Microstructure and giant baro-caloric effect induced by low pressure in Heusler Co51Fe1V33Ga15 alloy undergoing martensitic transformation. (20th May 2021)

• Record Type: Journal Article
• Authors: Liu, Kai; Zeng, Hai; Qi, Ji; Luo, Xiaohua; Zhao, Xuanwei; Zheng, Xianming; Yuan, Yuan; Chen, Changcai; Ma, Shengcan; Xie, Ren; Li, Bing; Zhong, Zhenchen
• Is Part Of: Journal of materials science & technology. Volume 73(2021)
• Page Start: 76
• Page End: 82
• Publication Date: 2021-05-20
• Subjects: Solid-state refrigeration -- Barocaloric effect -- Adiabatic temperature change -- Isostatic pressure -- Martensitic transformation -- Co51Fe1V33Ga15 alloy; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2020.09.022
• Languages: English
• ISSNs: 1005-0302

Abstract

Graphical abstract: Highlights: Co51 Fe1 V33 Ga15 Heusler alloy with large lattice entropy change is successfully fabricated. Giant baro-caloric effect induced by low hydrostatic pressure near room temperature is obtained. The Δ T ad M a x / Δ p value in this work surpasses those values reported hitherto in baro-caloric alloys. V-rich particles with the submicron scale are observed, which are believed to account for enhancing mechanical properties. Co-Fe-V-Ga system is promising in the applications of solid-state refrigeration and heat pump. Abstract: Solid-state refrigeration based on the magneto- or mechano-caloric effect, including elasto- and baro-caloric in ferroic phase transition materials is promising to replace the current vapor compression refrigeration in consideration of environmental-friendliness and energy-saving. However, both high driven field and small thermal changes in all of these caloric materials hinder the development of solid-state refrigeration. Here we report a giant baro-caloric effect near room temperature induced by a low hydrostatic pressure in Co-based Co51 Fe1 V33 Ga15 Heusler alloy. The maximum adiabatic temperature change under the applied pressure change of Δ p = 0.1–100 MPa can be as high as Δ T ad M a x = 7.7 K ( Δ T ad M a x / Δ p reaches up to ∼7.7 K kbar −1 ), surpassing the Δ T ad M a x / Δ p value reported hitherto in baro-caloric alloys. In addition, the microstructure is also studied by using the electron microscopes. Along with the austenite and martensite, the submicron V-rich particles are precipitated in this alloy, which are believed to account for enhancing mechanical properties.