Transformation cycling in NiTi alloys

NiTi alloys with different transition temperature sets M s , T R and A f are considered here to be affected by cycling between the martensite and the parent phase. In alloys with a starting temperature M s higher than 50 degrees C, M s can shift on cycling below the critical temperature T R at which a transition to the rhombohedral (R) phase appears. Alloys with M s <