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https://hdl.handle.net/2440/132863
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Type: | Journal article |
Title: | Influence of substrate bias on the scratch, wear and indentation response of TiSiN nanocomposite coatings |
Author: | Akhter, R. Zhou, Z. Xie, Z. Munroe, P. |
Citation: | Surface and Coatings Technology, 2021; 425:127687-1-127687-15 |
Publisher: | Elsevier BV |
Issue Date: | 2021 |
ISSN: | 0257-8972 1879-3347 |
Statement of Responsibility: | Rumana Akhter, Zhifeng Zhou, Zonghan Xie, Paul Munroe |
Abstract: | TiSiN coatings were synthesised onto AISI M42 tool steel substrates via closed field unbalanced magnetron sputtering ion plating, using bias voltages of −40 and −50 V. The aim of this study is to investigate the underlying deformation mechanisms of TiSiN coatings, prepared at two different substrate bias voltages, following scratching, wear and indentation tests. A graded columnar microstructure evolved in these coatings. A hardness value of ~30.2 GPa was determined in the coating prepared at the lower bias voltage (i.e., −40 V), which was correlated to the fine nanocomposite structure and the presence of a high compressive residual stress. Of note, for the coating deposited at −40 V enhanced scratch adhesion strength, i.e., higher critical loads (L(c1) and L(c2)) against cohesive and adhesive failure were determined with the higher H/Eᵣ and H³/Eᵣ² values. The improved scratch resistance was ascribed to the hierarchical structure that hindered crack propagation in the TiSiN coatings during progressive loading. An approximately 21% decrease in wear rate was obtained at the lower bias voltage, which was attributed to the slightly lower Si concentration (~8.3 at.%) and, in turn, higher hardness. Deformation behaviour under indentation loading was dominated by shear sliding along the columnar grain boundaries. |
Keywords: | TiSiN coating; microstructure; mechanical response; scratch behaviour; tribological performance; indentation response |
Rights: | © 2021 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.surfcoat.2021.127687 |
Grant ID: | http://purl.org/au-research/grants/arc/DP200103152 |
Published version: | http://dx.doi.org/10.1016/j.surfcoat.2021.127687 |
Appears in Collections: | Mechanical Engineering publications |
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