期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 24, 期 12, 页码 3762-3768出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(14)63530-5
关键词
Mg-8Gd-3Y-0.4Zr alloy; heat treatment; microstructure; mechanical property; fracture behavior
资金
- National Natural Science Foundation of China [51171113, 51301107]
- China Postdoctoral Science Foundation [2012M511089, 2013T60444]
- Ministry of Science and Technology of China [2011BAE22B02, 2011DFA50907]
The microstructure, the content of compounds, mechanical properties and fracture behavior of high vacuum die casting Mg-8Gd-3Y-0.4Zr alloy (mass fraction, %) under T4 condition and T6 condition were investigated. The microstructure for the as-cast Mg-8Gd-3Y-0.4Zr alloy mainly consists of alpha-Mg and eutectic Mg-24(Gd,Y)(5) compound. After solution treatment, the eutectic compounds dissolve massively into the Mg matrix. The main composition of solution-treated alloys is supersaturated alpha-Mg and cuboid-shaped phase. The T4 heat treated samples have increasing cuboidal particles with the increase of heat treatment temperature, which turn out good mechanical properties. The optimum T4 heat treatment for high vacuum die cast Mg-8Gd-3Y-0.4Zr alloy is 475 degrees C, 2 h according to microstructure results. The optimum ultimate strength and elongation of solution-treated Mg-8Gd-3Y-0.4Zr alloy are 222.1 MPa and 15.4%, respectively. The tensile fracture mode of the as-cast, and T6 heat treated alloys is transgranular quasi-cleavage fracture.
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