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Homogeneous anodic TiO2 nanotube layers on Ti6Al4V alloy with improved adhesion strength and corrosion resistance

Homogeneous anodic TiO2 nanotube layers on Ti6Al4V alloy with improved adhesion strength and corrosion resistance
Homogeneous anodic TiO2 nanotube layers on Ti6Al4V alloy with improved adhesion strength and corrosion resistance

Hexagonal TiO2 nanotubes (TNTs) arrays are generally fabricated on Ti-based substrates for some biomedical purposes, but the TNT layers constructed on conventionally processed Ti alloys are usually inhomogeneous because the substrates typically contain both the α and β phases. In this work, high-pressure torsion (HPT) is applied to obtain a saturated single α-phase microstructure in Ti6Al4V alloys via strain-induced β phase dissolution. Homogeneous anodic TNT layers with three different morphologies, one-step nanoporous, one-step nanotubular, and two-step nanoporous structures, are electrochemically fabricated on the ultrafine-grained (UFG) Ti6Al4V alloy substrates after HPT processing, whereas the TNT layers prepared on coarse-grained substrates are normally inhomogeneous. More notably, the TNT layers show significantly improved adhesion strength to the UFG substrate as well as better corrosion resistance compared to those on the conventionally processed Ti6Al4V substrates. X-ray diffraction analysis, scanning electron microscopy in combination with electron backscatter diffraction, and transmission electron microscopy indicate that the improvement is due to a larger dislocation density in the UFG substrate as well as strain-induced β phase dissolution.

adhesion strength, high-pressure torsion, homogeneity, strain-induced phase transformation, TiO nanotubes
Hu, Nan
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Hu, Tao
030a82db-eb1f-4dea-b238-a801203329b3
Gao, Ang
b516be20-5a3f-4b26-b0e2-457d6dfc32c8
Gao, Nong
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Starink, Marco J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Chen, Ying
f3e95413-d97c-4037-ab90-ab2a7c15ea70
Sun, Wanting
67cb2890-35df-4982-adec-16c01d9b6e76
Liao, Qing
82feefca-1e3b-4dd4-b125-51f029169298
Tong, Liping
d474aacf-3674-4376-8c9e-ee9691594c6a
Xu, Xiaochang
612df0d9-b855-4394-929a-c90e414d414b
Chu, Paul K.
6ce1d607-81a0-44df-bcaa-065fe2110c21
Wang, Huaiyu
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Hu, Nan
40874e4b-293a-40ec-8c66-736096667b15
Hu, Tao
030a82db-eb1f-4dea-b238-a801203329b3
Gao, Ang
b516be20-5a3f-4b26-b0e2-457d6dfc32c8
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Starink, Marco J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Chen, Ying
f3e95413-d97c-4037-ab90-ab2a7c15ea70
Sun, Wanting
67cb2890-35df-4982-adec-16c01d9b6e76
Liao, Qing
82feefca-1e3b-4dd4-b125-51f029169298
Tong, Liping
d474aacf-3674-4376-8c9e-ee9691594c6a
Xu, Xiaochang
612df0d9-b855-4394-929a-c90e414d414b
Chu, Paul K.
6ce1d607-81a0-44df-bcaa-065fe2110c21
Wang, Huaiyu
0fb6ab86-5f5c-481c-923e-9f75f0f11e75

Hu, Nan, Hu, Tao, Gao, Ang, Gao, Nong, Starink, Marco J., Chen, Ying, Sun, Wanting, Liao, Qing, Tong, Liping, Xu, Xiaochang, Chu, Paul K. and Wang, Huaiyu (2019) Homogeneous anodic TiO2 nanotube layers on Ti6Al4V alloy with improved adhesion strength and corrosion resistance. Advanced Materials Interfaces, 6 (12), [1801964]. (doi:10.1002/admi.201801964).

Record type: Article

Abstract

Hexagonal TiO2 nanotubes (TNTs) arrays are generally fabricated on Ti-based substrates for some biomedical purposes, but the TNT layers constructed on conventionally processed Ti alloys are usually inhomogeneous because the substrates typically contain both the α and β phases. In this work, high-pressure torsion (HPT) is applied to obtain a saturated single α-phase microstructure in Ti6Al4V alloys via strain-induced β phase dissolution. Homogeneous anodic TNT layers with three different morphologies, one-step nanoporous, one-step nanotubular, and two-step nanoporous structures, are electrochemically fabricated on the ultrafine-grained (UFG) Ti6Al4V alloy substrates after HPT processing, whereas the TNT layers prepared on coarse-grained substrates are normally inhomogeneous. More notably, the TNT layers show significantly improved adhesion strength to the UFG substrate as well as better corrosion resistance compared to those on the conventionally processed Ti6Al4V substrates. X-ray diffraction analysis, scanning electron microscopy in combination with electron backscatter diffraction, and transmission electron microscopy indicate that the improvement is due to a larger dislocation density in the UFG substrate as well as strain-induced β phase dissolution.

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More information

e-pub ahead of print date: 14 April 2019
Published date: 21 June 2019
Keywords: adhesion strength, high-pressure torsion, homogeneity, strain-induced phase transformation, TiO nanotubes

Identifiers

Local EPrints ID: 432807
URI: http://eprints.soton.ac.uk/id/eprint/432807
PURE UUID: f40dfb2e-0dec-446f-a61d-adf4186a447b
ORCID for Nong Gao: ORCID iD orcid.org/0000-0002-7430-0319

Catalogue record

Date deposited: 26 Jul 2019 16:30
Last modified: 16 Mar 2024 03:21

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Contributors

Author: Nan Hu
Author: Tao Hu
Author: Ang Gao
Author: Nong Gao ORCID iD
Author: Ying Chen
Author: Wanting Sun
Author: Qing Liao
Author: Liping Tong
Author: Xiaochang Xu
Author: Paul K. Chu
Author: Huaiyu Wang

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