2219-T6/2195-T8异质铝合金搅拌摩擦焊接头的纳米压痕表征研究
Nanoindentation Characterization of 2219-T6/2195-T8 Aerospace Heterogeneous Aluminum Alloy Friction Stir Welding Joints
吴迪超 1吴柯锐 2王非凡 3王文琴 1崔超 3王宁3
作者信息
- 1. 南昌大学先进制造学院,南昌 330031
- 2. 中国人民解放军93160部队,北京 100076
- 3. 北京宇航系统工程研究所,北京 100076
- 折叠
摘要
本文采用搅拌摩擦焊对2219-T6和2195-T8进行异质焊接.用纳米压痕建立接头的微观结构与纳米力学性能之间的关系.在搅拌摩擦焊接过程中,SZ的晶粒通过动态再结晶细化,其动态再结晶主要机制为连续动态再结晶和几何动态再结晶;由于材料本身特性,2195的整体显微硬度高于2219,且每个微区显微硬度下降是由于沉淀相的粗化和溶解;蠕变机制主要是位错滑移.晶界、位错和粗沉淀共同作用于材料的抗蠕变性能,并且粗沉淀占主要作用.
Abstract
2219-T6 and 2195-T8 were selected for friction stir heterogeneous welding.Using nanoindentation to establish the relationship between microstructure and nanomechanical properties of joints.During the friction stir welding process,the grains in the stir zone were refined through dynamic recrystallization,and the main mechanisms of dynamic recrystallization were continuous dynamic recrystallization and geometric dynamic recrystallization.Due to the inherent properties of the material,the overall microhardness of 2195 was higher than that of 2219,and the decrease of microhardness in each zone value was due to the coarsening and dissolution of the precipitations.The creep mechanism was mainly dislocation slip.Grain boundaries,dislocations,and coarse precipitations jointly affected the creep resistance of materials,and coarse precipitations played a major role.
关键词
搅拌摩擦焊/铝合金/微观结构/纳米压痕/蠕变Key words
friction stir welding/aluminum alloy/microscopic structure/nanoindentation/creep引用本文复制引用
基金项目
国家自然科学基金面上项目(523***05)
国家自然科学基金企业创新基金项目(U21***04)
出版年
2024
NETL
NSTL
万方数据