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Effect of mold temperature on microstructure and mechanical properties of rheo-squeeze casting Mg–3Nd–0.2Zn–0.4Zr alloy

Published online by Cambridge University Press:  24 October 2017

Yushi Chen ,
Guohua Wu ,
Wencai Liu ,
Liang Zhang  and
Quan Wang
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
Quan Wang
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: [email protected]
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Abstract

The effect of mold temperature on microstructure and mechanical properties of a rheo-squeeze casting (RSC) Mg–3Nd–0.2Zn–0.4Zr (NZ30K) alloy were investigated. The results indicated that the rise of mold temperature contributed to the increase of particle size and alloy density and the decrease of dislocation density. The rapid coarsening and then the normal growth of the particles during solution treatment were observed, and the long-rod-like Zn2Zr3 phase occurred. After age treatment, rod-like β′ precipitate was found in the conventional squeeze casting (CSC) alloy, while two types of precipitates including β′ phase and small plate-like β″ phase were observed in the RSC alloy. The amount of Zn2Zr3 phase was increased with rising mold temperature. Compared with the T6-treated CSC sample, the T6-treated RSC sample presented higher mechanical properties due to the larger precipitation strengthening contribution, and the yield strength, ultimate tensile strength, and elongation were up to 160 MPa, 296 MPa, and 7.7%.

Keywords

Mgalloycasting
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 22 , 28 November 2017 , pp. 4206 - 4218
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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