| Abstract Scope |
It has recently become clear that lattice engineering can dramatically impact the properties of shape memory ceramics (SMCs). Classical lattice engineering is practiced by chemical doping: small changes in chemistry adjust the lattice parameters, and in turn influence the martensitic transformation. However, our recent work has highlighted new corollary directions for lattice engineering with great potential. First, the emergence of advanced electron backscatter diffraction techniques has enabled, for the first time, a detailed view of which crystallographic variants are formed in SMCs, and suggests that these may be controlled not by interface crystallography, but rather by the self-accommodation of twinning pairs. Second, manipulation of the strain state extrinsically, through, e.g., applied stresses or geometrical constraints, distorts the lattice and is found to have rather profound impacts on SMC properties. This talk will review the crystallography of SMCs and new efforts to manipulate it to improve shape memory properties. |