固溶处理制度对7050铝合金组织与性能的影响

Effect of Solution Treatment on Microstructure and Properties of 7050 Aluminum Alloy

采用性能测试、结构方程模型(Structural Equation Modeling,SEM)分析等手段研究了单、双级固溶制度对7050超高强铝合金组织与性能的影响。结果显示,双级固溶制度下,随第二级固溶温度升高,合金抗拉强度和硬度呈双峰形态变化;残余第二相随第二级固溶温度升高会逐渐融入基体,温度过高时(500℃),合金会发生过烧;与单级固溶态相比,双级固溶态下合金的抗拉强度和硬度有较大提升,分别能够达到498 MPa和165 HV,单、双级固溶态断口形貌均表现为韧窝型穿晶断裂,但后者韧窝内第二相粒子较前者显著减少。

The effects of single and two-stage solid-soluble system on organization and performance of 7050 ultra-high-strength aluminum alloy were compared and analyzed by means of mechanics performance test and Structural Equation Modeling(SEM)analysis.The results showed that:Under the two-stage solid-soluble system,with the increase of the second-stage solid-soluble temperature,the anti-pull strength and hardness of the alloy showed the twin peak pattern,Residual second phase gradually integrates into the substrate with the increase of the second-stage solid-soluble temperature,and when the temperature is too high(500℃)the alloy has been burned.Compared with the tensile strength and hardness of the alloy under have been greatly improved,reaching 498 MPa and 165 HV,single-stage solid-soluble cut-off appearance is characterized by a ruptured ligamenttype perforation,but the second phase particles in the latter’s ligament nest are significantly reduced than the former.