J. Phys. IV France 112 (2003) 755
Deformation behaviors at various temperatures and corresponding microscturcures of Ti 36Ni 49Hf 15 alloyL.H. Liu, X.L. Meng, W. Cai and L.C. Zhao
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
The deformation behaviors at various temperatures and corresponding microstructures of Ti 36Ni 49Hf 15 high temperature shape memory alloy had been studied. The tensile behavior of the Ti 36Ni 49Hf 15 alloy is characterized by continuous yielding and high work hardening in the temperature range from 293 K to 673 K. The critical stress for martensite variant reorientation is relatively high and a maximum elongation of about 30% is observed at about 510 K. 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 déformation temperature and strain, the preferential oriented SIM gradually develop to martensite variants with variant-crack/variant-intersect morphologies.
© EDP Sciences 2003