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Processing of CP-Ti by high-pressure torsion and the effect of surface modification using a post-HPT laser treatment

Processing of CP-Ti by high-pressure torsion and the effect of surface modification using a post-HPT laser treatment
Processing of CP-Ti by high-pressure torsion and the effect of surface modification using a post-HPT laser treatment
Commercial purity titanium (CP-Ti) was processed by high-pressure torsion (HPT) with various numbers of turns (N = 1, 10 and 20). The hardness of the CP-Ti increased with an increasing number of HPT turns due to grain refinement. Tensile testing showed that the PT-processed 10 turns sample had low ductility and high strength but the ductility may be improved through post-HPT short-term annealing at carefully selected temperatures. Some HPT-processed samples were laser surface-treated with different laser powers and scanning speeds.
The surface roughness of the laser-textured samples increased with increasing laser power and led to a lower contact angle which signifies an increased hydrophilicity. After a holding time of 13 days, the samples underwent a hydrophilic-to-hydrophobic transformation as the contact angle increased
to as much as 129 degree. It is concluded that laser surface texture processes are capable of controlling the hydrophilic / hydrophobic properties of ultra-fine grained CP-Ti.
0925-8388
653-659
Lin, Hsuan-Kai
51b9d2d1-713d-46c4-a761-953b1aaebb34
Li, Guan Yuan
57828c09-2dfa-4c62-9ed7-499354c97840
Mortier, Sarah
d67d2137-ffdf-4dfb-bafa-0b9b8e956fa0
Bazarnik, Piotr
7612d50d-0cfc-43b1-a48f-f5062caacc1e
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Lewandowska, Malgorzata
c574d02d-d34d-4164-8ed1-90c3d77584d2
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Lin, Hsuan-Kai
51b9d2d1-713d-46c4-a761-953b1aaebb34
Li, Guan Yuan
57828c09-2dfa-4c62-9ed7-499354c97840
Mortier, Sarah
d67d2137-ffdf-4dfb-bafa-0b9b8e956fa0
Bazarnik, Piotr
7612d50d-0cfc-43b1-a48f-f5062caacc1e
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Lewandowska, Malgorzata
c574d02d-d34d-4164-8ed1-90c3d77584d2
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Lin, Hsuan-Kai, Li, Guan Yuan, Mortier, Sarah, Bazarnik, Piotr, Huang, Yi, Lewandowska, Malgorzata and Langdon, Terence G (2019) Processing of CP-Ti by high-pressure torsion and the effect of surface modification using a post-HPT laser treatment. Journal of Alloys and Compounds, 784, 653-659. (doi:10.1016/j.jallcom.2019.01.019).

Record type: Article

Abstract

Commercial purity titanium (CP-Ti) was processed by high-pressure torsion (HPT) with various numbers of turns (N = 1, 10 and 20). The hardness of the CP-Ti increased with an increasing number of HPT turns due to grain refinement. Tensile testing showed that the PT-processed 10 turns sample had low ductility and high strength but the ductility may be improved through post-HPT short-term annealing at carefully selected temperatures. Some HPT-processed samples were laser surface-treated with different laser powers and scanning speeds.
The surface roughness of the laser-textured samples increased with increasing laser power and led to a lower contact angle which signifies an increased hydrophilicity. After a holding time of 13 days, the samples underwent a hydrophilic-to-hydrophobic transformation as the contact angle increased
to as much as 129 degree. It is concluded that laser surface texture processes are capable of controlling the hydrophilic / hydrophobic properties of ultra-fine grained CP-Ti.

Text
LinHK-JACOM 2019-accepted manuscript - Accepted Manuscript
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More information

Accepted/In Press date: 2 January 2019
e-pub ahead of print date: 4 January 2019
Published date: 5 May 2019

Identifiers

Local EPrints ID: 427235
URI: http://eprints.soton.ac.uk/id/eprint/427235
ISSN: 0925-8388
PURE UUID: 17316b98-bffe-45ea-93dc-1599ecb59301
ORCID for Yi Huang: ORCID iD orcid.org/0000-0001-9259-8123
ORCID for Terence G Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 09 Jan 2019 17:30
Last modified: 26 Nov 2021 07:10

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Contributors

Author: Hsuan-Kai Lin
Author: Guan Yuan Li
Author: Sarah Mortier
Author: Piotr Bazarnik
Author: Yi Huang ORCID iD
Author: Malgorzata Lewandowska

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