摘要
以1.5 mm的5A90铝锂合金薄板为研究对象,进行搅拌摩擦搭接焊试验研究。结果表明：搭接接头焊核区内发生动态再结晶,生成细小的等轴晶粒,热机影响区在搅拌摩擦作用下晶粒发生变形,热影响区在热循环作用下晶粒粗化。板材厚度方向的金属流动行为导致了搭接界面迁移,随着轴肩下压量的增加,最大迁移高度增加。显微硬度测试表明,母材区硬度最高,热机影响区和热影响区硬度下降,焊核区硬度上升。
Taking 1.5 mm 5 A90 aluminum lithium alloy plate as the research object, the experimental research about friction stir lap welding was carried out. The results show that, the grains of weld nugget zone are fine and equiaxed due to dynamic recrystallization; the deformation of the grain occurs in the thermal-mechanically affected zone under the action of friction stir, and the grain size of the heat affected zone is coarse under the action of thermal cycling. The metal flow behavior in the thickness direction leads to the migration of overlap interface, with the increase of plunge depth, the maximum migration height increases. The hardness test shows that the hardness of the base metal zone is the highest, the hardness of thermal-mechanically affected zone and heat affected zone decreases, and that of the nugget zone increases.
作者
高恩志
王杰
李作成
孔德成
刘春忠
GAO Enzhi;WANG Jie;LI Zuocheng;KONG Decheng;LIU Chunzhong(School of Material science and Engineering, Shenyang Aerospace University, Shenyang 11013 6, China)
出处
《热加工工艺》
CSCD
北大核心
2018年第11期22-24,共3页
Hot Working Technology
基金
国家自然科学基金资助项目(51405310)
辽宁省自然科学基金资助项目(201602554)
辽宁省教育厅一般项目资助(L2015410)
关键词
5A90铝锂合金
搅拌摩擦搭接焊
界面迁移
组织
性能
5A90 aluminum lithium alloy
fiiction stir lap welding
interface migration
microstructure
property
