电焊机2017，Vol.47Issue(8)：98-103,6.DOI:10.7512/j.issn.1001-2303.2017.08.19
2024-T4铝合金搅拌摩擦焊搅拌区位错及组织性能
Analysis of dislocation and microstructure properties in stir zone of friction stir welded for 2024-T4 aluminum alloy
摘要
Abstract
The microstructure and properties of 2024 aluminum alloy friction stir welded joints were analyzed by means of metallography,microhardness and transmission electron microscope The relationship between the formation of dislocations and the changes of the microstructure and hardness of the joints was studied based on the dislocation theory.The results show that the WNZ dislocations are mainly distributed in the grain interior,and most of them exist in the form of dislocation entanglement,accompanied by a large number of precipitation strengthening precipitates Cu2Mg.In the TMAZ area,a large number of dislocations exists in the grain boundaries or grain interior in the form of dislocation pile-up.The dislocation in HAZ area exists near the grain boundaries in the form of dislocation pile-up along with some typical AlCu3 precipitates.In WNZ and TMAZ,the number and types of dislocation are not reduced along with the grain refinement because of the dynamic recovery and dynamic recrystallization process.The dislocation distribution is consistent with microhardness distribution of welded joints.关键词
2024铝合金/搅拌摩擦焊/位错/显微组织/硬度Key words
2024 aluminum alloy/friction stir welding/dislocation/microstructure/hardness分类
矿业与冶金引用本文复制引用
张格铭,刘鹏,冯可云,李嘉宁..2024-T4铝合金搅拌摩擦焊搅拌区位错及组织性能[J].电焊机,2017,47(8):98-103,6.基金项目
国家自然科学基金项目(51305240) （51305240）
