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《Rare Metal Materials and Engineering》 2010-12
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Effects of Calcium Addition on High Temperature Creep Resistance of Magnesium Alloys with High Zinc

Wan Xiaofeng1,Sun Yangshan1,2,Xue Feng 1,2,Bai Jing1,2,Tao Weijian3(1.Southeast University,Nanjing 211189,China)(2.Jiangsu Key Lab for Advanced Metallic Materials,Nanjing 211189,China)(3.Jiangsu Engineering Research Center for Magnesium Alloys,Nanjing 211224,China)  
The effects of trace Ca addition on microstructure and high-temperature creep resistance of as-cast Mg-12Zn-4Al-0.3Mn alloy were investigated.Results show that the as-cast microstructure of the base alloy consists of α-Mg matrix and block quasicrystalline phase at gain boundaries.The composition of this quasicrystalline phase is closed to that of the equilibrium τ phase(Mg32(Al,Zn)49) in the Mg-Zn-Al ternary system.A small amount of Ca addition to the base alloy results in the formation of a lamellar eutectic ?(Al2Mg5Zn2) and the transformation of the quasicrystalline phase to the equilibrium τ phase in the as-cast microstructure of the alloy.The volume fraction of the ? phase increases with the increase of Ca addition.The creep resistance of the alloys is significantly improved by Ca addition.The optimum creep resistance of the alloy is obtained by 0.6% Ca addition under the creep condition of 175 oC,70 MPa,whose steady state creep rate is approximately one order of magnitude lower than that of its base alloy.
【Fund】: 国家科技支撑计划(2006BAE04B07)
【CateGory Index】: TG146.22
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