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Type: Journal article
Title: Connecting structural, mechanical and tribological characteristics of Al alloyed nanocrystalline molybdenum silicide coatings
Author: Xu, J.
Mao, X.
Xie, Z.
Munroe, P.
Citation: Journal of Physics D: Applied Physics, 2013; 46(6):1-16
Publisher: IOP Publishing Ltd
Issue Date: 2013
ISSN: 0022-3727
Statement of
Jiang Xu, XiangZhen Mao, Zong-Han Xie and Paul Munroe
Abstract: In this study, novel nanocrystalline molybdenum silicide coatings with differing Al contents were deposited on a commercial titanium substrate using a double-cathode glow discharge apparatus. Their microstructures were characterized by x-ray diffraction, scanning electron microscopy (SEM) and transmission electron microscopy. These coatings mainly consisted of MoSi₂ and Mo₅Si₃ phases; the ratio of Mo₅Si₃ to MoSi₂ gradually increased from the surface towards the interior of coatings, forming a graded structure. With the increase in Al content, the hardness and elastic modulus of the coatings slightly decreased, but the ratios of H/E and 1/E²H, as well as damage tolerance, increased. Furthermore, these newly developed coatings showed excellent wear resistance; their specific wear rates were not only considerably lower than that of the monolithic MoSi₂ coating, but also decreased with increasing Al content. The plan and cross-sectional views of the worn surfaces and wear debris were analysed using SEM and energy dispersive x-ray spectroscopy. The relationships between coating structure, mechanical property and wear mechanism were then clarified, which will help in designing hard, tough and wear-resistant coatings for applications involving severe loading conditions.
Keywords: Surfaces, interfaces and thin films
Condensed matter: structural, mechanical & thermal
Nanoscale science and low-D systems
Rights: © 2013 IOP Publishing Ltd.
DOI: 10.1088/0022-3727/46/6/065304
Appears in Collections:Aurora harvest
Mechanical Engineering conference papers

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