Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/74524
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Type: Journal article
Title: Designing superhard, self-toughening CrAlN coatings through grain boundary engineering
Author: Li, Z.
Munroe, P.
Jiang, Z.
Zhao, X.
Xu, J.
Zhou, Z.
Jiang, J.
Fang, F.
Xie, Z.
Citation: Acta Materialia, 2012; 60(16):5735-5744
Publisher: Pergamon-Elsevier Science Ltd
Issue Date: 2012
ISSN: 1359-6454
1873-2453
Statement of
Responsibility: 
Zhao Li, Paul Munroe, Zhong-tao Jiang, Xiaoli Zhao, Jiang Xu, Zhi-feng Zhou, Jian-qing Jiang, Feng Fang, Zong-han Xie
Abstract: One of the toughest challenges that hinders the application of ceramic coatings is their poor damage tolerance. Addressing this problem requires the development of novel micro- or nanostructures that would impart to these coatings both high hardness and high toughness. In this paper, CrAlN coatings, with varying Al contents up to 30 at.%, were engineered onto steel substrates using the magnetron sputtering technique. Whilst the addition of Al does not significantly alter the columnar microstructure, it does change the preferred grain orientation and increase the compressive residual stress. Moreover, the hardness, elastic strain to failure (H/E) and plastic deformation resistance (H 3/E 2) of the resultant CrAlN coating with the highest Al content were found to increase ∼47, ∼29 and ∼140%, respectively, as compared to CrN. Evidence collected from transmission electron microscopy and X-ray photoelectron spectroscopy experiments shows that AlN, existing in an amorphous state at the columnar CrN grain boundaries, has a crucial role in providing the unusual combination of high hardness and exceptional damage resistance. The results provide a new pathway to developing durable ceramic coatings suitable for applications involving severe loading conditions. © 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Keywords: Coating
Nanocrystalline microstructure
Nanoindentation
Residual stresses
Toughness
Rights: © 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
DOI: 10.1016/j.actamat.2012.06.049
Published version: http://dx.doi.org/10.1016/j.actamat.2012.06.049
Appears in Collections:Aurora harvest 4
Materials Research Group publications
Mechanical Engineering publications

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