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Type: Journal article
Title: Study of the structure, properties, scratch resistance and deformation behaviour of graded Cr-CrN-Cr(1-x)AlxN coatings
Author: Kabir, M.
Munroe, P.
Zhou, Z.
Xie, Z.
Citation: Ceramics International, 2018; 44(10):11364-11373
Publisher: Elsevier
Issue Date: 2018
ISSN: 0272-8842
Statement of
Mohammad Sharear Kabir, Paul Munroe, Zhifeng Zhou, Zonghan Xie
Abstract: An in-depth investigation of the structure, properties, scratch adhesion characteristics of graded Cr-CrN-Cr(1-x)AlxN coatings synthesized onto M42 steel substrates using closed – field unbalanced magnetron sputtering (CFUBMS) was carried out. Advanced microscopy (scanning and transmission electron microscopy), focused ion beam (FIB) imaging, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and micro–scratch tests was used to investigate the microstructure, mechanical properties and scratch performance as a function of Al content. FIB and TEM investigations revealed that the coatings exhibited a distinct structure; i.e., an adhesive Cr layer, a CrN transition layer and a graded CrAlN top layer with a face centered cubic (FCC) B1 structure. A columnar morphology was exhibited by the coatings and the dimensions of the columnar grains decreased with increasing Al content. Residual stress measurements, obtained from the XRD – sin2ψ method, revealed increasing compressive stresses with increasing Al content. Furthermore, nanoindentation tests showed an increase in mechanical properties, fracture toughness index (H/E) and plastic deformation resistance (H3/E2) as the Al content increased, accompanied by a decrease in the critical load, LC, during scratch testing implying a decrease in scratch toughness.
Keywords: Graded coating; unbalanced magnetron sputtering; plastic deformation resistance (H3/E2); nanoindentation; adhesion
Rights: © 2018 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
DOI: 10.1016/j.ceramint.2018.03.187
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Mechanical Engineering publications

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