MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Microstructure Evolution of Mg–4.3Zn–0.7Y–0.6Zr Alloy during Solution Heat Treatment
Junjie LiYacong ZhangJincheng WangZhongming Zhang
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2014 Volume 55 Issue 2 Pages 264-269

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Abstract

The microstructure evolution in a Mg–4.3Zn–0.7Y–0.6Zr (mass%) alloy was investigated during solution heat treatment from 300 to 500°C for 12 h. In the as-cast and solution-treated at 300°C for 12 h states, the microstructures are consisting of I-phase and α-Mg. After solution treated at 400°C for 12 h, besides I-phase and α-Mg, some long strip precipitates-which are determined as Zn2Zr phase-, also appear in the microstructure. In the solution-treated sample at 500°C for 12 h, small amounts of Zn2Zr and Mg0.97Zn0.03 phases have been found. With the increase of heat treatment temperature, the phase constituents for different states are: α-Mg + I-phase (as-cast) → α-Mg + I-phase (300°C for 12 h) → α-Mg + I-phase + W-phase + Zn2Zr (400°C for 12 h) → α-Mg + Zn2Zr + Mg0.97Zn0.03 (500°C for 12 h).

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© 2014 The Japan Institute of Metals and Materials
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