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

• 作者: Kai Liu Hai Zeng Ji Qi Xiaohua Luo Xuanwei Zhao Xianming Zheng Yuan Yuan Changcai Chen Shengcan Ma Ren Xie Bing Li Zhenchen Zhong
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2021,（14）
• 页码范围: 76-82
• 页数: 7页
• 语种: 英文

摘要

Solid-state refrigeration based on the magneto-or mechano-caloric effect,including elasto-and barocaloric 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 △p=0.1-100MPa can be as high as △TMaxad=7.7 K (△TMaxad / △preaches up to ～7.7 K kbar 1),surpassing the △TMaxad/△pvalue 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.