| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Friction Stir Welding and Processing XI
|
| Presentation Title |
Microstructural Characterization of Lap-jointed Ti-6Al-4V Plates by Pin-less Friction Stir Spot Welding |
| Author(s) |
Hyojin Park, Yong Chae Lim, Scott A Rose, Zhili Feng, Hahn Choo |
| On-Site Speaker (Planned) |
Hyojin Park |
| Abstract Scope |
During a p-FSSW process, the thermo-mechanical input exerted locally around the welding tool causes drastic microstructural changes and is the key for the joint strength and integrity. In the Ti-6Al-4V alloy, the processing temperature distribution is a critical issue due to the microstructural evolution complicated by phase transformation between α-Ti and β-Ti occurring during/after welding. Especially, friction-stirred Ti-6Al-4V alloys exhibit narrow heat-affected zone and thermo-mechanical zone due to the low thermal conductivity of its alloy. In this talk, we present the microstructural evolutions in a p-FSSWed Ti-6Al-4V alloy. Grain size/morphology and grain boundary characteristics was investigated using SEM/EBSD. TEM analysis was conducted to investigate the degree of thermo-mechanical effects on the Ti-6Al-4V alloy during the p-FSSW process. Finally, the microscopic results will be combined with a high-energy synchrotron XRD analysis of texture and constituent phase fraction to understand the effects of p-FSSW parameters on the microstructure development and joint strength. |
| Proceedings Inclusion? |
Planned: |