Precursor phenomenon on TiNi R phase transformation by X-ray diffraction

T. Ohba, Y. Miyata
2001 Journal de Physique IV : Proceedings  
TiNi alloy system has been widely used for industrial application and fundamental research. Many studies were performed under circumstance that R phase was not certainly established. Recently R phase was established and structure of R phase was determined. Present study reports diffuse scattering study as a precursor phenomenon to R-phase by using four-circle diffractometer under circumstance that the structure was determined. Diffuse scattering was observed around 1/3 of [ 1 1 0 ]*
more » ... 1 0 ]* incommensurate position at various temperatures in parent phase. Shift from commensurate position broke symmetry and temperature dependence looked random. FWHM of 1/3 reflections and integrated intensities were measured also in parent phase. FWHM decreased and integrated intensities increased with approaching transformation temperature. Article published online by EDP Sciences and available at http://dx.
doi:10.1051/jp4:2001805 fatcat:72rffix2ofg6dkmp4fielw6lse