Texture evolution during nitinol martensite detwinning and phase transformation
- Fort Wayne Metals Research Products Corporation, 9609 Ardmore Ave., Fort Wayne, Indiana 46809 (United States)
- Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Ave., 433/D008, Argonne, Illinois 60439 (United States)
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, 102249 Beijing (China)
Nitinol has been widely used to make medical devices for years due to its unique shape memory and superelastic properties. However, the texture of the nitinol wires has been largely ignored due to inherent complexity. In this study, in situ synchrotron X-ray diffraction has been carried out during uniaxial tensile testing to investigate the texture evolution of the nitinol wires during martensite detwinning, variant reorientation, and phase transformation. It was found that the thermal martensitic nitinol wire comprised primarily an axial (1{sup ¯}20), (120), and (102)-fiber texture. Detwinning initially converted the (120) and (102) fibers to the (1{sup ¯}20) fiber and progressed to a (1{sup ¯}30)-fiber texture by rigid body rotation. At strains above 10%, the (1{sup ¯}30)-fiber was shifted to the (110) fiber by (21{sup ¯}0) deformation twinning. The austenitic wire exhibited an axial (334)-fiber, which transformed to the near-(1{sup ¯}30) martensite texture after the stress-induced phase transformation.
- OSTI ID:
- 22253810
- Journal Information:
- Applied Physics Letters, Vol. 103, Issue 24; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
Similar Records
Evolution of Crack-Tip Transformation Zones in Superelastic Nitinol Subjected to in Situ Fatigue. a Fracture Mechanics And Synchrotron X-Ray Microdiffraction Analysis
Probing Martensitic Transition in Nitinol Wire: A Comparison of X-ray Diffraction and Other Techniques