An in situ neutron diffraction mechanical study of superelastic NiTi and NiTi-TiC composites

摘要: Superelastic NiTi and NiTi-TiC composites were subjected to static uniaxial compressive loading while neutron diffraction spectra simultaneously acquired. A methodology was established obtain quantitative strain, texture phase volume fraction information during the forward reverse stress-induced martensitic transformation. Despite presence of 10 vol.% stiff TiC particles, a macroscopic strain 3% obtained in composite on fully recovered unloading. The observed behavior suggests that martensite accommodates mismatch with transforming austenite (while they co-exist) particles (in case composite). also simultaneous cycling. average mechanically-loaded (at given stress) remained unaltered load-unload cycles. However, differences both noted as cycling progressed, suggesting these factors are responsible for changes stress-strain response mechanical