Abstract
The deformation behaviors at various temperatures and corresponding microstructures of Ti 36 Ni 45 Hf 15 high temperature shape memory alloy had been studied. The tensile behavior of the Ti 36 Ni 49 Hf 15 alloy is characterized by continuous yielding and high work hardening in the temperature range from 293K to 673K. The critical stress for martensite variant reorientation is relatively high and a maximum elongation of about 30% is observed at about 510K. No superelasticity is observed. The substructure of SIM and deformed SIM in the present alloy is (001) compound twin. Martensite variants are (011) type I twin related. Further increasing the deformation temperature and strain, the preferential oriented SIM gradually develop to martensite variants with variant-crack/ variant-intersect morphologies.
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