J. Mater. Sci. Technol. ›› 2021, Vol. 73: 76-82.DOI: 10.1016/j.jmst.2020.09.022

• Research Article • Previous Articles     Next Articles

Microstructure and giant baro-caloric effect induced by low pressure in Heusler Co51Fe1V33Ga15 alloy undergoing martensitic transformation

Kai Liua,b,c, Hai Zenga,b, Ji Qid,e, Xiaohua Luoa, Xuanwei Zhaoa,b, Xianming Zhenga,b, Yuan Yuana,b, Changcai Chena, Shengcan Maa,*(), Ren Xief, Bing Lid,e, Zhenchen Zhonga   

  1. aJiangxi Key Laboratory for Rare Earth Magnetic Materials and Devices/Institute for Rare Earth Magnetic Materials and Devices (IREMMD), College of Rare Earths, Jiangxi University of Science and Technology, Ganzhou, 341000, China
    bSchool of Materials Science and Engineering, Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, 341000, China
    cHenan Key Laboratory of Photovoltaic Materials and School of Physics & Electronics, Henan University, Kaifeng, 475004, China
    dShenyang National Laboratory (SYNL) for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
    eSchool of Materials Science and Engineering, University of Science and Technology of China, Hefei, China
    fGuizhou Province Key Laboratory for Photoelectrics Technology and Application, College of Physics, Guizhou University, Guiyang, 550025, China
  • Received:2020-07-16 Revised:2020-09-05 Accepted:2020-09-19 Published:2021-05-20 Online:2020-10-03
  • Contact: Shengcan Ma
  • About author:*E-mail address: mashengcan@jxust.edu.cn (S. Ma).

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 Co51Fe1V33Ga15 Heusler alloy. The maximum adiabatic temperature change under the applied pressure change of Δp = 0.1-100 MPa can be as high as $\Delta T_{\text{ad}}^{Max}$= 7.7 K ($\Delta T_{\text{ad}}^{Max}$/Δpreaches up to ∼7.7 K kbar-1), surpassing the $\Delta T_{\text{ad}}^{Max}$/Δpvalue 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.

Key words: Solid-state refrigeration, Barocaloric effect, Adiabatic temperature change, Isostatic pressure, Martensitic transformation, Co51Fe1V33Ga15 alloy