Non-classical austenite-martensite interfaces

Ball & Carstensen [2, 3], theoretically investigated the possibility of the occurrence of non-classical austenite-martensite interfaces and studied the cubic-to-tetragonal case extensively. Here, we aim to present an analy-sis of such interfaces recently observed by Seiner et al. [12] in CuAlNi single crystals, undergoing a cubic-to-orthorhombic transition. We show that they can be de-scribed by the non-linear elasticity model for martensitic transformations and we make some predictions regarding the volume fractions of the martensitic variants involved, as well as the habit plane normals