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| Influence of cooling rate on magneto-structural transition and magnetocaloric effect of Ni30Cu8Co12Mn37Ga13 alloy |
| Zhu-jun Jiang1,Yu-ye Wu1,2,Jing-min Wang1,Cheng-bao Jiang1 |
1 School of Materials Science and Engineering, Beihang University, Beijing 100191, China
2 School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China |
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Abstract 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 (��Smag) derived from magnetic field induced martensitic transformation is confirmed for both samples, and can be remarkably enhanced by the atomic ordering. The largest ��Smag of 20.9 J/(kg��K) is obtained at 307.5 K under 5 T in the FC sample.
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Received: 06 January 2017
Published: 07 July 2017
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| Fund:National Natural Science Foundations of China;National Natural Science Foundations of China;National Natural Science Foundations of China;National Natural Science Foundations of China |
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2017, Vol. 24 
