Paper Title:
Entropy Changes in Ferromagnetic Shape Memory Alloys
  Abstract

Several features of the entropy change S related to the martensitic transformation (MT) in metamagnetic alloys are discussed. In these alloys a change in magnetic order is concomitant with the MT, as it occurs between ferromagnetic austenite and non-magnetic (weakly magnetic) martensite. In this case it has been shown that S strongly decreases as the MT temperature range go far below the Curie temperature of austenite. The behavior of S can be understood considering the different signs of the lattice and magnetic contributions to the total entropy change. It has been shown that the so called kinetic arrest of the MT is directly related to the decrease of S, which in the limit S → 0 leads to the suppression of the driving force for the transformation.

  Info
Periodical
Edited by
V.A. Chernenko
Pages
49-60
DOI
10.4028/www.scientific.net/MSF.684.49
Citation
E. Cesari, D. Salas, S. Kustov, "Entropy Changes in Ferromagnetic Shape Memory Alloys", Materials Science Forum, Vol. 684, pp. 49-60, 2011
Online since
May 2011
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