期刊
ACTA MATERIALIA
卷 210, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2021.116849
关键词
Magnetocaloric effect; Shape memory alloy; Nonvolatile strain; Hysteresis; Refrigeration
资金
- National Natural Science Foundation of China [51471127, 51931004, 51431007, 91963111]
- Key Scientific and Technological Innovation Team of Shaanxi province [2020TD-001]
- Innovation Capability Support Program of Shaanxi [2018PT-28, 2017KTPT-04]
- Fundamental Research Funds for the Central Universities (China)
- World-Class Universities (Disciplines)
- Characteristic Development Guidance Funds for the Central Universities
In this study, a new composite material was designed to successfully tune the magnetocaloric effect of Mn1.95Cr0.05Sb0.95Ga0.05 using a Ti50Ni50 substrate, despite its low stress sensitivity. By varying the residual strains of the Ti50Ni50 substrate, a wide working temperature window was obtained at a low magnetic field, with constant refrigeration capacity and small hysteresis under different stress conditions, promoting homogeneous heat transfer and improving efficiency.
The multiferroic composites with a layer of magnetocaloric materials (MCMs) on a piezoelectric substrate have recently been developed to tune the magnetocaloric effect (MCE) through the stress from the piezoelectric substrate, which could help achieve high-efficiency and miniaturized refrigeration. The small strain of piezoelectric substrates is sufficient to tune the MCE of alloys whose transformation temperature (T-M) is sensitive to the external stress. However, it might not work effectively for those stress-insensitive MCMs, which are also important MCMs with considerable MCE and small hysteresis. In this paper, we design a new composite with a Mn1.95Cr0.05Sb0.95Ga0.05 ribbon on a Ti50Ni50 shape-memory-alloy substrate. The Ti50Ni50 substrate can provide much larger nonvolatile stress than a piezoelectric substrate, which thus successfully tunes the MCE of the Mn1.95Cr0.05Sb0.95Ga0.05, despite its low stress sensitivity. With a 2% residual strain of the Ti50Ni50 substrate, T-M of the Mn1.95Cr0.05Sb0.95Ga0.05 is increased by similar to 6 K, which similar to 7.5 times that (0.8 K) achieved via a Mn1.95Cr0.05Sb0.95Ga0.05/PMN-PT composite. With different residual strains of Ti50Ni50 substrate from 0% to 2%, a wide working temperature window of 31 K is obtained at a low magnetic field of 1 T. Moreover, this composite exhibits an almost constant refrigeration capacity and a small hysteresis of 4.9 K under different stress, which promotes homogeneous heat transfer and improves the working efficiency. This work provides an effective method to tune the MCE of both stress-sensitive and stress-insensitive MCMs, which could be used in miniaturized refrigerators. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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