About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability, Phase Transformations, and Reactive Phase Formation in Electronic Materials XXV
|
| Presentation Title |
Phase Transformation-Enhanced Ultrasonic Welding of Pure Titanium: Strategic Interlayer Selection for Temperature-Dependent Applications |
| Author(s) |
Cheng-Chang Hsieh, Kuan-Chieh Hu, Dong-Yu Wu, Jhe-Yu Lin |
| On-Site Speaker (Planned) |
Cheng-Chang Hsieh |
| Abstract Scope |
This study investigates interlayer-induced phase transformations during ultrasonic welding of pure α-Ti sheets using Al, Ni, and Fe interlayers. Al interlayers achieved optimal room-temperature performance (1700 N) through concentrated plastic deformation, enabling base metal fracture. However, strength decreased significantly at elevated temperatures (150-300°C), limiting high-temperature applications. Conversely, Ni and Fe interlayers triggered β-phase transformation, enhancing interfacial integrity through β-stabilization effects. The Fe interlayer, with a lower β-transus point (595°C), achieved peak strength at 1200 J welding energy, while Ni interlayer required higher energy (1800 J) due to its elevated β-transus point (765°C) and slower diffusion kinetics. Both Fe and Ni interlayers maintained superior strength (1500-1600 N) at 300°C with base metal fracture, demonstrating excellent high-temperature performance. These findings establish strategic interlayer selection criteria: Al interlayers for low-energy, room-temperature applications, and Fe/Ni interlayers for elevated-temperature service through controlled β-Ti phase transformation mechanisms. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Joining, Phase Transformations, Mechanical Properties |