Interface Characteristics and Mechanical Properties of Ultrasonic-Assisted Friction Stir Lap Welded 7075-T6 Aluminium Alloy
文献类型：期刊论文
| 作者 | He, Changshu; Zhang, Zhiqiang; Li, Ying; Wei, Jingxun; Zhai, Menggang; Zhao, Su; Zhao, Xiang |
| 刊名 | MATERIALS
 |
| 出版日期 | 2020 |
| 卷号 | 13期号:23 |
| 关键词 | MATERIAL FLOW DEFECT FEATURES VIBRATION MICROSTRUCTURE JOINTS LOAD BEHAVIOR |
| 英文摘要 | In this work, friction stir lap welding (FSLW) and ultrasonic-assisted friction stir lap welding (UAFSLW) was applied to 6-mm-thick 7075-T6 alloy sheets using three welding tools with the same process parameters. The joint formation, microstructural characteristics, and mechanical properties of the resulting lap joints were then investigated. The results showed that ultrasonic vibration significantly promoted the flow of metal at the interface, enlarged the size of the stirred zone (SZ), and reduced the angle between the hook defect and the interface. During lap shear testing, the FSLW and UAFSLW joints fractured in a similar manner. The fracture modes included tensile fracture, shear fracture, and a mixture of both. Cold lap and hook defects may have served as crack-initiation zones within the joint. Under configuration A (i.e., upper sheet on the retreating side (RS)), all joints failed in the shear-fracture mode. The effective lap width (ELW) of the joint welded using tool T2 was the greatest. This resulted in a higher shear fracture strength. The maximum shear fracture strength of the UAFSLW joint was 663.1 N/mm. Under configuration B (i.e., upper sheet on the advancing side (AS)), the shear fracture strength was greatly affected by the fracture mode. The highest shear fracture strength of the UAFSLW joint, 543.7 N/mm, was welded by tool T3. Thus, under otherwise identical conditions, UAFSLW joints can withstand a greater fracture shear strength than FSLW joints, as ultrasonic vibration helps to mix the material at the interface, thus, enlarging the SZ and diminishing the cold lap defects. |
| 源URL | [http://ir.nimte.ac.cn/handle/174433/22403]  |
| 专题 | 中国科学院宁波材料技术与工程研究所 2020专题_期刊论文 2021专题_期刊论文 |
| 作者单位 | 1.He, CS (corresponding author), Northeastern Univ, Key Lab Anisotropy & Texture Mat, Shenyang 110819, Peoples R China. 2.He, CS (corresponding author), Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China. |
| 推荐引用方式 GB/T 7714 | He, Changshu,Zhang, Zhiqiang,Li, Ying,et al. Interface Characteristics and Mechanical Properties of Ultrasonic-Assisted Friction Stir Lap Welded 7075-T6 Aluminium Alloy[J]. MATERIALS,2020,13(23). |
| APA | He, Changshu.,Zhang, Zhiqiang.,Li, Ying.,Wei, Jingxun.,Zhai, Menggang.,...&Zhao, Xiang.(2020).Interface Characteristics and Mechanical Properties of Ultrasonic-Assisted Friction Stir Lap Welded 7075-T6 Aluminium Alloy.MATERIALS,13(23). |
| MLA | He, Changshu,et al."Interface Characteristics and Mechanical Properties of Ultrasonic-Assisted Friction Stir Lap Welded 7075-T6 Aluminium Alloy".MATERIALS 13.23(2020). |
入库方式： OAI收割
来源：宁波材料技术与工程研究所
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