摘要
采用反挤压成形工艺获得AZ80镁合金复杂壳体零件,并对成形件的显微组织、室温力学性能以及拉伸断口进行了研究。结果表明,挤压温度在320℃时,成形件的挤压成形性较差;随着挤压温度的升高,成形零件的挤压成形性逐渐变好。反挤压成形的AZ80镁合金零件,室温力学性能比铸态的明显提高。挤压温度为410℃时,成形零件的综合力学性能较佳,其抗拉强度、伸长率分别为280MPa、12%。挤压温度在380℃以上,其室温拉伸断口表现为明显的韧性断裂特征。
The microstructure and mechanical properties and tensile fracture of AZ80 Magnesium alloy multilayer shell parts formed at different temperatures by backward extrusion forming technology were investigated in this paper.The results indicate that the forming performance for parts extruded at 320℃is poorer,while that of extruded at 350℃ above is much better.With increasing in extrusion temperature,the internal grain dynamic recrystallization for AZ80 Magnesium alloy forming parts is gradually uniformity,in which the uniformly fine equiaxial grain are observed in the extruded parts at 410℃.AZ80 Magnesium alloy parts by backward extrusion forming exhibits much better mechanical properties than that by cast.The forming parts extruded at 410℃ shows excellent performance with tensile strength of 280MPa and elongation of 12%.When the backward extrusion temperature is above 380 ℃,the tensile fracture of the forming parts is characterized by ductile fracture mechanism.
出处
《沈阳理工大学学报》
CAS
2013年第4期72-76,共5页
Journal of Shenyang Ligong University
关键词
AZ80镁合金
反挤压
微观组织
力学性能
AZ80 Magnesium alloy
backward extrusion
microstructure
mechanical properties
