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Affiliation of Author(s):材料科学工程学院
Teaching and Research Group:材料科学工程学院
Journal:The International Journal of Advanced Manufacturing Technology
Funded by:企事业单位委托科技项目
Key Words:Copper · Bobbin tool friction stir welding； Temperature field； Microstructure evolution；Mechanical properties
Abstract:This paper completes the welding of 4-mm-pure copper with bobbin tool-friction stir welding technology for the frst time, and we discovered the evolution of microstructure by combining the temperature feld evolution, microstructure, mechanical properties, electrical properties, and chemical corrosion resistance of welded joints. The fndings demonstrate that the temperature feld is dynamic, with the advancing side experiencing the highest peak temperature (422°C). The size of recrystallized grain in the stir zone (SZ) is slightly larger than that of the base metal (BM), and the “banded structure” of alternating coarse-grain bands and fne grain bands is observed in this region. The microstructure of the heat-afected zone (HAZ) has larger grain size. Both the advancing and retreating sides of the thermomechanically afected zone (TMAZ) have a distinct microstructure, with the advancing side having a more pronounced elongated and curved microstructure. The welded joint has a specifc microstructure gradient from the standpoint of the overall microstructure, which results in the fracture location at TMAZ withe the biggest microstructure gradient in the tensile test, and the welded joint’s efciency is only 57.56% of the base metal. At the same time, the resistivity and the chemical corrosion resistance of the welded joint will decrease. During the welding process, the grains in the stir zone mainly undergo geometric dynamic recrystallization and the heat-afected zone mainly undergoes dynamic recovery.
Co-author:Liyupeng,sunshicheng,gongwenbiao,宫文彪
First Author:liuwei
Indexed by:Journal paper
Page Number:1
Translation or Not:no
Date of Publication:2023-05-23