Effect of Hydrogen Doping on Stress-Induced Martensitic Transformation in a Ti-Ni Shape Memory Alloy

In this paper, we report how the charged hydrogen in a Ti-50.8Ni (at.pct) alloy acts during stress-induced martensitic transformation and aging. Hydrogen is preferentially trapped in the B19' martensite phase near the surface of the specimen. The hydride formed by hydrogenation dissociates during the stress-induced martensitic transformation. The hydrogen diffuses into the interior of the specimen through aging in air, resulting in suppression on the stress-induced martensitic transformation.