Distinction between Thermal and Stress-Induced Martensitic Transformations and Inhomogeneity in Internal Stress

Thermal and stress-induced martensitic transformations in NiFeGa single crystals under tension and compression

Heat treatment and stress state effects on the martensitic transformation in [001] and [123] oriented single crystal Ni54Fe19Ga27 alloys are determined. Characteristic temperatures increase for longer aging times and higher hold temperatures. The non-aged [001] crystals exhibit the smallest stress hysteresis and lowest critical stress in tension. The experimental results are interpreted based o...

Three-dimensional Landau theory for multivariant stress-induced martensitic phase transformations. II. Multivariant phase transformations and stress space analysis

Interface propagation and microstructure evolution in phase field models of stress-induced martensitic phase transformations

Analytical solutions for diffuse interface propagation are found for two recently developed Landau potentials that account for the phenomenology of stress-induced martensitic phase transformations. The solutions include the interface profile and velocity as a function of temperature and stress tensor. An instability in the interface propagation near lattice instability conditions is studied num...

Stress-induced martensitic transformations in NiTi and NiTi–TiC composites investigated by neutron diffraction

Superelastic NiTi (51.0 at.% Ni) specimens reinforced with 0, 10 and 20 vol.% TiC particles were deformed under uniaxial compression while neutron diffraction spectra were collected. The experiments yielded in-situ measurements of the thermoelastic stress-induced transformation. The evolution of austenite/martensite phase fractions and of elastic strains in the reinforcing TiC particles and the...

Isothermal Martensitic Transformation as an Internal-Stress-Increasing Process

Based on the results that the magnitude of the stabilization of retained austenite increases with increasing the amount of martensite transformed, it has been assumed that the martensitic transformation is accompanied with an increase in internal resisting stress which subsequently results in the stabilization of retained austenite. By simplifying this internal resisting stress to be a type of ...