Effects of proton irradiation on the microstructure and shape recovery characteristics of a NiTi alloy
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001 (China)
- Institute of Polymer Materials, Qingdao University, Qingdao 266071 (China)
Highlights: • The complex multilayer structure can be induced by irradiation. • Phase constitution with increased fluence evolved as follows: B19’ → (B19’ + B2 + Ti{sub 2}Ni) → (B2 + Ti{sub 2}Ni + TiH{sub 2}). • The transformation temperature decreases remarkablly with the increasing of irradiation fluence. • The strain recovery characteristics deteriorated significantly with the irradiation fluence increasing. - Abstract: Herein, we investigate the effects of proton irradiation on the structure and shape recovery characteristics of a NiTi alloy and provide a mechanistic explanation of the observed phenomena. Detailed analysis revealed that bombardment with 3 MeV protons induced the formation of a complex multilayer structure comprising TiH{sub 2}, Ti{sub 2}Ni, austenite and austenite-martensite layers along the irradiation direction with increasing distance and the origin of the above structure was shown to be closely related to the preferential sputtering effect and irradiation-induced segregation. Finally, the shape recovery characteristics significantly deteriorated with increasing irradiation fluence, since the multilayer structure hindered the martensitic transformation.
- OSTI ID:
- 22805014
- Journal Information:
- Materials Characterization, Vol. 140; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
Similar Records
Reactive Ni/Ti nanolaminates
Elemental Mapping of NiTi with EFTEM