Study of the structure, properties, scratch resistance and deformation behaviour of graded Cr-CrN-Cr(1-x)AlxN coatings

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

6 Scopus Citations
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Author(s)

  • Mohammad Sharear Kabir
  • Paul Munroe
  • Zhifeng Zhou
  • Zonghan Xie

Detail(s)

Original languageEnglish
Pages (from-to)11364-11373
Journal / PublicationCeramics International
Volume44
Issue number10
Online published22 Mar 2018
Publication statusPublished - Jul 2018

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.

Research Area(s)

  • Adhesion, Graded coatings, Nanoindentation, Plastic deformation resistance (H3/E2), Unbalanced magnetron sputtering

Citation Format(s)

Study of the structure, properties, scratch resistance and deformation behaviour of graded Cr-CrN-Cr(1-x)AlxN coatings. / Kabir, Mohammad Sharear; Munroe, Paul; Zhou, Zhifeng; Xie, Zonghan.

In: Ceramics International, Vol. 44, No. 10, 07.2018, p. 11364-11373.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal