Neutron diffraction investigation of hysteresis reduction and increase in linearity in the stress-strain response of superelastic NiTi

Journal Article · Mon May 15 00:00:00 EDT 2006 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.2204650· OSTI ID:20779309

Rathod, C R; Clausen, B; Bourke, M A.M.; Vaidyanathan, R ^[1]

---

1. Advanced Materials Processing and Analysis Center (AMPAC) and Mechanical, Materials, and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816 (United States)

In situ neutron diffraction measurements during loading have been performed on plastically deformed superelastic NiTi samples. The measurements observed retained B19{sup '} phase in the unloaded state as a result of the plastic deformation in otherwise completely B2 phase samples. A reversible stress-induced B2-B19{sup '} transformation on application and removal of stress occurred in the presence of this retained B19{sup '} phase. The amount and orientation of this retained B19{sup '} phase changed with cycling. Such direct atomic scale observations in the bulk are used here for the first time to qualitatively elucidate the macroscopic stress-strain response in plastically deformed superelastic NiTi.

• OSTI ID: 20779309
• Journal Information: Applied Physics Letters, Vol. 88, Issue 20; Other Information: DOI: 10.1063/1.2204650; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
HYSTERESIS
NEUTRON DIFFRACTION
NICKEL ALLOYS
PHASE TRANSFORMATIONS
PLASTICITY
STRAINS
STRESSES
TITANIUM ALLOYS