Endowing low fatigue for elastocaloric effect by refined hierarchical microcomposite in additive manufactured NiTiCuCo alloy

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外文摘要：NiTiCu-based shape memory alloys have been considered as ideal materials for solid-state refrigeration due to their superb cycling stability for elastocaloric effect.However,the embrittlement and deterioration caused by secondary phase and coarse grains restrict their applications,and it is still challenging since the geometric components are required.Here,bulk NiTiCuCo parts with excellent forming quality were fabricated by laser powder bed fusion(LPBF)technique.The as-fabricated alloy exhibits refined three-phases hierarchical microcomposite formed based on the rapid cooling mode of LPBF,composed of intricate dendritic Ti2Ni-NiTi composite and nano Ti2Cu embedded inside the NiTi-matrix.This configuration endows far superior elastocaloric stability compared to the as-cast counterpart.The low fatigue stems from the strong elastic coupling between the interphases with reversible martensite transformation,revealed by in-situ synchrotron high-energy x-ray diffraction.The fabrication of NiTiCuCo alloy via LPBF fills the bill of complex geometric structures for elastocaloric NiTiCu alloys.The understanding of interphase micro-coupling could provide the guide for designing LPBF fabricated shape memory-based composites,enabling their applications for special demands on other functionalities.

外文关键词：

NiTiCuCoshape memory alloymicrocompositehigh-energy x-ray diffractionlaser powder bed fusion

作者：

Bo Feng、Helong Liu、Ying Yang、Hui Shen、Yang Ren、Yinong Liu、Lishan Cui、Bingmin Huang、Shijie Hao

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作者单位：

College of New Energy and Materials,China University of Petroleum,Beijing 102249,People's Republic of China

College of Chemical Engineering and Environment,China University of Petroleum,Beijing 102249,People's Republic of China

Department of Physics,City University of Hong Kong,83 Tat Chee Avenue,Kowloon,Hong Kong Special Administrative Region of China,People's Republic of China

Department of Mechanical Engineering,The University of Western Australia,Perth,WA 6009,Australia

Jiangsu Smart Advanced Material Tech Co.,Ltd,Xuzhou 221000,People's Republic of China

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基金：

National Key R&D Program of ChinaNational Safety Academic FundNational Safety Academic FundNSFCNSFCUS Department of Energy,Office of Science and Office of Basic Energy Science

项目编号：

2022YFB4600500U2130201U23301055220121451971244DE-AC02-06CH11357

出版年：

2024

DOI：

10.1088/2631-7990/ad35ff

极端制造(英文)

CSTPCDEI

ISSN：

年,卷(期)：2024.6(4)