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Effect of Zn addition on microstructure and mechanical properties of Mg–9Gd–3Y–0.5Zr alloy

Published online by Cambridge University Press:  29 December 2017

Wendong Cui ,
Lv Xiao ,
Wencai Liu ,
Guohua Wu ,
Xianfei Wang  and
Zhongquan Li
Wendong Cui
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Lv Xiao
Affiliation:
Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China; and Shanghai Engineering Technology Research Center of Near-Net-Shape Forming for Metallic Materials, Shanghai 201600, China
Wencai Liu*
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Guohua Wu*
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Xianfei Wang
Affiliation:
Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China; and Shanghai Engineering Technology Research Center of Near-Net-Shape Forming for Metallic Materials, Shanghai 201600, China
Zhongquan Li*
Affiliation:
Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China; and Shanghai Engineering Technology Research Center of Near-Net-Shape Forming for Metallic Materials, Shanghai 201600, China
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

A comparison of microstructure, mechanical properties and fracture behavior of Mg–9Gd–3Y–xZn–0.5Zr (x = 0, 0.2, 0.5, 1.0, and 1.5) (wt%) alloys under different thermal treatment conditions was investigated in this study. The results showed that the as-cast alloys were comprised of Mg matrix, eutectic compounds and cuboid-shaped phases. The eutectics were Mg24(Gd, Y)5 in the alloys of Zn content ≤0.2 wt%, while (Mg, Zn)3RE in the other three alloys. Fine lamellar long period stacking ordered structure formed inside of matrix of the as-cast Zn-containing alloys and its quantity increases with raising Zn content. Mg12(Gd, Y)Zn was observed at grain boundary of Mg matrix after solution treatment in the alloys of Zn content ≥0.5 wt%. Peak-aged Mg–9Gd–3Y–0.5Zn–0.5Zr alloy exhibited a desirable combination of strength and elongation with 244 MPa in yield strength, 371 MPa in ultimate tensile strength and 3.8% in EL. Meanwhile, the fracture behavior of the studied alloys was also investigated.

Keywords

ZnMg–9Gd–3Y–0.5Zr alloymicrostructuremechanical propertyfracture behavior
Type
Articles
Information
Journal of Materials Research , Volume 33 , Issue 6 , 28 March 2018 , pp. 733 - 744
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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