? 2022 Elsevier B.V.Large lattice distortion is the design idea to obtain a high elastocaloric effect of shape memory alloys. In the present work, a new method of He ion irradiation is used to obtain a large lattice distortion, resulting in a 6.5 K of adiabatic temperature in Ti-Ni microwires, compared to the 2.9 K of the unirradiated sample. In addition, the isothermal entropy change is 68 J/kg·K at 293 K, which is twice as high as that of unirradiated alternatives. The microwires have a larger unit cell lattice distortion after irradiation across the stress-induced martensite transformation, therefore, the irradiated sample has a larger lattice entropy change, resulting in the improvement of the phase transformation entropy change. This is the main reason that the elastocaloric effect of Ti-Ni shape memory microwires is significantly improved after He ion irradiation. This method will provide a new idea for the design of colossal elastocaloric effect materials and provide the possibility for the application of solid-state refrigeration.
Elastocaloric effectHe ion irradiationLattice distortionMartensitic transformationTi-Ni shape memory wire
Sun S.、Gao Z.、Cai W.、Wang H.、Gao Y.、Cao X.、Zhao D.、Zhao Y.、Ning R.、Li H.
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School of Materials Science and Engineering Harbin Institute of Technology
College of Nuclear Equipment and Nuclear Engineering YanTai University
State Key Laboratory of Nuclear Physics and Technology Peking University
Key Laboratory of Nuclear Energy Technology Institute of High Energy Physics of the Chinese Academy of Science
Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education National Engineering Research Center for Inland Waterway Regulation School of River and Ocean Engineering Chongqing Jiaotong University
NSTL
Elsevier
