镍铁镓多晶合金弹热效应的循环稳定性研究  

Cycling stability of elastocaloric effect ina Ni_(53.6)Fe_(19.3)Ga_(27.1) polycrystalline alloy

作　　者：官磊 刘继辰 陈枫 佟运祥[2] GUAN Lei;LIU Jichen;CHEN Feng;TONG Yunxiang(Beijing Institute of Aeronautical Materials,Beijing 100095,China;International Joint Laboratory for Advanced Nanomaterials of Heilongjiang Province,College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]中国航发北京航空材料研究院,北京100095 [2]哈尔滨工程大学材料科学与化学工程学院,黑龙江省先进纳米材料联合实验室,哈尔滨150001

出　　处：《功能材料》2024年第7期7116-7121,7208,共7页Journal of Functional Materials

摘　　要：弹热制冷是一种新型固态制冷技术,具有对环境友好和能量利用效率高等优点,有望替代传统的蒸气压缩制冷技术。实现弹热制冷应用的关键在于获得兼具大弹热效应和高循环稳定性的弹热材料作为制冷剂。Ni-Fe-Ga记忆合金是一种很有潜力的弹热材料。该合金采用常规熔炼方法易形成γ相,然而有关γ相对合金弹热性能的影响却缺乏系统和深入的研究。有鉴于此,制备了一种含γ相的Ni_(53.6)Fe_(19.3)Ga_(27.1)多晶合金,采用X射线衍射仪、透射电子显微镜、差示扫描量热仪、电子万能材料试验机以及自制的弹热效应测试系统,分析了其显微组织、力学性能和弹热性能。结果表明,Ni_(53.6)Fe_(19.3)Ga_(27.1)多晶合金的基体是β相,γ相同时分布于晶粒内和晶界上,这种两相结构有助于合金获得大且稳定的弹热效应,室温绝热温变值超过-5 K。Elastocaloric cooling,as a typical solid-state refrigeration technology,is recognized as an alternative to the conventional vapor compression cooling due to the advantages of being environmentally friendly and high energy utilization efficiency.The key to develop elastocaloric cooling technology is to obtain high-performance elastocaloric materials with large elastocaloric effect(eCE)and high cyclic stability as the refrigerants.Ni-Fe-Ga shape memory alloy is regarded as a kind of promising elastocaloric material.The formation ofγsecondary phase is inevitable using conventional melting technique,however,systematic and in-depth studies on the effect ofγphase on the eCE of Ni-Fe-Ga alloys are scarce.For this purpose,Ni_(53.6)Fe_(19.3)Ga_(27.1)polycrystalline alloy is fabricated in this work and the microstructure,mechanical properties and eCE are studied by X-ray diffraction,transmission electron microscope,differential scanning calorimetry,universal testing machine,self-designed eCE experimental setup,etc.It shows that,in the present alloy,γphases are formed inside,and the grains and along the grain boundaries ofβphases.Such a dual-phased structure helps to achieve a considerable eCE with high cycling stability.The value of adiabatic temperature change exceeds-5 K.

关 键 词：镍铁镓 应力诱发马氏体相变 弹热效应 循环稳定性 显微组织 

分 类 号：TB34[一般工业技术—材料科学与工程]