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采用反挤压成形工艺获得AZ80镁合金多层壳体零件,对成形件的显微组织、室温力学性能进行了分析,并对挤压态壳体零件热处理工艺进行研究。结果表明:挤压成形AZ80镁合金多层壳体零件,通过固溶处理,能够提高较低温度下挤压成形的壳体零件抗拉强度和伸长率;通过时效处理,增加β-Mg17Al12相的数量,能够提高合金的抗拉强度,而延伸率则有所降低。AZ80镁合金固溶处理后,断口形貌为具有一定塑性变形的准解理特征,时效处理后合金的拉伸断口形貌呈现以解理为主的脆性断裂特征,断裂主要发生在结合较薄弱的晶界及β-Mg17Al12相析出相的片层间。
AZ80 magnesium alloy multi-layer shell parts were obtained by reverse extrusion process. The microstructure and mechanical properties at room temperature of the formed parts were analyzed. The heat treatment process of the extruded shell parts was also studied. The results show that the tensile strength and elongation of the extruded parts of AZ80 magnesium alloy multi-layer shell parts can be increased by solution treatment. By aging treatment, the increase of β-Mg17Al12 phase The amount of the alloy can improve the tensile strength, while the elongation is reduced. AZ80 magnesium alloy solution treatment, the fracture morphology is a certain plastic deformation of the quasi-cleavage characteristics of aging treatment after tensile fracture morphology of cleavage-based brittle fracture characterized mainly in the combination of weak Of the grain boundaries and β-Mg17Al12 phase precipitation between the sheets.