Influence of cooling rate on magneto-structural transition and magnetocaloric effect of Ni30Cu8Co12Mn37Ga13 alloy

The influence of heat treatment with different cooling rates on phase transition behaviors and magnetocaloric effect is systematically studied. Difference in atomic order is induced by changing cooling rates, where ordered phase is obtained in the furnace cooled (FC) sample while disordered phase is...

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Bibliographic Details
Published inJournal of iron and steel research, international Vol. 24; no. 7; pp. 711 - 717
Main Authors Jiang, Zhu-jun, Wu, Yu-ye, Wang, Jing-min, Jiang, Cheng-bao
Format Journal Article
LanguageEnglish
Published Singapore Springer Singapore 01.07.2017
Subjects
Applied and Technical Physics
Engineering
Machines
Manufacturing
Materials Engineering
Materials Science
Metallic Materials
Physical Chemistry
Processes
Ferromagnetic shape
Heat treatment
Magnetocaloric effect
Cooling rate
Magneto-structural transition
memory alloy
Martensitic transformation
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Summary:The influence of heat treatment with different cooling rates on phase transition behaviors and magnetocaloric effect is systematically studied. Difference in atomic order is induced by changing cooling rates, where ordered phase is obtained in the furnace cooled (FC) sample while disordered phase is reserved in the water quenched (WQ) sample. The coupled magneto-structural transition is detected in both samples but the characteristic temperature significantly shifts to lower temperatures with increasing atomic order. Giant magnetic entropy change (Δ S mag ) derived from magnetic field induced martensitic transformation is confirmed for both samples, and can be remarkably enhanced by the atomic ordering. The largest Δ S mag of 20.9 J/(kg · K) is obtained at 307.5 K under 5 T in the FC sample.
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(17)30107-3