|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Phase Transformation Across Multiscale Material Interfaces
||Interdiffusion and Kinetics Study of Ti-Al Intermetallic by Brazing
||Sutinee Sujittosakul, Samad Firdosy, Kevin Yu, Kevin Smith, Brian Phan, Sevan Chanakian, Vilupanur Ravi, Terry Hendricks, Jean-Pierre Fleurial, Thierry Caillat, Ike Chi
|On-Site Speaker (Planned)
The joining of titanium and its alloys is an important process utilized in aerospace, marine, chemical and biomedical applications. Al-based filler metals are attractive because of the relatively low brazing temperatures (600-750°C) needed to form successful joints. In this study, we report on the Ti to Ti interface in joints using Al-based filler metal. Brazing was done under high vacuum at 550 – 650°C for various hold times. The cross-section of the bond interface was analyzed using optical microscopy and SEM/EDS. In addition, long term annealing and the addition of impurities, i.e. Mg, Cr, Si, Fe, in the Al filler metal were studied to understand kinetics and layer growth. The SEM/EDS results indicate that TiAl3 is the most prominent phase formed at Ti-Al interface. Annealing for 48 h results in voiding and the thickening of TiAl3 layer. The effect of impurities on Ti-Al layer growth is discussed.
||Planned: Supplemental Proceedings volume