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研究了固溶处理对Mg-8Al-1Zn-1Si合金显微组织和力学性能的影响。结果表明,铸态合金主要由α-Mg、β-Mg17Al12和Mg_2Si相组成。固溶处理过程中,β-Mg17Al12相溶于基体而形成α-Mg过饱和固溶体,粗大的汉字状Mg_2Si相颗粒逐渐溶解、溶断而转变为相对细小的球状。随固溶处理时间延长,合金的硬度逐渐降低;室温与150℃下的抗拉强度、屈服强度和伸长率逐渐提高。合金的拉伸断裂形式为准解理脆性断裂。
The effect of solution treatment on the microstructure and mechanical properties of Mg-8Al-1Zn-1Si alloy was studied. The results show that the as-cast alloy mainly consists of α-Mg, β-Mg17Al12 and Mg_2Si phases. In the process of solution treatment, β-Mg17Al12 is dissolved in the matrix to form α-Mg supersaturated solid solution. The coarse Chinese-shaped Mg_2Si phase particles gradually dissolve and dissolve into relatively small spherical particles. With the prolongation of solution treatment time, the hardness of the alloy gradually decreased; the tensile strength, yield strength and elongation at room temperature and 150 ℃ increased gradually. Tensile fracture of the alloy in the form of quasi-cleavage brittle fracture.