Journal
ENTROPY
Volume 16, Issue 5, Pages 2756-2767Publisher
MDPI
DOI: 10.3390/e16052756
Keywords
Ni-Mn-In-Co; entropy change; atomic order; martensitic transformation; metamagnetic shape memory alloys
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Funding
- Spanish Ministerio de Economia y Competitividad [MAT2011-28217 C02-01, MAT2012-37923 C02-01]
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The influence of the atomic order on the martensitic transformation entropy change has been studied in a Ni-Mn-In-Co metamagnetic shape memory alloy through the evolution of the transformation temperatures under high-temperature quenching and post-quench annealing thermal treatments. It is confirmed that the entropy change evolves as a consequence of the variations on the degree of L2(1) atomic order brought by thermal treatments, though, contrary to what occurs in ternary Ni-Mn-In, post-quench aging appears to be the most effective way to modify the transformation entropy in Ni-Mn-In-Co. It is also shown that any entropy change value between around 40 and 5 J/kgK can be achieved in a controllable way for a single alloy under the appropriate aging treatment, thus bringing out the possibility of properly tune the magnetocaloric effect.
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