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Microstructure and mechanical properties of Ti basic bionic gradient heterogeneous alloy prepared by multi-wire arc additive manufacturing

Jiang, PF; Li, XR; Zong, XM; Wang, XB; Chen, ZK; Liu, CZ; Gao, NK; (2022) Microstructure and mechanical properties of Ti basic bionic gradient heterogeneous alloy prepared by multi-wire arc additive manufacturing. Journal of Alloys and Compounds , 926 , Article 166813. 10.1016/j.jallcom.2022.166813. Green open access

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Journal of Alloys and Compounts-Microstructure of Multi-wire arc AM Ti Alloys-Zhihui Zhang.pdf - Accepted Version

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Abstract

Inspired by biological gradient structure, Ti basic gradient heterogeneous alloy component from TC11 alloy to TC4 alloy was fabricated by multi-wire arc additive manufacturing (MWAAM). The chemical mixing, phase and microstructure evolution, microhardness distribution and tensile property of Ti basic gradient heterogeneous alloy were investigated through EDS, XRD, SEM, hardness tester and tensile tester. The results indicated that the alloy elements formed a long-distance gradient concentration distribution during the transition between two different titanium alloys due to dilution, remelting, and convective mixing in the molten pool. The intensity of diffraction peaks of Ti basic gradient heterogeneous alloy in the gradient region had no obvious change. The microstructure of MWAAM Ti basic gradient heterogeneous alloy was mainly consisted of lamellar αP, acicular αS, equiaxed αS and β matrix. Different morphology of the αS phase was mainly attributed to the wetting state of the second solid phase and grain boundary. In addition, the microstructure of α phase in Ti basic gradient heterogeneous alloy was significantly changed by the gradient distribution of alloy composition. The gradient heterogeneous alloy component manufactured in this work had high bonding strength. The average UTS of MWAAM Ti basic gradient heterogeneous alloy was 793.14 MPa, which was close to MWAAM TC4 alloy and reached approximately 85% of MWAAM TC11 alloy.

Type: Article
Title: Microstructure and mechanical properties of Ti basic bionic gradient heterogeneous alloy prepared by multi-wire arc additive manufacturing
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jallcom.2022.166813
Publisher version: https://doi.org/10.1016/j.jallcom.2022.166813
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: Dual-titanium alloy, Gradient heterogeneous structure, Multi-wire arc additive manufacturing, Microstructure evolution, Mechanical property
UCL classification: 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 > Department of Ortho and MSK Science
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci
URI: https://discovery.ucl.ac.uk/id/eprint/10154745
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