We use phase field simulations to study composites made of two differentferroelastics (e.g., two types of martensite). The deformation of one materialdue to a phase transformation can elastically affect the other constituent andinduce it to transform as well. We show that the phase transformation can thenoccur above its normal critical temperature and even higher above thistemperature in nanocomposites than in bulk composites. Microstructures dependon temperature, on the thickness of the layers, and on the crystal structure ofthe two constituents -- certain nanocomposites exhibit a great diversity ofmicrostructures not found in bulk composites. Also, the periodicity of themartensite twins may vary over 1 order of magnitude based on geometry.keywords: Ginzburg-Landau, martensitic transformation, multi-ferroics,nanostructure, shape-memory alloy
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