| Abstract Scope |
Zirconia-based shape memory ceramics represent a distinct family of shape memory materials due to their ability to reversibly transform between tetragonal and monoclinic phases. The shape memory and superelastic effects of zirconia have been demonstrated in the form of micro-pillars and micro-particles. However, owing to the intrinsic brittleness and the large volume change upon martensitic transformation, scaling shape memory ceramics up for bulk applications has been extremely challenging. Here, we explore the scaling-up of shape memory ceramics in the form of metal matrix composites, which are produced using additive friction stir deposition with uniform particle distribution and good interface quality. Stress-induced martensitic transformation is observed during compression of the composites, showing significant energy dissipation in the absence of surface cracks. Thermally-induced reverse martensitic transformation is confirmed in the post-compression samples, wherein no conspicuous peaks are observed in the heat flow measurement. |