Surface morphology of a laser surface nitrided and etched Ti–6Al–4V alloy

A laser surface nitriding process was applied to a Ti–6Al–4V alloy to obtain a surface layer consisting of TiN dendrites and a titanium alloy matrix. The dendritic volume fraction can be controlled by varying the nitrogen flow rate during the laser gas nitriding. By subsequently applying a selective...

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Bibliographic Details
Published in:Surface & coatings technology 2005-03, Vol.192 (2), p.341-346
Main Authors: Man, H.C., Zhao, N.Q., Cui, Z.D.
Format: Article
Language:English
Subjects:
Adhesion
Applied sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Heat treatment
Laser nitriding
Materials science
Metals. Metallurgy
Other topics in materials science
Physics
Production techniques
Selective etching
Thermochemical treatment and diffusion treatment
Titanium alloy
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Summary:A laser surface nitriding process was applied to a Ti–6Al–4V alloy to obtain a surface layer consisting of TiN dendrites and a titanium alloy matrix. The dendritic volume fraction can be controlled by varying the nitrogen flow rate during the laser gas nitriding. By subsequently applying a selective etching process, the matrix material in the alloyed layer can be selectively removed and a three-dimensional network of TiN dendrites is left on the surface anchoring on the substrate. The 3D dendritic network provides extra surface area and a locking mechanism for the adhesion joint with a ceramic layer. The interface cross-section microstructure of such adhesion jointing surfaces is discussed.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2004.07.076