固溶时效处理对Al-6.6Zn-2.3Mg-2.1Cu-0.12Zr合金组织性能的影响  

Solution and Aging Treatment of Al-6.6Zn-2.3Mg-2.1Cu-0.12Zr Aluminum Alloy

作　　者：刚建伟[1] 韩小磊[2] 李志辉[2] 朱宝宏[2] 张永安[2] 

机构地区：[1]东北轻合金有限责任公司,黑龙江哈尔滨150060 [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

出　　处：《稀有金属》2012年第4期523-528,共6页Chinese Journal of Rare Metals

基　　金：国家"973"计划项目课题(2012CB619504)资助;国家自然科学基金项目资助(50904010);国际科技合作项目资助(2010DFB5034)

摘　　要：采用光学显微镜、扫描电镜、透射电镜、X射线衍射、硬度测试、电导率测试和室温拉伸性能测试等分析手段,研究了Al-6.6Zn-2.3Mg-2.1Cu-0.12Zr合金挤压板带固溶、单级时效和双级时效制度下的组织和性能。研究表明,Al-6.6Zn-2.3Mg-2.1Cu-0.12Zr合金挤压板带采用475℃/2 h的固溶处理制度,析出相回溶充分,无过烧现象;合金采用475℃/2 h+120℃/24 h的T6时效处理制度,晶内析出相细小弥散,晶界析出相连续分布;合金采用475℃/2 h+110℃/8 h+160℃/28 h的T74双级固溶时效处理制度,晶内析出相以η'和η为主,晶界析出物完全断开。The microstructure and properties of A1-6.6Zn-2.3Mg-2.1Cu-0.12Zr alloy extruded plates in solution, single-aging, twostep aging condition were studied by means of OM, SEM, TEM, XRD, hardness measurement test, electrical conductivity test and tensile test. The results showed that 475 ℃/2 h was appropriate solution treatment for the A1-6.6Zn-2.3Mg-2.1Cu-0.12Zr alloy extruded plate. By this solution, precipitated phase dissolves adequately with no overheat appearing. By T6 solution and aging treatment of 475℃/2 h ＋ 120℃/24 h, the precipitates in the matrix of the alloy are fine and disperse, and the precipitates on the grain boundary distribute continuously. By T74 two-step solution and aging treatment of 475℃/2 h ＋ 110 ℃/8 h ＋ 160℃/28 h, most matrix precipitates areη＇ and ＂η, and the precipitates on the grain boundary disconnect completely.

关 键 词：Al-6.6Zn-2.3Mg-2.1Cu-0.12Zr铝合金 力学性能 微观组织 固溶处理 时效处理 

分 类 号：TG146.2[一般工业技术—材料科学与工程]