采用重力铸造法制备Mg-4Al-2Si(AS42)镁合金,研究了铸态合金的显微组织和室温力学性能.结果表明:铸态AS42合金主要由α-Mg基体、β-Mg_(17)Al_(12)相及Mg_2Si相组成;β-Mg_(17)Al_(12)相呈网状和棒状分布于晶界上,粗大的汉字状Mg_2Si相沿晶界或穿晶分布,多边形块状Mg_2Si相随机分布于基体组织中.铸态合金的硬度为64.5HV,室温抗拉强度为113.5MPa,屈服强度为86MPa,伸长率为4.1%;拉伸断裂形式为准解理脆性断裂.
Mg-4Al-2Si (AS42) magnesium alloys were prepared by the gravity casting. Microstructure and mechanical properties at room temperature of the as-cast AS42 alloy were investigated. The results show that the as-cast microstructure consists of α-Mg matrix, β-Mg_(17)Al_(12) phase and Mg_2Si phase. The network and rod shaped β-Mg_(17)Al_(12) phase distribute on grain boundary, and the coarse Chinese script type Mg_2Si particles distribute on grain boundary or transcrystallization, while the block-like Mg_2Si distributes in matrix (α-Mg). The hardness of the alloy is 64.5HV, ultimate tensile strength, yield strength and elongation are about 113.5, 86MPa and 4.1% respectively. The fracture forms of the alloy is quasi-cleavage brittle fracture.
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