所属单位：材料科学工程学院
教研室：材料科学工程学院
发表刊物：The International Journal of Advanced Manufacturing Technology
项目来源：企事业单位委托科技项目
关键字：Copper · Bobbin tool friction stir welding； Temperature field； Microstructure evolution；Mechanical properties
摘要：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.
合写作者：李于朋,孙世成,宫文彪,宫文彪
第一作者：刘威
论文类型：期刊论文
页面范围：1
是否译文：否
发表时间：2023-05-23