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陈玉华,曹文明,周兴汶,李树寒,戈军委.搅拌头偏移对Ti/Al异种金属搅拌摩擦焊接头成形及拉伸强度的影响[J].稀有金属材料与工程(英文),2019,48(1):63~70.[Chen Yuhua,Cao Wenming,zhouxingwen,Li Shuhan and Ge Junwei.Effect of Tool Offset on Weld Formation and Tensile Strength of Friction Stir Welded Ti/Al Dissimilar Metal Joints[J].Rare Metal Materials and Engineering,2019,48(1):63~70.]
Effect of Tool Offset on Weld Formation and Tensile Strength of Friction Stir Welded Ti/Al Dissimilar Metal Joints
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Received:July 07, 2017  Revised:November 22, 2017
DOI:
Key words: Ti/Al dissimilar metal  Friction stir welding  Tool offset  Tensile strength  Fracture location  Intermetallic phase
Foundation item:国家自然科学基金(51265042)、江西省优势科技创新团队建设专项计划项目(20171BCB24007)、江西省自然科学基金(20114BAB206006)
Author NameAffiliation
Chen Yuhua,Cao Wenming,zhouxingwen,Li Shuhan and Ge Junwei  
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Abstract:
      3mm thick TC4 titanium alloy and 2A14-T4 aluminum alloy were well joined by friction stir welding (FSW), and the influence of tool offset on weld formation and tensile property of the joints was investigated. The results show that tool offset to the Al side has significant influence on ultimate tensile strength (UTS) of the joints. With the increase of tool offset, the UTS increases gradually. When the tool offset is 2.0mm, the UTS of the joint decreases with increasing tool rotation speed from 400r/min to 700r/min. However, when the tool offset is increased to 2.5mm, the UTS of the joint increase with the increase of tool rotation speed. A tool rotation speed of 700r/min and a welding speed of 60mm/min is matched, the highest UST of 347MPa of the joint is obtained, which reaches to about 83% of Al matrix. The tensile results prove that the fracture location and tensile strength of the joints mainly depend on microstructure and intermetallic phases. For the joint with the highest strength, the fracture occurs in the heat affected zone (HAZ) of Al matrix due to brittle TiAl phase formed in the joint.