Stability of an Amorphous TiCuNi Alloy Subjected to High‐Pressure Torsion at Different Temperatures

Abstract

The amorphous melt‐spun (MS) Ti 50 Ni 25 Cu 25 alloy is subjected to high‐pressure torsion (HPT) at temperatures of 20‐150 °C. The bright‐field (BF) TEM images of the alloy change as a result of HPT processing, the view of the bright‐field image depends on the temperature of HPT processing. HPT processing leads to a decrease in the energy of structural relaxation during heating up to 400 °C, in comparison with the initial MS ribbons. The temperature of crystallization of the MS Ti 50 Ni 25 Cu 25 alloy decreases after HPT processing by 40–20 °C (depends on the temperature of HPT processing). In the MS Ti 50 Ni 25 Cu 25 alloy, HPT processing and subsequent annealing produces noticeably finer grains than annealing at 450 °C of the initial MS alloy. Consequently, HPT processing alters the crystallization kinetics of the MS Ti 50 Ni 25 Cu 25 alloy.