Thermal cycles, microstructures and mechanical properties of AA7075-T6 ultrathin sheet joints produced by high speed friction stir welding | |
Ni, Yu1,2; Liu, Yuanhao2; Zhang, Pengxian1; Huang, Jiankang1; Yu, Xiaoquan2 | |
刊名 | MATERIALS CHARACTERIZATION |
2022-05-01 | |
卷号 | 187 |
关键词 | High speed FSW Ultrathin sheet Pinless tool Thermal cycle Microstructure Mechanical property |
ISSN号 | 1044-5803 |
DOI | 10.1016/j.matchar.2022.111873 |
英文摘要 | 0.5 mm thick AA 7075-T6 ultrathin sheets were butt jointed by conventional friction stir welding (C-FSW) and high speed friction stir welding (HS-FSW) under a constant rotational speed (w)/welding speed (v) ratio of 6.67 rad/mm using a pinless tool. In this study, the conventional w of 2000 rpm and conventional v of 300 mm/min were adopted by C-FSW, and the high w of 8000 rpm and high v of 1200 mm/min were adopted by HS-FSW. Compared with C-FSW, HS-FSW presented a fast heating and cooling rate thermal characteristic with a slightly higher peak temperature and significantly shorter elevated-temperature exposure time. Kissing bond defect was appeared in the weld bottom for C-FSW. While, no obvious defect was found in the weld obtained by HS-FSW. Compared with C-FSW, the proportion of deformed grains in the center of nugget zone (NZ) fabricated by HS-FSW was increased. For the joint fabricated by HS-FSW, the upper NZ was dominated by recrystallized grains, and the lower NZ was dominated by deformed grains. The ultimate tensile strength of the joint fabricated by HS-FSW can reach 87% of base metal (BM), and its elongation, yield strength and ultimate tensile strength were increased by 58.8%, 23.3% and 22.8% respectively compared with C-FSW. Both the joints fractured in the center of the NZ. The joint fabricated by C-FSW broke due to the kissing bond defect. While the joint fabricated by HS-FSW may be broken due to the weld thickness reduction. |
WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
语种 | 英语 |
出版者 | ELSEVIER SCIENCE INC |
WOS记录号 | WOS:000807680000001 |
内容类型 | 期刊论文 |
源URL | [http://ir.lut.edu.cn/handle/2XXMBERH/158653] |
专题 | 材料科学与工程学院 |
作者单位 | 1.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China; 2.Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou 730050, Peoples R China |
推荐引用方式 GB/T 7714 | Ni, Yu,Liu, Yuanhao,Zhang, Pengxian,et al. Thermal cycles, microstructures and mechanical properties of AA7075-T6 ultrathin sheet joints produced by high speed friction stir welding[J]. MATERIALS CHARACTERIZATION,2022,187. |
APA | Ni, Yu,Liu, Yuanhao,Zhang, Pengxian,Huang, Jiankang,&Yu, Xiaoquan.(2022).Thermal cycles, microstructures and mechanical properties of AA7075-T6 ultrathin sheet joints produced by high speed friction stir welding.MATERIALS CHARACTERIZATION,187. |
MLA | Ni, Yu,et al."Thermal cycles, microstructures and mechanical properties of AA7075-T6 ultrathin sheet joints produced by high speed friction stir welding".MATERIALS CHARACTERIZATION 187(2022). |
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