Microstructure and Phase Transformation Behavior of NiTiCu Shape Memory Alloys Produced Using Twin-Wire Arc Additive Manufacturing

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外文摘要：NiTiCu thin walls were produced by twin-wire arc additive manufacturing(T-WAAM)using commercial NiTi and Cu wires as the feedstock materials.This approach aims to solve the problems typically associated with large phase transformation hysteresis in NiTi shape memory alloys.The microstructure,mechanical properties,and phase transformation behavior of the as-deposited NiTiCu alloy were comprehensively examined.The results re-vealed that the as-deposited NiTiCu alloy was well-formed,with its microstructure showed columnar,equiaxed,and needle-like grains,depending on the location within the deposited walls.The microhardness gradually in-creased from the first to the third layer.The Cu content was 20.80 at％,and Cu-based precipitates were formed in the as-deposited NiTiCu.The volume fractions and lattice parameters of the matrix and precipitates in the as-deposited NiTiCu material were analyzed using high-energy synchrotron X-ray diffraction.The martensitic phase was identified as a B19 crystal structure,and the as-deposited NiTiCu underwent a one-step B2-B19 phase transformation.The tensile strength and fracture strain were approximately 232 MPa and 3.72％,respectively.In particular,the addition of Cu narrowed the phase transformation hysteresis of the as-deposited NiTiCu alloy from 24.4 to 7.1 ℃ compared with conventional binary NiTi alloys.This study expands the potential of T-WAAM in modifying the phase transformation behavior of NiTi-based ternary alloys.

外文关键词：

Twin-wire arc additive manufacturingNiticu alloysMicrostructurePhase transformationSynchrotron radiation

作者：

Long Chen、Jo?o Pedro Oliveira、Xi Yan、Bowen Pang、Wenchao Ke、Jiajia Shen、Fissha Biruke Teshome、Norbert Schell、Naixun Zhou、Bei Peng、Zhi Zeng

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作者单位：

School of Mechanical and Electrical Engineering,University of Electronic Science and Technology of China,Chengdu,611731,China

CENIMAT/I3N,Department of Materials Science,NOVA School of Science and Technology,Universidade NOVA de Lisboa,Caparica,2829-516,Portugal

UNIDEMI,Department of Mechanical and Industrial Engineering,NOVA School of Science and Technology,Universidade NOVA de Lisboa,Caparica,2829-516,Portugal

Institute of Materials Physics,Helmholtz-Zentrum Hereon,Max-Planck-Str.1,Geesthacht,D-21502,Germany

Institute of Electronic and Information Engineering,University of Electronic Science and Technology of China,Dongguan,523808,China

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基金：

National Natural Science Foundation of ChinaScience and Technology Project of Sichuan ProvinceScience and Technology Project of Sichuan ProvinceGuangdong Basic and Applied Basic Research Foundationnational funds from Funda??o para a Ci€ncia e a Tecnologia(FCT),I.Pscope of the Associate Laboratory Institute of Nanostructures,Nanomodelling,and Nanofabricationi3Nscope of the Associate Laboratory Institute of Nanostructures,Nanomodelling,and Nanofabricationi3Nscope of the Associate Laboratory Institute of Nanostructures,Nanomodelling,and Nanofabricationi3NDESY(Hamburg,Germany)CALIPSOplus from the EU Framework Programme for Research and Innovation HORIZON 2020

项目编号：

5217529223NSFJQ00642022YFQ00582021B1515140048LA/P/0037/2020UIDP/50025/2020UIDB/50025/2020730872

出版年：

2024

DOI：

10.1016/j.amf.2024.200132

中国机械工程学报:增材制造前沿(英文)

ISSN：

年,卷(期)：2024.3(2)