固溶处理对液态模锻6061铝合金显微组织的影响

Effect of solid solution treatment on microstructure of liquid forging 6061 aluminum alloy

采用光学显微镜、扫描电镜、能谱分析以及定量金相法对液态模锻6061铝合金的微观组织以及固溶处理时第二相的变化规律进行了研究。结果表明：模锻态6061铝合金的微观组织呈树枝状分布,压力作用下晶粒没有产生明显变形。在固溶处理过程中,随着固溶温度的升高,第二相的溶解速率加快,残余第二相的面积逐渐减少。在一定的固溶温度下,残余第二相的面积与固溶时间呈指数型变化。根据企业生产的实际需要,液态模锻6061铝合金适宜的固溶工艺为560℃固溶处理5 h。

The microstructure and evolution of the second phase during solid solution treatment of liquid forged 6061 aluminum alloy were studied by means of optical microscope,scanning electron microscopy,EDS analysis and quantitative metallographic method. The results show that the as-liquid forged 6061 aluminum alloy has a dendritic microstructure,and the grains do not exhibit obvious deformation under pressure. During the solid solution treatment,with the increasing of the solution temperature,the dissolution of the second phase accelerates,and the area of the residual second phase gradually decreases. At a certain solution temperature,the area of the residual second phase and the solution time exponentially change. According to the actual needs of enterprise production,the suitable solution process of the liquid forging 6061 aluminum alloy is solution treated at 530 ℃ for 5 h.