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Lubricants 2018, 6(2), 36; https://doi.org/10.3390/lubricants6020036

Laser Surface Texturing of TiAl Multilayer Films—Effects of Microstructure and Topography on Friction and Wear

1
Institute for Engineering Design and Logistics Engineering, Vienna University of Technology, 1060 Vienna, Austria
2
Department of Material Science and Engineering, Saarland University, Saarbrücken 66123, Germany
3
Department of Chemical Engineering, Biotechnology and Materials, FCFM, Universidad de Chile, Santiago 1058, Chile
*
Author to whom correspondence should be addressed.
Received: 16 March 2018 / Accepted: 15 April 2018 / Published: 16 April 2018
(This article belongs to the Special Issue Improvement of Friction and Wear by Laser Surface Texturing)
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Abstract

Laser surface texturing is an efficient way to control the friction and wear properties of materials. Although described in many papers, most previous work relates to a pure topographic view of laser-textured surfaces. As lasers are heat sources, their thermal impact during treatment can be high enough to modify the material’s microstructure or surface chemistry and affect tribological properties as well. This research took a closer look at the microstructure of laser-textured TiAl multilayers, besides topographic aspects. Direct laser interference patterning was used to create well-defined line-like surface textures in TiAl multilayers with differing lateral feature sizes in the micron range. High-resolution techniques such as TEM and XRD highlighted the effect of this method on microstructure, and in particular, the phase situation of the TiAl multilayer. Thermal simulations demonstrated that the maximum achievable temperatures were around 2000 K, thus being high enough to melt Ti and Al. Cooling rates on the order of 109 K/s depended on the lateral feature size, potentially leading to metastable microstructures. Finally, ball-on-disk tests on as-textured TiAl specimens showed a reduction in wear under dry conditions depending on the periodicity of the line-like textures used. View Full-Text
Keywords: laser surface texturing; dry friction; wear; multilayer thin films; microstructure laser surface texturing; dry friction; wear; multilayer thin films; microstructure
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Gachot, C.; Grützmacher, P.; Rosenkranz, A. Laser Surface Texturing of TiAl Multilayer Films—Effects of Microstructure and Topography on Friction and Wear. Lubricants 2018, 6, 36.

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