材料科学
无扩散变换
绝热过程
合金
形状记忆合金
磁制冷
马氏体
微观结构
制冷
热力学
凝聚态物理
冶金
磁化
磁场
量子力学
物理
作者
Dong Liu,Zongbin Li,Xiaoliang Zhang,Cong Liu,Guoyao Zhang,Jiajing Yang,Bo Yang,Haile Yan,Daoyong Cong,Xiang Zhao,Liang Zuo
标识
DOI:10.1021/acsami.1c22235
摘要
High-performance elastocaloric materials are highly sought in developing energy-efficient and environmentally friendly solid-state elastocaloric refrigeration. Here, we present an effective strategy to achieve a giant elastocaloric response by enlarging the lattice volume change ΔV/V0 upon the martensitic transformation. Using the Ni50Mn50 binary alloy as the prototype, a large transformation entropy change ΔStr can be tailored in the vicinity of room temperature by simultaneously doping Cu and Ga. Especially, the |ΔStr| values in the ⟨001⟩A-textured Ni30Cu20Mn39.5Ga10.5 and Ni30Cu20Mn39Ga11 alloys prepared by directional solidification can be as large as 47.5 and 46.7 Jkg-1 K-1, respectively, due to the significant ΔV/V0 values, i.e., 1.81 and 1.82%, respectively. Such enhanced ΔStr values thus yield giant ΔTad values of up to -23.5 and -19.3 K on removing the compressive stress in these two alloys, being much higher than those in Heusler-type alloys reported previously. Moreover, owing to the relatively low driving stress endowed by the highly textured microstructure, the specific adiabatic temperature change (|ΔTad/Δσmax|) in the present work can be as large as 77.2 K/GPa. This work is expected to provide new routes in designing high-performance elastocaloric materials with the combination of a giant elastocaloric response and low driving stress.
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