Abbreviated Journal Title
Appl. Phys. Lett.
ACQUIRED IN-SITU; TRANSFORMATIONS; Physics, Applied
Deformation in the P3 phase (R-phase) of NiTiFe was investigated by in situ neutron diffraction during compressive loading at cryogenic temperatures. At 216 K, upon loading the R-phase detwinned and subsequently underwent a reversible stress-induced transformation to the B19' phase (martensite). At 92 K on the other hand, detwinning was suppressed and the stress-induced martensite formed did not transform back upon unloading. The experiments also directly observed a hitherto theoretically predicted B33 phase. Rietveld refinement of the neutron diffraction spectra were used to determine lattice parameters of the B33 and R-phases. Plane-specific elastic moduli were also determined for the R-phase.
Applied Physics Letters
Krishnan, V. B.; Shmalo, S. B.; Rathod, C. R.; Bourke, M. A. M.; and Vaidyanathan, R., "Low temperature deformation of the R-phase in a NiTiFe shape memory alloy" (2010). Faculty Bibliography 2010s. 388.