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Microstructure evolution and mechanical properties of Mg–10Gd–3Y–xZn–0.6Zr alloys

Published online by Cambridge University Press:  08 May 2018

Zhibing Ding ,
Yuhong Zhao ,
Ruopeng Lu ,
Haixiang Pei  and
Hua Hou
Zhibing Ding
Affiliation:
College of Materials Science and Engineering, North University of China, Taiyuan 030051, China
Yuhong Zhao*
Affiliation:
College of Materials Science and Engineering, North University of China, Taiyuan 030051, China
Ruopeng Lu
Affiliation:
College of Materials Science and Engineering, North University of China, Taiyuan 030051, China
Haixiang Pei
Affiliation:
College of Materials Science and Engineering, North University of China, Taiyuan 030051, China
Hua Hou
Affiliation:
College of Materials Science and Engineering, North University of China, Taiyuan 030051, China
*
a)Address all correspondence to this author. e-mail: zhaoyuhong@nuc.edu.cn
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Abstract

The microstructure evolution and mechanical properties of Mg–10Gd–3Y–xZn–0.6Zr (x = 0.5, 1, and 1.5 wt%) alloys in the as-cast, solution-treated, and peak-aged conditions have been investigated systematically. The results indicate that the microstructure of the as-cast alloy with 0.5% Zn consists of α-Mg, (Mg,Zn)3RE and Mg24(RE,Zn)5 phases, while the alloy with 1.0 and 1.5% Zn consists of α-Mg, (Mg,Zn)3RE and some stacking faults. Moreover, 18R-LPSO phases are observed in the as-cast alloy with 1.5% Zn. The formation of LPSO phases involves not only stacking sequence ordered but also chemical composition ordered. After solution treatment, the Mg24(RE,Zn)5, (Mg,Zn)3RE, stacking faults, and 18R-LPSO phases transform into 14H-LPSO phases. The 14H-LPSO phase plays an important role in the improvement of mechanical properties, especially for the ductility. The β′ phase with a bco structure precipitates in the peak-aged alloys results in precipitation hardening, significantly improving the tensile strength, but it leads to poor ductility.

Keywords

microstructureMgphase transformationmechanical properties

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Article
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Journal of Materials Research , Volume 33 , Issue 12 , 28 June 2018 , pp. 1797 - 1805
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Copyright © Materials Research Society 2018 

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