TY - JOUR
T1 - Effect of annealing on deformation-induced martensite stabilisation of NiTi
AU - Mahmud, A.S.
AU - Yang, Hong
AU - Tee, S.
AU - Rio, G.
AU - Liu, Yinong
PY - 2008
Y1 - 2008
N2 - It is known that deformation via martensitic transformation stabilises the martensite in NiTi shape-memory alloys, as manifested in the increase of the temperature for the reverse transformation of the deformed martensite. This stabilisation has direct implication to the design of shape-memory devices. This study investigates the effect of annealing temperature after cold working on the martensite stabilisation effect of a Ti–50.2 at% Ni alloy. It is found that the stabilisation effect, measured as the increase of the reverse transformation temperature, decreases with decreasing annealing temperature. This implies that, for near-equiatomic NiTi alloys, the pseudoelastic behaviour, which is achieved at low annealing temperatures, is less affected by the stabilisation effect than the shape-memory effect, which is optimised by annealing at high annealing temperatures.
AB - It is known that deformation via martensitic transformation stabilises the martensite in NiTi shape-memory alloys, as manifested in the increase of the temperature for the reverse transformation of the deformed martensite. This stabilisation has direct implication to the design of shape-memory devices. This study investigates the effect of annealing temperature after cold working on the martensite stabilisation effect of a Ti–50.2 at% Ni alloy. It is found that the stabilisation effect, measured as the increase of the reverse transformation temperature, decreases with decreasing annealing temperature. This implies that, for near-equiatomic NiTi alloys, the pseudoelastic behaviour, which is achieved at low annealing temperatures, is less affected by the stabilisation effect than the shape-memory effect, which is optimised by annealing at high annealing temperatures.
U2 - 10.1016/j.intermet.2007.09.003
DO - 10.1016/j.intermet.2007.09.003
M3 - Article
SN - 0966-9795
VL - 16
SP - 209
EP - 214
JO - Intermetallics
JF - Intermetallics
IS - 2
ER -