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Title: Elastocaloric effect with a broad temperature window and low energy loss in a nanograin Ti-44Ni-5Cu-1Al (at%) shape memory alloy
Author: Chen, Hong
Xiao, Fei
Zhun, Li
Jin, Xuejun
Mañosa, Lluís
Planes Vila, Antoni
Keywords: Aliatges
Anàlisi tèrmica
Thermal analysis
Issue Date: 26-Jan-2021
Publisher: American Physical Society
Abstract: Superelastic Ti-Ni-based shape memory alloys are promising elastocaloric materials for solid-state refrigeration. In this paper, we studied the mechanical properties and elastocaloric effect of a severely cold rolled Ti-44Ni-5Cu-1Al (at.%) alloy composed of nanograins (∼5-16 nm). The alloy exhibits partial stress-induced martensitic transformation with a large quasilinear reversible strain of ∼3.4 % and a small energy dissipation of ∼1.6 MJ/m3 when a maximum stress of 1 GPa is applied. The temperature decrease induced by adiabatic removal of a stress of 1 GPa is of about −5 K, which is mainly due to the reverse transition occurring during unloading. The effective working temperature window of elastocaloric effect larger than 200 K. The coefficient of performance of this alloy reaches ∼13, which is higher than values reported so far for Ti-Ni alloys.
Note: Reproducció del document publicat a:
It is part of: Physical Review Materials, 2021, vol. 5, p. 015201
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ISSN: 2475-9953
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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