逐步固溶对7050铝合金组织和性能的影响  

Effect of Step-solution on Microstructure and Properties of 7050 Al Alloy

作　　者：徐戊矫[1] 龚利华[1] 谭玉全 

机构地区：[1]重庆大学材料科学与工程,重庆400044

出　　处：《热加工工艺》2014年第20期201-203,共3页Hot Working Technology

基　　金：国家科技重大专项(2012ZX04010-081);国家自然科学基金青年基金资助项目(51205427);中央高校基本科研业务费资助项目(CDJZR13130087)

摘　　要：采用光学金相、扫描电镜、室温拉伸、显微硬度、导电率和晶间腐蚀试验,研究逐步固溶对7050铝合金组织、力学性能和晶间腐蚀性能的影响。结果表明:逐步强化固溶(400℃×4 h+478℃×1 h)+HLA10(190℃×10 min+120℃×24 h)较常规固溶(478℃×1 h)+HLA10(190℃×10 min+120℃×24 h),显著减小合金再结晶数量和晶粒尺寸;EDS分析未溶的第二相为Al7Cu2Fe和Al2Cu Mg相;合金的抗拉强度由530.6 MPa提高到569.1 MPa,伸长率提高了14%,电导率、硬度数值较高;抗晶间腐蚀等级由3级提高至2级。The microstructure, mechanical properties of 7050 A1 alloy treated with step-solution were studied by OM, SEM, tensile test, microhardness, conductivity and intergranular corrosion experiments. The results show that compared with the conventional solid-solution （478 ℃× 1 h） and HLA10（190 ℃×10min＋120 ℃×24h） treatment, the step-solution （400 ℃× 4 h＋478 ℃× 1 h） and HLA10（190 ℃×l0min＋120 ℃×24h） reduces the number of recrystallization and grains. The undissolved second phases analyzed by EDS are A17Cu2Fe and A12CuMg. Its strength increases from 530.6 MPa to 569.1 MPa, elongation enhances by 14%, its hardness and conductivity are relatively high. The intergranular corrosion resistance advances froms the third to the second grade.

关 键 词：7050铝合金 逐步固溶 显微组织 力学性能 晶间腐蚀 

分 类 号：TG156.9[金属学及工艺—热处理]