Studies of Severe Plastic Deformation Conditions for Amorphous and Nanocrystalline Structures Formation in Ti-Ni Based Alloys

Abstract:

Structure formation in TiNi-based shape memory alloys depending on deformation temperature (-196 °C to 400 °C) and pressure (4 to 8 GPa) under conditions of high-pressure torsion (HPT) was studied using TEM and X-ray diffraction methods. The tendency to form an amorphous structure depends on relative positions of the deformation temperature and Ms temperature. Isothermal martensitic transformation is observed in the Ti – 48.5 % Ni alloy as a result of 10-year keeping at RT after HPT. Increasing of pressure suppresses the tendency to form an amorphous structure. The upper deformation temperature limits for amorphous and nanocrystalline structures formation are determined. The thermomechanical conditions of the equal-channel angular pressing for obtaining actual nanocrystalline structure are recommended.

• Periodical: Materials Science Forum (Volumes 503-504)
• Pages: 481-486
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.503-504.481
• Online since: January 2006
• Authors: Sergey Prokoshkin, I. Khmelevskaya, Sergey V. Dobatkin, E.V. Tatyanin, I.B. Trubitsyna
• Keywords: Amorphisation, High Pressure Torsion (HPT), Nanocrystalline Structure, Shape Memory Alloy Actuator, TEM

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