Influence of pre-heating temperature and ultrasonic vibration treatment on the structure and martensitic transformations in NiTi foams produced by SHS

The structure and martensitic transformations in NiTi foams produced by self-propagating high-temperature synthesis under the action of ultrasonic vibrations (USV) at different pre-heating temperatures powder mixture are studied. It has been found that with an increase temperature, porous changes from layered to isotropic one foams, but cavities appear. USV treatment reduces number increases maximum temperature which they not formed. size volume fraction precipitates makes chemical composition phase more uniform affects transformation. assumed compensates heat transferred outside thermal chamber titanium waveguide, length reacted zone. This allowed influence formation same way as it was observed during conventional crystallization Ti or Al-based alloys.