The formation of {332}<113> twins, which was one of the deformation modes in metastable -type alloys, was studied by means of high-resolution transmission electron microscopy and simulations. It was found that the interface structure of the twin resembled that of ”-martensite. The movement of atoms which was required in order to form such twins was explained by a   ” process, followed by an ”   inverse transformation process. The former process set up suitable conditions for the formation of the {332}<113> twin. Thus; the atom displacement direction was parallel to <113>, the habit plane was {332}, the shear strain was 0.2907 and the volume change involved a 0.4% expansion. A subsequent ”   twin inverse transformation, generated by a shear strain of 0.0628, resulted in a {332}<113> twin with a shear strain of 0.3535.

Y.Takemoto, M.Hida, A.Sakakibara: Journal of the Japan Institute of Metals, 1996, 60[11], 1072-8