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利用普通重力铸造方法,制备了Mg-9Al-6Si镁合金。用光镜(OM),扫描电镜和能谱仪(SEM/EDS)研究了铸态Mg-9Al-6Si镁合金的显微组织,用XRD分析了合金的相组成,测试了合金室温拉伸力学性能和硬度,用SEM观察了合金拉伸断口形貌。结果表明:Mg-9Al-6Si镁合金铸态组织主要由-αMg基体和分布在其上的粗大棱状枝晶或多边形块状初晶Mg2Si相及连成网状的-βMg17Al12相组成,无汉字状Mg2Si相。该合金室温拉伸断口是以准解理断裂为主的脆性断裂,断裂沿-αMg基体和Mg2Si相的界面处产生并扩展,抗拉强度为137.45 MPa,硬度为123 Hv1。
Mg-9Al-6Si magnesium alloy was prepared by ordinary gravity casting method. The microstructure of as-cast Mg-9Al-6Si magnesium alloy was investigated by OM, SEM and EDS. The phase composition of the as-cast Mg-9Al-6Si magnesium alloy was analyzed by XRD. The tensile properties at room temperature Properties and hardness of the alloy were observed by SEM. The results show that the as-cast microstructure of Mg-9Al-6Si magnesium alloy is mainly composed of -αMg matrix, coarse-grained dendrites or polygonal primary precipitates Mg2Si phase and continuous reticular-βMg17Al12 phase with no Chinese characters Like Mg2Si phase. The room temperature tensile fracture is a brittle fracture dominated by quasi-cleavage fracture. The fracture originates and expands along the interface of -αMg matrix and Mg2Si phase. The tensile strength is 137.45 MPa and the hardness is 123 Hv1.