Abstract
The internal friction spectrum of shape memory alloys, which undergo a thermo-elastic martensitic transformation, is composed of three terms: the intrinsic term IF Int, related to the damping properties of each phase, the phase transition term IF PT, due to the martensitic phase transformation itself, and the transitory term IF Tr, linked to the kinetic effects during the phase transition. Therefore, in order to use the martensitic transformation to design high damping materials, it is very useful to understand the microscopic origin of each term, and to obtain it separately. In this work, we present a methodology for the analysis of the three terms of the internal friction spectrum, in light of theoretical models and observed experimental behavior. Based on this analysis, we discuss several conditions for the use of shape memory alloys as high damping materials in practical applications.
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