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Effect of aging on super-elasticity and ductility of a cold NiTiTa Alloy

Friday, May 10, 2024: 11:45 AM
Meeting Room II (Hotel Cascais Miragem)
Dr. S. Cai , Fort Wayne Metals Research Products, LLC, Fort Wayne, IN
A cold NiTiTa alloy was found very brittle after fully annealed at high temperatures due to its high austenite stability, which suppressed stress-induced-martensite transformation and dislocation slip. However, ductility and super-elasticity are significantly improved by formation of Ti3Ni4 and Ti2Ni3 precipitates upon aging at lower temperatures. Cold work promotes Ti2Ni3 precipitation during aging. Compared to the as-drawn material, the fully annealed material shows higher strain recovery and elongation after aging for a short amount of time. 1
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