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https://hdl.handle.net/2440/75905
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Type: | Journal article |
Title: | Factors governing the mechanical behaviour of CrSiN coatings: Combinednanoindentation testing and transmission electron microscopy |
Author: | Wo, P. Munroe, P. Li, Z. Jiang, Z. Xie, Z. Zhou, Z. Li, K. |
Citation: | Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing, 2012; 534:297-308 |
Publisher: | Elsevier Science SA |
Issue Date: | 2012 |
ISSN: | 0921-5093 |
Statement of Responsibility: | P.C. Wo, P.R. Munroe, Z. Li, Z.-T. Jiang, Z.H. Xie, Z.F. Zhou, K.Y. Li |
Abstract: | A direct link between the microstructure and mechanical properties of CrSiN coatings with varying Si contents was established by examining their microstructural evolution and deformation behaviour, enabled by cross-sectional transmission electron microscopy. A transformation from a columnar-grained structure, in the binary compound, to a nanocomposite structure, consisting of CrN nanocrystallites embedded in an amorphous matrix, was observed in the coating having a Si content of 28.5at.%. The columnar-structured coatings were observed to deform by grain boundary shear sliding, whilst cracks occurred in nanocomposite coatings. Moreover, the coating having a Si content of 14.3at.% exhibited the highest hardness as a result of grain boundary strengthening facilitated by Si3N4 segregation, together with solid solution strengthening of Si in CrN, the Hall-Petch effect for the finer CrN grains and a high compressive residual stress. A further increase of Si content to 28.5at.% led to a reduction in hardness due to the high volume fraction of the amorphous phase, together with the presence of cracks in the as-deposited coating. The findings provide deeper insight into the origin of the mechanical behaviour of CrSiN coatings. © 2011 Elsevier B.V.. |
Keywords: | Transmission electron microscopy (TEM) Nanoindentation X-ray photoelectron spectroscopy (XPS) Deformation structure Coatings Chromium silicon nitride |
Rights: | © 2011 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.msea.2011.11.072 |
Published version: | http://dx.doi.org/10.1016/j.msea.2011.11.072 |
Appears in Collections: | Aurora harvest 4 Materials Research Group publications Mechanical Engineering conference papers |
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