Abstract
High damping is usually associated with a large defect concentration. This paper describes the properties of a densely twinned premartensitic structure that displays a modulus defect of nearly 100%. The marked dispersion occurs in the modulus that is not associated with the transformation. A model is presented that interprets this effect in terms of nanotwin relaxation. The mechanism yields a very high damping of presently unknown frequency dependence. Finely dispersed martensite–martensite composites also display high damping of 11% peak as has been detected in differently structured double layer Ni–Ti shape memory films. The microstructure thus created appears to give rise to the high damping via martensite–martensite interactions. A phenomenological model using a Landau approach supports this assumption.
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