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.
出处
《热加工工艺》
CSCD
北大核心
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)
关键词
7050铝合金
逐步固溶
显微组织
力学性能
晶间腐蚀
7050 A1 alloy
step-solution
microstructure
mechanical properties
intergranular corrosion
