Martensitic transformation of the Ti₅₀Ni₄₈Fe₂ alloy deformed at different temperatures

The Ti₅₀Ni₄₈Fe₂ alloy was deformed at low temperature (-70°C) and ambient temperature, where the initial states of the samples were pure martensitic phase or austenitic, respectively. The shape memory effect and the reverse transformation temperature were studied on the samples deformed at different temperatures. A maximum shape recovery strain of 5.6% was obtained and the As′ point of the samples deformed at low temperature was raised by about 40°, while a recovery strain of 4% was obtained and the As″ was raised by 55°, rising up to 35°C, in the samples deformed at ambient temperature. An access was approached to the pre-deformation, storage, transportation and installation of components made of Ti₅₀Ni₄₈Fe₂ alloy at ambient temperature.