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Multi-wire arc additive manufacturing of TC4-Nb-NiTi bionic layered heterogeneous alloy: Microstructure evolution and mechanical properties

Jiang, PF; Nie, MH; Teng, JZ; Liu, CZ; Zhang, ZH; (2023) Multi-wire arc additive manufacturing of TC4-Nb-NiTi bionic layered heterogeneous alloy: Microstructure evolution and mechanical properties. Materials Characterization , 202 , Article 113001. 10.1016/j.matchar.2023.113001. Green open access

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Abstract

Additive manufacturing of TC4-NiTi alloy components posed many challenges due to the significant differences in their material properties. No previous literature has been found to study bonding characteristics of TC4-NiTi interface fabricated via multi-wire arc additive manufacturing (MWAAM). This paper introduces the preparation of TC4-Nb-NiTi bionic layered heterogeneous structure alloy components using MWAAM with Nb as the interlayer. The results indicated that phase composition from TC4 region to NiTi region as follows: α-Ti + β-Ti → α-Ti + β-Ti + (Nb, Ti) → NiTi + NiTi2 + Ni3Ti + α-Ti + (Nb, Ti) → NiTi + Ni3Ti. The microstructure of TC4 alloy side gradually refined with the increase of Nb content, while Nb and NiTi formed a eutectic structure at the interface. The maximum microhardness of MWAAM TC4-Nb-NiTi alloy component was 393.3 HV. The ultimate compressive strength (1419.87 MPa) and fracture strain (22.12%) for MWAAM TC4-Nb-NiTi sample was obtained. The ultimate tensile stress and the elongation of MWAAM TC4-Nb-NiTi sample were 378.8 MPa and 3.09%, respectively. The fracture mode of tensile samples was a mixed fracture dominated by brittle fracture.

Type: Article
Title: Multi-wire arc additive manufacturing of TC4-Nb-NiTi bionic layered heterogeneous alloy: Microstructure evolution and mechanical properties
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.matchar.2023.113001
Publisher version: https://doi.org/10.1016/j.matchar.2023.113001
Language: English
Keywords: Science & Technology, Technology, Materials Science, Multidisciplinary, Metallurgy & Metallurgical Engineering, Materials Science, Characterization & Testing, Materials Science, TC4-Nb-NiTi alloy, Multi-wire arc additive manufacturing, Microstructure evolution, Compression behavior, Tensile property, WIRE, NITI
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci > Department of Ortho and MSK Science
URI: https://discovery.ucl.ac.uk/id/eprint/10172973
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