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

Jiang, PF; Nie, MH; Teng, JZ; Wang, XB; Liu, CZ; Zhang, ZH; (2023) Multi-wire arc additive manufacturing of TC4/Nb bionic layered heterogeneous alloy: Microstructure evolution and mechanical properties. Materials Science and Engineering A , 874 , Article 145076. 10.1016/j.msea.2023.145076. Green open access

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Abstract

The performance improvement of wire arc additive manufacturing component relies on structural innovation and tailored printing, and the naturally optimized structure can provide inspiration for design and manufacturing. In this work, a layered TC4/Nb multi-material alloy component inspired by the biological structure of the Crysomallon squamiferum shell was designed and fabricated by multi-wire arc additive manufacturing (MWAAM). The interfacial reaction, phase composition, microstructure evolution, crystal growth, mechanical properties and crack propagation of MWAAM-processed bionic heterogeneous TC4/Nb multi-material alloy component were investigated by EDS, SEM, EBSD and mechanical tester. The results indicated that the good metallurgical bond was formed between the different layers of MWAAM TC4/Nb multi-material alloy sample. The Ti/Nb multi-material alloy component was mainly composed of α-Ti, β-Ti and (Nb, Ti) solid solution phases. The morphology of phase underwent a continuous transformation process from TC4 layer to G1 layer with the increase of Nb content: Lamellar α + β →Thin lamellar α + Short rod α + β → Acicular α + β → Thin acicular α + β. In addition, the grain size of TC4/Nb multi material alloy component from TC4 layer to G2 layer gradually from 3.534 μm decreased to 2.904 μm with the increase of Nb content. The microhardness of TC4/Nb multi-material alloy from TC4 layer to G2 layer ranged from 404.04 HV to 245.23 HV. The relatively high compression strength and ultimate tensile strength of TC4/Nb multi-material alloy sample were 2162.64 ± 26 MPa and 663.39 MPa, and corresponding strain were 31.99% and 17.77%, respectively. The excellent mechanical behavior was mainly contributed to the excellent combination of gradient transition of grain size and microstructure evolution between layers. Crack propagation was mainly dominated by crack deflection and multistage cracking during the tensile test process. The strength of TC4 layer was the highest than G1 and G2 layer in the TC4/Nb multi-material alloy component.

Type: Article
Title: Multi-wire arc additive manufacturing of TC4/Nb 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.msea.2023.145076
Publisher version: https://doi.org/10.1016/j.msea.2023.145076
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: TC4/Nb alloy, Multi-material structure, Multi-wire arc additive manufacturing, Microstructure evolution, Mechanical properties
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/10171354
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