Constitutive theories of shape memory alloys related to microstructure

The shape memory effect occurring in various alloys is due to a Martensitic phase transformation deforming the lattice. Because of elastic misfit of the product phase within the matrix of the parent phase inhomogeneous microstructures arise at two different length scales. As a consequence the deformation to be observed differs on different length scales and one thoroughly has to discriminate between different levels of description. For shape memory alloys the deformations on each level are discussed. Moreover, constitutive theories covering the whole range from microscopic dimensions up to macroscopic polycrystals are reviewed and their interrelations are presented.

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