Effect of prestrain on martensitic transformation in a Ti46.4Ni47.6Nb6.0 superelastic alloy and its application to medical stents
✍ Scribed by T. Takagi; Y. Sutou; R. Kainuma; K. Yamauchi; K. Ishida
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 288 KB
- Volume
- 76B
- Category
- Article
- ISSN
- 1552-4973
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✦ Synopsis
Abstract
The effect of applied strain on martensitic transformation in a superelastic Ti~46.4~Ni~47.6~Nb~6.0~ alloy at room temperature was investigated by tensile tests, differential scanning calorimetry measurements, and X‐ray diffraction. Reverse transformation starting (A~s~) and finishing (A~f~) temperatures increased with the application of tensile‐strain over 13%, the undeformed specimen showing A~s~ = −29.2°C and A~f~ = 17.9°C, while the 13% predeformed alloy exhibited A~s~ = 37.1°C and A~f~ = 40.2°C. Furthermore, the values of the A~s~ and A~f~ 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. © 2005 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2006