| 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。 |
| 关键词: 搅拌摩擦焊 铝合金 微观结构 纳米压痕 蠕变 |
| 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） |
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| Nanoindentation Characterization of 2219-T6/2195-T8 Aerospace Heterogeneous Aluminum Alloy Friction Stir Welding Joints |
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Wu Dichao1, Wu Kerui2, Wang Feifan*3, Wang Wenqin1, Cui Chao3, Wang Ning3
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1. School of Advanced Manufacturing, Nanchang University, Nanchang 330031;2. The PLA Unit 93160, Beijing 100076;3. Beijing Institute of Astronautical Systems Engineering, Beijing 100076
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| 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. |
| Key words: friction stir welding aluminum alloy microscopic structure nanoindentation creep |
