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添加适量稀土元素钇后,镁铝合金高温力学性能会得以改善。本文利用光学显微镜(OM)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM),对693 K保温24 h的Mg-9.0wt.%Al-2.2 wt.%Zn-6.1wt.%Y铸态合金样品的微结构进行了研究。实验结果表明,显微组织相组成是基体α-Mg、晶界处γ-Mg17Al12、晶胞内的Al2Y、τ-Mg32(Al,Zn)49及-Al5Mg11Zn4相。确定了-Al5Mg11Zn4相与α-Mg基体间的取向关系是(10 10)α//(106),[51053]α//[010]。
Adding appropriate amount of rare earth elements yttrium, magnesium alloy aluminum high temperature mechanical properties will be improved. In this paper, Mg-9.0 wt.% Al-2.2 wt.% Zn (Zn), which had been incubated at 693 K for 24 h, was characterized by OM, XRD, SEM and TEM. The microstructure of -6.1 wt.% Y as-cast alloy samples was investigated. The experimental results show that the phase composition of the microstructure is matrix α-Mg, γ-Mg17Al12 in the grain boundary, Al2Y, τ-Mg32 (Al, Zn) 49 and -Al5Mg11Zn4 in the unit cell. It is confirmed that the orientation relationship between the -Al5Mg11Zn4 phase and the α-Mg matrix is (10 10) α // (106) , [51053] α // [010] .