Interface structure and mobility in martensitic shape memory alloys

The interface structure and its mobility in the martensites of shape memory alloys (SMAs) are reviewed. The emphasis is placed on the evolution of interface structure during deformation and the relations of interface characteristics to the mobility in cold-deformed TiNi-based alloys and the types, structure and mobility of interfaces in Cu-based SMAs. With the increase of deformation strain in the cold-deformed TiNi alloys, the interface type of martensite variants changes and their mobility becomes bad gradually. For the Cu-based SMAs, the A/C and A/B interfaces have effective mobility and may move smoothly and become straight during motion. On the contrary, the mobility is not effective for the A/D interface.