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

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

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The microstructure evolution and mechanical properties of Mg-15Gd-3Y alloy were investigated in the as-cast and heat treated conditions. The microstructure evolution from as-cast to cast-T4 states involved α-Mg solid solution+Mg5(Gd, Y) phase→α-Mg supersaturated solid solution+rare earths compound Mg3(Gd1.26,Y0.74)→α-Mg supersaturated solid solution+rare earths compound Mg3(Gd0745,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%.

Mg-15Gd-3Y alloysolution heat treatmentmicrostructureage-hardeningmechanical propertiesrare earths

ZHANG Lei、DONG Xuanpu、LI Jiqiang、WANG Wenjun、WANG Aihua、FAN Zitian

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State Key Laboratory of Material Forming and Mould & Die Designing, Huazhong University of Science and Technology, Wuhan 430074, China

School of Mechanical and Energy, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China

国家自然科学基金Special Fund for Basic Research and Operating Expenses of Central CollegeNatural Science Foundation of Ningbo City

50775085M20090612008A610049

2011

10.1016/S1002-0721(10)60395-X

稀土学报(英文版)
中国稀土学会

稀土学报(英文版)

CSTPCDCSCDSCIEI
影响因子：1.3
ISSN：1002-0721
年,卷(期)：2011.29(1)
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