文献类型：期刊文献

英文题名：Low-fatigue and large room-temperature elastocaloric effect in a bulk Ti49.2Ni40.8Cu10 alloy

作者：Dang, Pengfei[1];Ye, Fan[2,3];Zhou, Yumei[1];Ding, Lei[1];Pang, Jianbo[1];Zhang, Lei[1];Ding, Xiangdong[1];Sun, Jun[1];Dai, Sheng[2,3];Lookman, Turab[4];Xue, Dezhen[1]

机构：[1]Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China;[2]East China Univ Sci & Technol, Inst Fine Chem, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Inst Fine Chem, Sch Chem & Mol Engn, Feringa Nobel Prize Scientist Joint Res Ctr, Shanghai 200237, Peoples R China;[4]AiMat Res LLC, Santa Fe, NM 87501 USA

年份：2022

卷号：229

外文期刊名：ACTA MATERIALIA

收录：;EI(收录号：20221111781510);WOS:【SCI-EXPANDED(收录号:WOS:000791245100002)】；

基金：The authors gratefully acknowledge the support of National Natural Science Foundation of China (Grant nos. 51931004 , 52173228 and 51571156) , National Key Research and Develop-ment Program of China (2021YFB3802102) , the 111 project 2.0 (BP2018008) , Shanghai Rising-star Program (20QA140214100) , the Fundamental Research Funds for the Central Universities and Pro-fessor of Special Appointment (Eastern Scholar) at Shanghai Insti-tutions of Higher Learning. We thank Dr. J. Li, Dr. Y. Zhang and Dr. C. Li at the Instrument Analysis Center of XJTU for their assistance of TEM analysis.

语种：英文

外文关键词：Elastocaloric effect; Functional fatigue; Martensitic transformation; Epitaxial stress; Nanoprecipitates

摘要：Large-scale applications of elastocaloric cooling demand bulk materials showing both large adiabatic temperature change (delta T-ad) and low-fatigue characteristics at room temperature. Using cold-rolling and aging treatment, we synthesize a bulk Ti49. 2Ni40. 8Cu10 polycrystalline alloy that has microstructural features of nanocrystallinity and epitaxially related Ti(Ni,Cu)(2) nanoprecipitates. It exhibits a large ATad of 13.8 K and a coefficient of performance of 13 at room temperature. Moreover, the degradation of delta T-ad 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.(C) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.