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
Abstract
Commercial 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.Author | |||||
Journal series | Journal of Alloys and Compounds, ISSN 0925-8388, (N/A 100 pkt) | ||||
Issue year | 2019 | ||||
Vol | 784 | ||||
Pages | 653-659 | ||||
Publication size in sheets | 0.5 | ||||
Keywords in English | CP-Ti, High-pressure torsion, Hydrophilic, Hydrophobic, Laser surface texturing, Ultrafine-grains | ||||
ASJC Classification | ; ; ; | ||||
DOI | DOI:10.1016/j.jallcom.2019.01.019 | ||||
Language | en angielski | ||||
File |
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Score (nominal) | 100 | ||||
Score source | journalList | ||||
Score | = 100.0, 20-10-2019, ArticleFromJournal | ||||
Publication indicators | : 2016 = 1.321; : 2017 = 3.779 (2) - 2017=3.315 (5) | ||||
Citation count* |
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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