|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Phase Stability, Phase Transformations, and Reactive Phase Formation in Electronic Materials XXI
||A Critical Analysis of Joining Processes for NiTi Shape Memory Alloys
||Boyd Panton, Amirali Shamsolhodaei, Jianxiong Li, Anupam Vivek, Glenn S. Daehn, Peng Peng, Y. N. Zhou
|On-Site Speaker (Planned)
Advanced engineered materials including high entropy alloys, ultrafine grained materials, and shape memory alloys are being developed to enable the next generation of industrial innovations. Shape memory alloys often need to be joined to dissimilar materials when manufacturing multifunctional devices. However, they suffer from critical weldability issues due to brittle intermetallic formation in these dissimilar applications. In addition to these weldability issues, the unique material properties resultant from solid-state phase transformations are extremely sensitive to the microstructure and chemical composition. An ideal welding solution would maintain the stability of the phase transformations at low and high fatigue cycles by not coarsening the microstructure nor altering the composition. New joining methods that limit heat input have proven capable of creating these ideal joints. This critical analysis will compare current state-of-the-art techniques for welding shape memory alloys such as laser welding, with emerging technologies including the laser impact welding process.
||Joining, Phase Transformations, Process Technology