Abstract
Transformation sequence and second phases in Ti 50− X Ni 50W X , Ti 50Ni 50− X W X and Ti 51Ni 49− X W X alloys with X = 1–2 at.% are investigated. Two different second-phase particles located at grain boundaries are observed. The lattice parameters of Ti 50Ni 49W 1 martensite are calculated from the selected area diffraction patterns (SADP) and all of them are larger than those of Ti 50Ni 50 alloy. Experimental results indicate that the W atoms replace Ni atoms, instead of Ti ones in these alloys. In addition, Ti 50− X Ni 50W X and Ti 51Ni 49− X W X alloys have a two-stage B2 → R → B19′ transformation, but the Ti 50Ni 50− X W X alloy has a one-stage B2 → B19′ transformation because the former Ms temperatures are depressed significantly. The shape recovery of these alloys can be improved by the W solid-solution hardening. With higher matrix hardness in these alloys, there is better shape recovery.
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