Microstructure and mechanical properties of as-cast and heat treated Mg-15Gd-3Y alloy

The microstructure evolution and mechanical properties of Mg-15Gd-3Y alloy were investigated in the as-cast and heat treated conditions. The microstrucmre evolution from as-cast to cast-T4 states involved a-Mg solid solution+Mg5(Gd,Y) phase→a-Mg supersaturated solid solution+rare earths compound Mg3...

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Veröffentlicht in:Journal of rare earths 2011, Vol.29 (1), p.77-82
1. Verfasser: 张磊 董选普 李继强 王文俊 王爱华 樊自田
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Sprache:eng
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Zusammenfassung:The microstructure evolution and mechanical properties of Mg-15Gd-3Y alloy were investigated in the as-cast and heat treated conditions. The microstrucmre evolution from as-cast to cast-T4 states involved a-Mg solid solution+Mg5(Gd,Y) phase→a-Mg supersaturated solid solution+rare earths compound Mg3(Gdl.26,Y0.74)→a-Mg supersaturated solid solution+rare earths compound Mg3(Gd0.Tas,Y1.255). It showed that 480 ℃/4 h was the optimal solution treatment parameter. If the solution temperature was high or the holding time was long, such as 520 ℃/16 h, an overheating phenomenon would be induced, which had a detrimental effect on the mechanical properties. When ageing at 225 and 200℃, the alloy would exhibit a significant age-hardening response and great long-time-age-hardening potential, respectively. The best mechanical properties were obtained at the parameters of 480 ℃/4 h+225 ℃/16 h, with the UTS of 257.0 MPa and elongation of 3.8%.
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(10)60395-X