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Park, Hyung Wook
Multiscale Hybrid Manufacturing Lab
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  • Multiscale hybrid manufacturing process

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Fabrication and synthesis of uniform TiO2 nanoporous and nanotubular structures on dual-phase Ti–6Al–4V alloy using electron-beam irradiation

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Title
Fabrication and synthesis of uniform TiO2 nanoporous and nanotubular structures on dual-phase Ti–6Al–4V alloy using electron-beam irradiation
Author
Sankara Narayanan, T.S.N.Kim, JisooPark, Hyung Wook
Issue Date
2020-02
Publisher
Elsevier BV
Citation
MATERIALS CHEMISTRY AND PHYSICS, v.242, pp.122549
Abstract
Developing homogeneous TiO2 nanoporous arrays (NPAs) and nanotubular arrays (NTAs) on biphasic Ti alloys is challenging. The present study used large-pulse electron-beam (LPEB) irradiation prior to anodizing, and ascertained its effectiveness for developing homogeneous TiO2 NPAs and NTAs on a dual (α + β)-phase Ti–6Al–4V alloy for the first time. The morphological features, structural characteristics, and corrosion resistance of the TiO2 NTAs formed on the LPEB-irradiated Ti–6Al–4V alloy were compared to those obtained on the untreated alloy. The irradiation transformed the dual (α + β)-phase structure into a single α′-martensite phase with a uniform distribution of alloying elements, and enabled the formation of a smooth surface finish with reduced surface roughness. The modified surface facilitated the formation of homogenous NPAs and NTAs. Annealing in air at 500 °C for 2 h transformed the amorphous as-prepared TiO2 NTAs into a mixture of anatase and rutile phases. Despite the appearance of cracks and an increase in intertubular spacing, the NTAs did not collapse. The NTAs formed on the untreated and LPEB-irradiated Ti–6Al–4V alloy provided better corrosion protection than their nonanodized counterparts.
URI
https://scholarworks.unist.ac.kr/handle/201301/31238
URL
https://www.sciencedirect.com/science/article/pii/S0254058419313598?via%3Dihub
DOI
10.1016/j.matchemphys.2019.122549
ISSN
0254-0584
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