Elastocaloric cooling using shape memory alloy films

13th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Ossmer, H.^1 ; Chluba, C.^2 ; Krevet, B.^1 ; Quandt, E.^2 ; Rohde, M.^3 ; Kohl, M.^1

Karlsruhe Institute of Technology, IMT, PO Box 3640, 76021 Karlsruhe, Germany^1

Christian Albrecht University Kiel, Institute for Material Science, 24143 Kiel, Germany^2

Karlsruhe Institute of Technology, IAM, PO Box 3640, 76021 Karlsruhe, Germany^3

关键词: Adiabatic conditions;    BULK SPECIMENS;    Maximum temperature;    Rapid cooling;    Surface-to-volume ratio;    Tensile loading;    Transfer time;    Uniaxial tensile test;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/476/1/012138/pdf
DOI  :  10.1088/1742-6596/476/1/012138

来源: IOP

【 摘 要 】

The elastocaloric effect in magnetron-sputtered Ni50.4Ti49.6films of 20 μm thickness is studied by means of uniaxial tensile tests and infrared thermography. For the investigated films, the usable quantity of latent heat is about 7.2 J/g. When relieving the stress after tensile loading and subsequent temperature equalization at strain rates larger than dΕ/dt 0.2 s-1, a maximum temperature change of ΔT -16 K is observed as expected for adiabatic conditions. Compared to bulk specimens, the heat transfer times are reduced to about 850 ms due to the larger surface-to-volume ratio, which is attractive for rapid cooling.