Heat treatment, microstructure and mechanical properties of a Mg-Gd-Y alloy grain-refined by Al additions

Jichun Dai, Su-Ming Zhu, Mark Alan Easton, Ming Xing Zhang, Dong Qiu, Guohua Wu, Wencai Liu, Wen-Jiang Ding

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Abstract

The effect of additions of 0.5-1 wt Al on grain refinement, heat treatment and mechanical properties of Mg-10Gd-3Y (wt ) alloy has been investigated. The additions of 0.6-1 wt Al showed a dramatic grain refinement effect, which is associated with the formation of the Al2(Gd0.5Y0.5) particles that act as nucleants for a-Mg grains. Compared to the Zr refined counterpart, the Al refined alloy needed to be solution treated at a higher temperature to dissolve the majority of the intermetallic particles. Subsequent ageing at low temperatures led to pronounced precipitation hardening and consequently a large improvement in strength. In the peak-aged condition, the strength of the Al refined alloy is comparable to that of the Zr refined counterpart.
Original languageEnglish
Pages (from-to)298 - 305
Number of pages8
JournalMaterials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume576
DOIs
Publication statusPublished - 2013

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