TY - JOUR
T1 - Effect of prestrain on martensitic transformation in a Ti 46.4Ni47.6Nb6.0 superelastic alloy and its application to medical stents
AU - Takagi, T.
AU - Sutou, Y.
AU - Kainuma, R.
AU - Yamauchi, K.
AU - Ishida, K.
PY - 2006/1
Y1 - 2006/1
N2 - The effect of applied strain on martensitic transformation in a superelastic Ti46.4Ni47.6Nb6.0 alloy at room temperature was investigated by tensile tests, differential scanning calorimetry measurements, and X-ray diffraction. Reverse transformation starting (A s) and finishing (Af) temperatures increased with the application of tensile-strain over 13%, the undeformed specimen showing A s = -29.2°C and Af = 17.9°C, while the 13% predeformed alloy exhibited As = 37.1°C and Af = 40.2°C. Furthermore, the values of the As and Af for the predeformed alloy almost recovered to those of the undeformed alloy when heated to about 42°C and then showed superelasticity again at room temperature. This characteristic is significant for application in sensors, actuators, and medical devices. Especially, medical stents with such qualities show promise as a new class of self-expandable stents with both excellent mountability and deliverability.
AB - The effect of applied strain on martensitic transformation in a superelastic Ti46.4Ni47.6Nb6.0 alloy at room temperature was investigated by tensile tests, differential scanning calorimetry measurements, and X-ray diffraction. Reverse transformation starting (A s) and finishing (Af) temperatures increased with the application of tensile-strain over 13%, the undeformed specimen showing A s = -29.2°C and Af = 17.9°C, while the 13% predeformed alloy exhibited As = 37.1°C and Af = 40.2°C. Furthermore, the values of the As and Af for the predeformed alloy almost recovered to those of the undeformed alloy when heated to about 42°C and then showed superelasticity again at room temperature. This characteristic is significant for application in sensors, actuators, and medical devices. Especially, medical stents with such qualities show promise as a new class of self-expandable stents with both excellent mountability and deliverability.
KW - Martensitic transformation
KW - Shape memory alloy
KW - Stent
KW - Superelasticity
KW - Ti-Ni-Nb alloy
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U2 - 10.1002/jbm.b.30415
DO - 10.1002/jbm.b.30415
M3 - Article
C2 - 16222697
AN - SCOPUS:30344469089
VL - 76
SP - 179
EP - 183
JO - Journal of Biomedical Materials Research - Part B Applied Biomaterials
JF - Journal of Biomedical Materials Research - Part B Applied Biomaterials
SN - 1552-4973
IS - 1
ER -