Abstract
Abstract The e reversible transformation has been studied in Fe-14 wt.% Mn and Fe-21 wt.% Mn alloys which are known to exhibit a weak shape memory effect. The internal friction changes and the associated elastic modulus changes were measured using the high frequency (40 kHz) composite oscillator technique in the temperature range 20–350°C in which the e transformation occurs. The strain-induced amplitude dependent internal friction was measured in order to evaluate changes in the dislocation structure that occur during the transformations and to identify the transformation mechanism involved. The study revealed that the propagation of the e/γ interface boundary during the e γ transformation is a thermally activated relaxation process obeying the Debye relaxation equation. The internal friction data were used to determine the activation energy of the process responsible for the martensitic transformation. The damping peak is observed at temperatures where both phases coexist and is due to the motion ...
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