Temperature dependence of elastocaloric effect in a microstructurally graded NiTi alloy

The temperature dependence of elastocaloric cooling properties of a NiTi alloy with a grain size gradient, which was obtained by cold rolling and subsequent laser surface annealing, was evaluated and compared with those of coarse-grained and as-rolled NiTi. Results show that the adiabatic temperatur...

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Main Authors: Chen, Junyu, Wang, Wenqiang, Zhang, Qi, Lei, Liping, Ramamurty, Upadrasta, Fang, Gang
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2024
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Online Access:https://hdl.handle.net/10356/180254
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1802542024-09-25T05:31:58Z Temperature dependence of elastocaloric effect in a microstructurally graded NiTi alloy Chen, Junyu Wang, Wenqiang Zhang, Qi Lei, Liping Ramamurty, Upadrasta Fang, Gang School of Mechanical and Aerospace Engineering Institute of Materials Research and Engineering, A*STAR Engineering Shape memory alloys Functionally graded materials The temperature dependence of elastocaloric cooling properties of a NiTi alloy with a grain size gradient, which was obtained by cold rolling and subsequent laser surface annealing, was evaluated and compared with those of coarse-grained and as-rolled NiTi. Results show that the adiabatic temperature change (|ΔTad|) and cooling efficiency of the gradient-structured NiTi are significantly enhanced over a wider temperature span (Tspan), making it a superior elastocaloric refrigerant candidate. Detailed analyses show that while the fine grains present in the core of NiTi sheets reduce the global martensitic autocatalytic nucleation potency and increase strength to broaden Tspan, the coarser grains near the surfaces accommodate interlayer deformation to improve |ΔTad|. The work provides a method for overcoming the trade-off between cooling capacity and service temperature span of elastocaloric materials. Agency for Science, Technology and Research (A*STAR) This work was supported by the National Key Research and Development Program of China (No. 2017YFB0701801). The work at Nanyang Technological University was supported by the Agency for Science, Technology and Research (A*STAR) of Singapore via the Structural Metal Alloys Programme (No. A18B1b0061). 2024-09-25T05:31:57Z 2024-09-25T05:31:57Z 2024 Journal Article Chen, J., Wang, W., Zhang, Q., Lei, L., Ramamurty, U. & Fang, G. (2024). Temperature dependence of elastocaloric effect in a microstructurally graded NiTi alloy. Scripta Materialia, 245, 116060-. https://dx.doi.org/10.1016/j.scriptamat.2024.116060 1359-6462 https://hdl.handle.net/10356/180254 10.1016/j.scriptamat.2024.116060 2-s2.0-85186770124 245 116060 en A18B1b0061 Scripta Materialia © 2024 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
Shape memory alloys
Functionally graded materials
spellingShingle Engineering
Shape memory alloys
Functionally graded materials
Chen, Junyu
Wang, Wenqiang
Zhang, Qi
Lei, Liping
Ramamurty, Upadrasta
Fang, Gang
Temperature dependence of elastocaloric effect in a microstructurally graded NiTi alloy
description The temperature dependence of elastocaloric cooling properties of a NiTi alloy with a grain size gradient, which was obtained by cold rolling and subsequent laser surface annealing, was evaluated and compared with those of coarse-grained and as-rolled NiTi. Results show that the adiabatic temperature change (|ΔTad|) and cooling efficiency of the gradient-structured NiTi are significantly enhanced over a wider temperature span (Tspan), making it a superior elastocaloric refrigerant candidate. Detailed analyses show that while the fine grains present in the core of NiTi sheets reduce the global martensitic autocatalytic nucleation potency and increase strength to broaden Tspan, the coarser grains near the surfaces accommodate interlayer deformation to improve |ΔTad|. The work provides a method for overcoming the trade-off between cooling capacity and service temperature span of elastocaloric materials.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Chen, Junyu
Wang, Wenqiang
Zhang, Qi
Lei, Liping
Ramamurty, Upadrasta
Fang, Gang
format Article
author Chen, Junyu
Wang, Wenqiang
Zhang, Qi
Lei, Liping
Ramamurty, Upadrasta
Fang, Gang
author_sort Chen, Junyu
title Temperature dependence of elastocaloric effect in a microstructurally graded NiTi alloy
title_short Temperature dependence of elastocaloric effect in a microstructurally graded NiTi alloy
title_full Temperature dependence of elastocaloric effect in a microstructurally graded NiTi alloy
title_fullStr Temperature dependence of elastocaloric effect in a microstructurally graded NiTi alloy
title_full_unstemmed Temperature dependence of elastocaloric effect in a microstructurally graded NiTi alloy
title_sort temperature dependence of elastocaloric effect in a microstructurally graded niti alloy
publishDate 2024
url https://hdl.handle.net/10356/180254
_version_ 1814047327613091840