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

Lin, H-K., Li, G.Y., Mortier, S., Bazarnik, P., Huang, Y., Lewandowska, M. and Langdon, T.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 (May), pp. 653-659.

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DOI: 10.1016/j.jallcom.2019.01.019

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 HPT-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.

Item Type:Article
ISSN:0925-8388
Group:Faculty of Science & Technology
ID Code:31609
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:08 Jan 2019 09:24
Last Modified:21 Jan 2019 10:12

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