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 Hsuan-Kai Lin
Hsuan-Kai Lin,,
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, Guan Yuan Li
Guan Yuan Li,,
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, Sarah Mortier
Sarah Mortier,,
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, Piotr Bazarnik (FMSE / DMD)
Piotr Bazarnik,,
- Division of Materials Design
, Y Huang
Y Huang,,
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, Małgorzata Lewandowska (FMSE / DMD)
Małgorzata Lewandowska,,
- Division of Materials Design
, Terence G. Langdon
Terence G. Langdon,,
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Journal seriesJournal of Alloys and Compounds, ISSN 0925-8388, (N/A 100 pkt)
Issue year2019
Vol784
Pages653-659
Publication size in sheets0.5
Keywords in EnglishCP-Ti, High-pressure torsion, Hydrophilic, Hydrophobic, Laser surface texturing, Ultrafine-grains
ASJC Classification2505 Materials Chemistry; 2506 Metals and Alloys; 2210 Mechanical Engineering; 2211 Mechanics of Materials
DOIDOI:10.1016/j.jallcom.2019.01.019
Languageen angielski
File
2019 JALCOM.pdf 1.7 MB
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 20-10-2019, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2016 = 1.321; WoS Impact Factor: 2017 = 3.779 (2) - 2017=3.315 (5)
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