2219铝合金中厚板双轴肩搅拌摩擦焊接头析出相分布特征及耐腐蚀性能研究  

Study on Distribution Characteristics of Precipitated Phases and Corrosion Performance in Bobbin Tool Friction Stir Welding Joint of 2219 Aluminum Alloy Medium-Thickness Plate

作　　者：张华[1] 李志航 郝云飞 季亚娟 陈敏 陶虎威 姜炳鑫 ZHANG Hua;LI Zhihang;HAO Yunfei;JI Yajuan;CHEN Min;TAO Huwei;JIANG Bingxin(Beijing Institute of Pectrochemical Technology,Beijing 102617,China;Capital Aerospace Machinery Company,Beijing 100076,China;AVIC Manufacturing Technology Institute,Beijing 100024,China)

机构地区：[1]北京石油化工学院,北京102617 [2]首都航天机械有限公司,北京100076 [3]中国航空制造技术研究院,北京100024

出　　处：《航空制造技术》2024年第19期112-116,124,共6页Aeronautical Manufacturing Technology

基　　金：航空科学基金(202000110Z6001);北京市属高等学校高水平科研创新团队建设支持计划项目(BPHR20220110)。

摘　　要：研究了2219-C10S铝合金10 mm中厚板在双轴肩搅拌摩擦焊(BT-FSW)过程中,在不同焊接速度下的焊缝金相组织和析出相分布情况,为提高2219-C10S铝合金BT-FSW的焊接接头质量和性能提供了重要参考。结果表明,由于在板厚方向上的热输入不均匀,导致在焊核中心区域出现了团状结构。在焊缝不同区域,析出相Al_(2)Cu的含量占比、大小和分布存在显著差异。在焊核中心区,析出相的面积占比和平均尺寸最小,且以颗粒形式呈现弥散分布,析出相颗粒的数目最多;轴肩影响区的析出相面积占比最高,轴肩影响区和热影响区的析出相尺寸近似。通过周期浸润腐蚀试验发现,母材区耐腐蚀性最差,热影响区和轴肩影响区其次,焊核中心区耐腐蚀性最优。The present study investigated the metallographic characteristics and distribution of precipitated phases within the weld nugget of 10 mm thick 2219-C10S aluminum alloy medium-thickness plate under different welding speeds using Bobbin tool friction stir welding(BT-FSW),providing significant reference value for improving the quality and performance of BT-FSW joints of 2219-C10S aluminum alloy.The results indicate that the inhomogeneity of heat input in the thickness direction of the plate leads to the formation of a clustered structure in center region of the weld nugget.There is a notable disparity in the content,size,and distribution of the Al_(2)Cu precipitates across various regions of the weld.In the center of weld nugget zone,the area proportion and average size of the precipitates are the smallest,with a particle-like dispersion and the highest number of particles.The shoulder-affected zone has the highest area proportion of precipitates,while the sizes of precipitates in the shoulder-and heat-affected zones are comparable.Periodic immersion corrosion tests revealed that the base material exhibits the poorest corrosion resistance,followed by the heat-and shoulder-affected zones,with the center of weld nugget zone demonstrating the optimal corrosion resistance.

关 键 词：2219铝合金 双轴肩搅拌摩擦焊(BT-FSW) 析出相 周期浸润腐蚀 耐腐蚀性 

分 类 号：TG453.9[金属学及工艺—焊接]