固溶处理对7150铝合金显微组织和力学性能的影响  

Effect of Solution Treatment on Microstructures and Mechanical Properties of 7150 Aluminum Alloy

作　　者：祝贞凤[1] 史春丽[1,2] 李辉 孙杰[1] 尹登峰 ZHU Zhenfeng;SHI Chunli;LI Hui;SUN Jie;YIN Dengfeng(Department of Engineering Materials, Yantai Nanshan University, Longkou 265713, China;Shandong Nanshan Aluminum Co., Ltd., Longkou 265713, China;School of Materials Science and Engineering, Central South University, Changsha 410083, China)

机构地区：[1]烟台南山学院工程材料系,山东龙口265713 [2]山东南山铝业股份有限公司,山东龙口265713 [3]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《热加工工艺》2018年第8期201-203,211,共4页Hot Working Technology

基　　金：山东省高等学校科技计划项目(J16LA57);山东省重点研发计划项目(2015GGX102021)

摘　　要：利用OM和SEM观察了7150铝合金的微观组织,利用拉伸试验机测试了合金的力学性能,研究了单级和双级固溶制度对合金显微组织和性能的影响。结果表明：经485℃/50 min＋120℃/24 h固溶时效处理后,合金的力学性能最优,抗拉强度、屈服强度和伸长率分别达到622、574 MPa、16%;经470℃/30 min＋490℃/20 min双级固溶处理的粗大第二相回溶效果比485℃/50 min单级固溶处理的更好。Microstructure of 7150 aluminum alloy was observed by using OM and SEM, and the mechanical properties of the alloy were tested by tensile testing machine. The influences of one-stage and two-stage solution treatment on the microstructure and mechanical properties of the alloy were studied. The results show that the mechanical properties of the alloy are optimal after solid solution （485 ℃/50 min） and aging （120 ℃/24 h） treatment, the ultimate tensile strength, yield strength and elongation are 622, 574 MPa and 16% respectively. The dissolution effect of the coarse second phase after two-stage solution treatment （470 ℃/30 min＋ 490 ℃/20 min） is better than that of the single-stage solid solution treatment （485 ℃/50 min）.

关 键 词：铝合金 固溶处理 显微组织 力学性能 

分 类 号：TG166.3[金属学及工艺—热处理] TG113[金属学及工艺—金属学]