Effects of mechanical properties and layer structure on the cyclic dynamic loading of TiN-based coatings |
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| Authors: | Jian Chen Ran Ji Raja HU Khan Xiaoying Li Ben D Beake Hanshan Dong |
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| Affiliation: | 1. School of Engineering, Robert Gordon University, Garthdee Road, Aberdeen AB10 7GJ, UK;2. School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK;3. School of Mechanical and Aerospace Engineering, Queen''s University, Belfast BT9 5AH, UK;4. Thin Film Centre, Scottish Universities Physics Alliances (SUPA), University of West of Scotland, Paisley PA1 2BE, UK;1. Department of Engineering, Faculty of Science and Engineering, Manchester Metropolitan University, Manchester M1 5GD, UK;2. Department of Design, Manufacturing and Engineering Management, University of Strathclyde, Glasgow G1 1XJ, UK;3. Micro Materials Ltd., Willow House, Yale Business Village, Ellice Way, Wrexham LL13 7YL, UK;4. Engineering Services Analysis Limited, Altringham, Cheshire WA14 5GL, UK |
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| Abstract: | The cyclic dynamic loading behaviour of a multilayer TiAlSiN coating on M2 steel was systematically investigated using repetitive nano-impact over a wide range of impact load. Its behaviour was compared with a monolayer TiN on the same substrate. When the load was increased to 10 mN and 30 mN for the TiN and TiAlSiN coatings, respectively, cracks started to appear during the tests demonstrated as depth steps in the impact depth curves. The improved crack resistance of TiAlSiN coating is consistent with its higher H/Er and H3/Er2 measured by nanoindentation. The impact footprints were studied from both top-view and cross-sectional view using a focused ion beam microscope and SEM. Spallation was observed in both coatings at higher impact loads. TiAlSiN coating shows much less spallation due to its multilayer structure. The cross-sectional study discovered that the cracks were initiated within the coating. A simple model has been used to study the power law relationship between the impact volume loss and the impact velocity. |
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