搅拌摩擦焊和热处理复合工艺对2219铝合金组织性能的影响  

Effects of Compound Technology of FSW and Heat Treatment on Microstructures and Properties of 2219 Aluminum Alloys

作　　者：李小霞 黄亮[1,2] 李建军[1,2] 王泽宇 

机构地区：[1]华中科技大学材料科学与工程学院,武汉430074 [2]华中科技大学材料成形与模具技术国家重点实验室,武汉430074

出　　处：《中国机械工程》2017年第23期2880-2888,共9页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(51575206);国家重点基础研究发展计划(973计划)资助项目(2011CB012802);中国航天科技集团公司航天科技创新基金资助项目(CASC150704);中央高校基本科研业务费专项资金资助项目(2016YXZD055)

摘　　要：研究了不同时效温度和时间对2219铝合金组织性能的影响,对比了搅拌摩擦焊-固溶-时效、固溶-搅拌摩擦焊-时效、固溶-时效-搅拌摩擦焊这三种复合工艺所得2219铝合金的力学性能。结果表明,2219铝合金最佳时效工艺是180℃/6h,其抗拉强度为386MPa,断后延伸率为24.8%,该工艺所得微观组织中晶界上没有位错和第二相粒子,晶内弥散着细小的θ″相。最佳复合工艺方案为搅拌摩擦焊-固溶-时效,所得2219铝合金抗拉强度为380MPa,断后延伸率为15.4%。该工艺所得焊缝组织晶粒异常长大,薄弱区为热影响区,单向拉伸所得断口的韧窝较大较深,底部存在着第二相粒子。The effects on microstructures and properties of 2219 aluminum alloys under different aging temperatures and time were investigated.According to the mechanics properties of 2219 aluminum alloys,three compound technologies were compared,including FSW-solid solution-aging,solid solution-FSW-aging and solid solution-aging-FSW.The results show that the tensile strength and elongation rate of the alloys are as 386 MPa and 24.8%respectively after aging at 180℃/6 h.It is also found that the very fineθ″precipitates appear inside the grains,no second phases and dislocation on grain boundaries.The best mechanics properties of 2219 aluminum alloys are achieved by the compound technology of FSW-solid solution-aging,the tensile strength and elongation rate of the alloys are as 380 MPa and 15.4%respectively.The abnormal growth of grains is found in the joints,and the heat affected zones in the FSW joints are the weak areas of mechanics property.It is also found that the dimples on tensile fracture are more lager and deeper,and second-phase particles appear at the bottom.

关 键 词：2219铝合金 热处理 搅拌摩擦焊 组织性能 析出相 

分 类 号：TG166.3[金属学及工艺—热处理] TG44[金属学及工艺—金属学]