Structure and Properties of TiNi Alloy Subjected to Severe Plastic Deformation and Subsequent Annealing

Abstract:

Processes, occurring on annealing of TiNi alloy, processed by high pressure torsion (HPT), were the focus of this research. Some peaks of heat release were found on heating the deformed samples up to 550 °C. If the initial structure of the alloy was amorphous (after 3.5 turns of HPT), then structural relaxation, crystallization and grain growth occurred on heating. When alloys had a crystalline structure (after rotation by 15 and 90 degrees), recovery, recrystallization and further grain growth took place on heating. It was observed that the TiNi alloy, subjected to 3.5 turns of HPT and subsequent heating up to 550 °C, underwent unusual kinetics of martensitic transformations. The austenite B2 phase transformed to the martensite B19' phase in two ways: B2→R→B19' and B2→ B19'.

• Periodical: Materials Science Forum (Volumes 738-739)
• Pages: 518-524
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.738-739.518
• Online since: January 2013
• Authors: Sergey Belyaev, Maria Drozdova, Natalia Frolova, V.P. Pilyugin, Natalia Resnina, Viacheslav Slesarenko, Vitali Zeldovich
• Keywords: Annealing, Differential Scanning Calorimetry (DSC), High Pressure Torsion, Martensitic Transformation (MT), Severe Plastic Deformation (SPD), Shape Memory Alloy (SMA), TiNi

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