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采用重力铸造法制备了不同Si含量的Mg-6Al-1Zn-x Si合金,分析了合金的显微组织,测试了合金在150℃下的拉伸力学性能。结果表明,合金均由α-Mg基体、β-Mg17Al12和Mg2Si相组成。随着Si含量的增加,α-Mg基体晶粒的平均尺寸逐渐减小,Mg2Si颗粒的平均尺寸逐渐增大;β-Mg17Al12由分布于晶界及晶内的点状转变为网状分布于晶界上;合金的高温抗拉强度、屈服强度和伸长率逐渐提高。此外,高温拉伸断裂形式为准解理脆性断裂。
The Mg-6Al-1Zn-xSi alloys with different Si contents were prepared by gravity casting. The microstructure of the alloy was analyzed and the tensile mechanical properties of the alloy were tested at 150 ℃. The results show that the alloy consists of α-Mg matrix, β-Mg17Al12 and Mg2Si phase. With the increase of Si content, the average size of the α-Mg matrix grains gradually decreases and the average size of the Mg2Si grains gradually increases. The β-Mg17Al12 phase transitions from the point shape distributed in the grain boundary and the crystal to the net shape distribution Industry; alloy high temperature tensile strength, yield strength and elongation gradually increased. In addition, high temperature tensile fracture mode is quasi-cleavage brittle fracture.