单级时效处理对高Zn含量7×××系铝合金显微组织和力学性能的影响  

Effects of Single Stage Aging Treatment on Microstructure and Properties of 7×××Aluminum Alloy with High Zinc Content

作　　者：汤林志 范云强[2,3] 温凯 李志辉[2] TANG Lin-zhi;FAN Yun-qiang;WEN Kai;LI Zhi-hui(Aluminum Corporation of China,Beijing 100082;State Key Laboratory of Nonferrous Metals and Processes,General Research Institute for Nonferrous Metals,Beijing 100088;Northeast Light Alloy Company Limited,Harbin 150060,China)

机构地区：[1]中国铝业集团有限公司,北京100082 [2]北京有色金属研究总院有色金属材料制备加工国家重点实验室,北京100088 [3]东北轻合金有限责任公司,哈尔滨150060

出　　处：《铝加工》2020年第3期11-14,共4页Aluminium Fabrication

基　　金：国家重点研发计划项目课题(2016YFB0300903)。

摘　　要：采用硬度、电导率、拉伸性能等测试手段和透射观察方法研究了7×××系合金在120℃的单级时效处理时保温不同时间下的显微组织和力学性能的变化规律。实验结果表明,随着保温时间的延长,合金的抗拉强度变化很小,屈服强度先升高然后保持在一个平台上,延伸率基本保持在10%以上;基体析出相和晶界析出相的尺寸增大,无沉淀析出带变宽。随着时效时间的延长,基体中的析出相沿着GP区+η’相→η’相→η’相+η相的路径演变。The microstructure and mechanical properties of a 7×××aluminum alloy treated by a single stage aging treatment at 120℃with various times are investigated with observation method of transmission electron microscopy(TEM)and testing methods of hardness,conductivity and tensile property.Experimental results show that with the increase of preservation time,ultimate tensile strength has little changes,yield strength increase firstly and then preserves a platform and elongation basically beyond 10%.The size of matrix precipitate and grain boundary precipitate enlarges and precipitate free zone broadens.With the increase of aging time,the phases in the matrix evolve from GP zone+η'phase toη'phase toη'phase+ηphase.

关 键 词：7×××系合金 时效处理 析出相 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG166.3[金属学及工艺—金属材料]