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研究了挤压铸造AZ91D镁合金在不同热处理状态下的显微组织、力学性能以及厚度对镁合金试样力学性能的影响。结果表明,挤压铸造AZ91D镁合金铸态显微组织主要由基体α-Mg和在晶内及晶界上分布的β-Mg17Al12相组成,经固溶处理后得到单相α-Mg固溶体组织,而且在α-Mg晶粒内部也出现了少量颗粒状析出物,经固溶时效处理后β-Mg17Al12相再一次在α-Mg晶内和晶界析出,且晶粒变得更加细小;挤压铸造AZ91D镁合金的硬度、屈服强度、抗拉强度随着试样厚度的增加而减小,而伸长率随着试样厚度的增加而增加。
The effects of microstructure, mechanical properties and thickness of squeeze cast AZ91D magnesium alloy on the mechanical properties of magnesium alloy specimens were studied under different heat treatment conditions. The results show that the as-cast microstructure of squeeze-cast AZ91D magnesium alloy consists mainly of α-Mg matrix and β-Mg17Al12 phase distributed in the grain boundary and grain boundaries. After solid solution treatment, the single-phase α-Mg solid solution is obtained, But also a small amount of granular precipitates appeared in the α-Mg grains. The β-Mg17Al12 phase precipitated again in the α-Mg grains and the grain boundaries after solution treatment and the grains became more fine. Casting AZ91D magnesium alloy hardness, yield strength, tensile strength decreases with the increase of the thickness of the sample, while the elongation increases with increasing sample thickness.