1. Low-fatigue and large room-temperature elastocaloric effect in a bulk Ti[formula omitted]Ni[formula omitted]Cu[formula omitted] alloy.
- Author
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Dang, Pengfei, Ye, Fan, Zhou, Yumei, Ding, Lei, Pang, Jianbo, Zhang, Lei, Ding, Xiangdong, Sun, Jun, Dai, Sheng, Lookman, Turab, and Xue, Dezhen
- Subjects
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MARTENSITIC transformations , *ADIABATIC temperature , *ALLOYS , *GRAIN refinement , *DEBYE temperatures , *TITANIUM alloys - Abstract
[Display omitted] Large-scale applications of elastocaloric cooling demand bulk materials showing both large adiabatic temperature change (Δ T a d ) and low-fatigue characteristics at room temperature. Using cold-rolling and aging treatment, we synthesize a bulk Ti 49.2 Ni 40.8 Cu 10 polycrystalline alloy that has microstructural features of nanocrystallinity and epitaxially related Ti(Ni,Cu) 2 nanoprecipitates. It exhibits a large Δ T a d of 13.8 K and a coefficient of performance of 13 at room temperature. Moreover, the degradation of Δ T a d is only 0.3 K after 450 tensile cycles. We attribute the favorable properties to the enhanced reversibility of martensitic transformation during stress cycling, aided by the internal epitaxy-generated stress at the interface between the Ti(Ni,Cu) 2 nanoprecipitates and matrix, together with grain refinement. The results indicate that the alloy offers a good balance of multiple objectives, holding promise for solid-state refrigeration applications. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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