Journal
ACTA MATERIALIA
Volume 60, Issue 6-7, Pages 3168-3175Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2012.02.022
Keywords
Metamagnetic shape memory alloys (MSMAs); Martensitic phase transformation; Thermodynamics; Transformation entropy
Funding
- FEDER
- Spanish Ministerio de Ciencia y Tecnologia [MAT2009-07928, MAT-2008-01587]
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The magnetic contribution to the martensitic transformation entropy change plays a crucial role in the transition properties of meta-magnetic shape memory alloys. This contribution leads to a common dependence of the total entropy change at the structural transformation, Delta S-tr, on the normalized temperature difference delta(tr)(A) = (T-C(A) - T-tr)/T-C(A) (where T-C(A) is the Curie temperature of the austenitic phase and T-tr is the transformation temperature) whose main feature is a decrease in Delta S-tr with increasing delta(tr)(A). A phenomenological model based on a Bragg-Williams approximation has been proposed to describe the observed behaviour in terms of the evolution of the magnetic contribution to the total entropy change. The proposed approximation provides a good fitting between predicted and experimental entropy changes obtained for different Ni-Mn-based alloy systems. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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