Processing of CP-Ti by high-pressure torsion and the effect of surface modification using a post-HPT laser treatment
Hsuan-Kai Lin , Guan Yuan Li , Sarah Mortier , Piotr Bazarnik , Y Huang , Małgorzata Lewandowska , Terence G. Langdon
AbstractCommercial purity titanium (CP-Ti) was processed by high-pressure torsion (HPT) with various numbers of turns (N ¼ 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�. It is concluded that laser surface texture processes are capable of controlling the hydrophilic/hydrophobic properties of ultra-fine grained CP-Ti.
|Journal series||Journal of Alloys and Compounds, ISSN 0925-8388, (A 35 pkt)|
|Publication size in sheets||0.5|
|Keywords in English||CP-Ti, High-pressure torsion, Hydrophilic, Hydrophobic, Laser surface texturing, Ultrafine-grains|
|ASJC Classification||; ; ;|
|Score||= 35.0, 08-05-2019, ArticleFromJournal|
|Publication indicators||: 2016 = 1.321; : 2017 = 3.779 (2) - 2017=3.315 (5)|
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