Zn–Zr alloy

Published online by Cambridge University Press:  18 July 2017

Yushi Chen ,
Guohua Wu ,
Wencai Liu ,
Liang Zhang ,
Haohao Zhang  and
Wendong Cui
Yushi Chen
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
Guohua Wu*
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
Wencai Liu
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, China; and Shanghai Light Alloy Net Forming National Engineering Research Center Co., Ltd, Shanghai 201615, China
Liang Zhang
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
Haohao Zhang
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
Wendong Cui
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
*
a) Address all correspondence to this author. e-mail: ghwu@sjtu.edu.cn
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Abstract

Microstructure and mechanical properties of Mg–0.43Nd–xY–0.08Zn–0.11Zr (x = 0, 0.03, 0.06, and 0.12 at.%) alloys were investigated. The results indicated that Mg24Y5 phase was formed in the as-cast Y-containing alloys, the grains were refined and the amount of needle-like Mg12Nd phase in the α-Mg grain interior was increased with increasing Y addition. After solution treatment, the Mg24Y5 phase and needle-like Mg12Nd phase nearly completely dissolved into the α-Mg matrix and long-rod-like Zn2Zr3 phase occurred. The amount of Zn2Zr3 phase was increased with increasing Y content after age treatment. Mg–0.43Nd–0.12Y–0.08Zn–0.11Zr alloy exhibited the best combination of strength and elongation in all conditions, especially in the temperature range of 200–300 °C, and an Arrhenius model was established to study the plastic flow behavior. The improvement in mechanical properties was attributed to the grain refining, solution strengthening and enhanced precipitation hardening of Zn2Zr3 phase and β-type phase.

Keywords

Mgalloycasting
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 19 , 16 October 2017 , pp. 3712 - 3722
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Yang-T. Cheng

References

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