摘要
2017 aluminum alloy plates with an ultrafine grained （UFG） structure were produced by equal channel angular processing （ECAP） and then were joined by underwater friction stir welding （underwater FSW）. X-ray diffractometer （XRD）, transmission electron microscope （TEM）, scanning electron microscope （SEM） and microhardness tester were adopted to investigate the microstructural and mechanical characteristics of the FSW joint. The results indicate that an ultrafine grained microstructure with the mean grain size of-0.7 Ixm is obtained in the weld nugget by using water cooling. However, The FSW joint exhibits softening compared with the ultrafine grained based material and the heat affected zone （HAZ） has the lowest hardness owing to the coarsening of the strengthening precipitates.
2017 个铝合金盘子与一极其细小颗粒(UFG ) 结构由相等的隧道被生产尖处理(ECAP ) 然后被加入由在水下磨擦促使焊接(在水下 FSW ) 。X 光检查衍射计(XRD ) ，传播电子显微镜(TEM ) ，扫描电子显微镜(SEM ) 和 microhardness 测试者被采用调查微结构和 FSW 关节的机械特征。结果显示有 0.7 m 的吝啬的谷物尺寸的极其细小的颗粒的微观结构被使用水冷却在焊接金块获得。然而，与极其细小的颗粒的基于的材料相比弄软的 FSW 联合展览和热影响了地区(HAZ ) 由于加强变粗的最低坚硬猛抛。
基金
Projects(50774059, 51074119) supported by the National Natural Science Foundation of China
作者简介
Corresponding author:王快社,Professor,PhD,Tel:+86-29-82205096,E-mail:wangkuaishe888@126.com.
