INVESTIGADORES
BARUJ Alberto Leonardo
congresos y reuniones científicas
Título:
In Situ Texture Measurements of Stress-Induced Martensite in Superelastic NiTi using Hard Synchrotron Radiation
Autor/es:
M. HASAN; W. SCHMAHL; A. BARUJ; J. KHALIL ALLAFI; S. GOLLERTHAN
Lugar:
Pacific Grove, California
Reunión:
Congreso; Int. Conf. on Shape Memory and Superelastic Technologies (SMST 2006); 2006
Institución organizadora:
ASM International
Resumen:
The deformation of superelastic NiTi due to the stress-induced transition from cubic B2 to monoclinic B19´ phase is localised in a Lüders-band-like transformation shear bands (TSB). We investigate the phase state and texture in the bands in-situ using diffraction with high-energy synchrotron-radiation. Residual austenite is observed to persist up to the end of the superelastic plateau in the stress-strain curve. The deformation corresponds to a displacement of the boundary of the TSB. After a certain volume of the specimen has transformed when the boundary has passed by, there is no further change of the crystallographic state of this volume up to the end of the macroscopic stress-strain plateau. The variant orientation texture is different at the surface from that present in the bulk.
