Influnce of structural factor on the volumetric deformation and mechanical destruction of particles and pressed TiNi samples during destructive hydrogenation and recombination

Abstract

The processes of volume deformation and mechanical destruction of the intermetallic compound TiNi by destructive hydrogenation and recombination have been investigation. It is established that interaction of melted and powder TiNi with hydrogen by destructive hydrogenation reactions and recombination accompanied by mechanical destruction of particles. This is due to the content of the martensite component in the material before the destructive hydrogenation. Destructive hydrogenation and recombination of pressed powder samples of melted TiNi is also accompanied by the destruction that is caused by a low proportion of the reverse martensite transformation in deformed TiNi particles, obtained by grinding the ingot. Non-destructive in the process of destructive hydrogenation and recombination are compressed pellets of powder TiNi, which is explained by a significant reverse martensite transformation in deformed particles of dendritic TiNi, compensating the volumetric deformation of intermetallic compound at the expense of the hydride phase transformation.