固溶方式及时效对Al-Mg-Si-Cu合金组织及性能的影响

摘要

采用力学性能测试及晶间腐蚀等方法,研究了不同固溶方式及时效对Al-Mg-Si-Cu合金的组织、力学性能和耐晶间腐蚀性能的影响。结果表明：采用逐步提高固溶温度的强化固溶,有利于提高合金的过饱和度；同时强化固溶和双级固溶方式能有效改善时效后合金的第二相析出及分布状态,有利于合金耐晶间腐蚀性能的提高；经强化固溶、双级时效后合金的抗拉强度和平均腐蚀深度分别为295 MPa和39μm,具有良好的强度及耐晶间腐蚀等综合性能。%This paper studies the effects of different solution processes and artificial aging treatments on the microstructure, mechanical properties and inter-granular corrosion of Al-Mg-Si-Cu alloy by tensile test and inter-granular corrosion experiment. The results show that the temperature-incremental strengthening solution treatment increases the super saturation degree of alloy. The strengthening solution and two-step solution treatments are favorable to improve the precipitating and distributing of precipitated phase during the following aging, which in turn enhances the resistance of inter-granular corrosion. The alloy obtains high tensile strength and inter-granular corrosion resistance after strengthening solution and two-step aging. The ultimate tensile strength and the average corrosion depth of the alloy are 295 MPa and 39 μm, respectively.