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Microstructure and tribological properties of laser in-situ synthesized Ti3Al composite coating on Ti-6Al-4V

Microstructure and tribological properties of laser in-situ synthesized Ti3Al composite coating on Ti-6Al-4V
Microstructure and tribological properties of laser in-situ synthesized Ti3Al composite coating on Ti-6Al-4V
Titanium intermetallics are highly significant to protect surfaces of lightweight structures against corrosion and wear. In this study, Ti and Al powders were uniformly mixed with an atomic ratio 65:35 and in-situ synthesized on Ti-6Al-4V substrate by laser cladding with Ar cooling. The microstructure and high temperature tribological behavior were studied. The results show that Ti3Al (α2) phase was first precipitated in the form of coarse primary dendrites during cladding solidification, and subsequently α-Ti (α) phase of needle-shaped martensite was formed by fast cooling. The 6:4 ratio of phase α2 to α of the composite coating provides optimal toughness and high hardness (680 HV). Under the testing up to 500 °C, the average friction coefficient of the composite coating is 0.22 ± 0.011 and a 35% lower wear rate than that of Ti-6Al-4V substrate.
Friction and Wear, Laser cladding, Microstructure, Ti3Al composite coating
0257-8972
Zhang, Wenbin
9936b8d7-caa5-4826-a0e1-b47d687245ec
Li, Wensheng
9483fd8e-f3d4-48b8-8a75-14ff5fc5d9e5
Zhai, Haimin
9831578f-7ef7-42ea-b540-f3543537e7fd
Wu, Yanrong
3b01c48f-2f31-4833-88c4-664aede42600
Wang, Shuncai
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
Liang, Gang
0e3c4750-8136-4804-a4dd-3530d6eee46c
Wood, Robert
d9523d31-41a8-459a-8831-70e29ffe8a73
Zhang, Wenbin
9936b8d7-caa5-4826-a0e1-b47d687245ec
Li, Wensheng
9483fd8e-f3d4-48b8-8a75-14ff5fc5d9e5
Zhai, Haimin
9831578f-7ef7-42ea-b540-f3543537e7fd
Wu, Yanrong
3b01c48f-2f31-4833-88c4-664aede42600
Wang, Shuncai
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
Liang, Gang
0e3c4750-8136-4804-a4dd-3530d6eee46c
Wood, Robert
d9523d31-41a8-459a-8831-70e29ffe8a73

Zhang, Wenbin, Li, Wensheng, Zhai, Haimin, Wu, Yanrong, Wang, Shuncai, Liang, Gang and Wood, Robert (2020) Microstructure and tribological properties of laser in-situ synthesized Ti3Al composite coating on Ti-6Al-4V. Surface and Coatings Technology, 395, [125944]. (doi:10.1016/j.surfcoat.2020.125944).

Record type: Article

Abstract

Titanium intermetallics are highly significant to protect surfaces of lightweight structures against corrosion and wear. In this study, Ti and Al powders were uniformly mixed with an atomic ratio 65:35 and in-situ synthesized on Ti-6Al-4V substrate by laser cladding with Ar cooling. The microstructure and high temperature tribological behavior were studied. The results show that Ti3Al (α2) phase was first precipitated in the form of coarse primary dendrites during cladding solidification, and subsequently α-Ti (α) phase of needle-shaped martensite was formed by fast cooling. The 6:4 ratio of phase α2 to α of the composite coating provides optimal toughness and high hardness (680 HV). Under the testing up to 500 °C, the average friction coefficient of the composite coating is 0.22 ± 0.011 and a 35% lower wear rate than that of Ti-6Al-4V substrate.

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Microstructure and tribological properties - Accepted Manuscript
Restricted to Repository staff only until 18 May 2022.
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More information

Accepted/In Press date: 18 May 2020
e-pub ahead of print date: 19 May 2020
Keywords: Friction and Wear, Laser cladding, Microstructure, Ti3Al composite coating

Identifiers

Local EPrints ID: 441128
URI: http://eprints.soton.ac.uk/id/eprint/441128
ISSN: 0257-8972
PURE UUID: 0c68a2e0-164a-4b01-b8a2-47743eb1db4e
ORCID for Robert Wood: ORCID iD orcid.org/0000-0003-0681-9239

Catalogue record

Date deposited: 02 Jun 2020 16:30
Last modified: 18 Feb 2021 16:43

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