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Title: The effect of Si content on the fracture toughness of CrAlN/Si{sub 3}N{sub 4} coatings

CrAlN/Si{sub 3}N{sub 4} nanocomposite coatings with different Si contents were deposited to understand how Si influences the microstructure and mechanical behaviour of the coatings, in particular, the fracture toughness. The coating composition, chemical bonding, microstructure, and mechanical properties were studied by energy dispersive spectroscopy, x-ray photoelectron spectroscopy, x-ray diffraction, and nanoindentation, respectively. Using a micro double cantilever beam sample, it was found that the fracture toughness of CrAlN/Si{sub 3}N{sub 4} coatings was higher than that of both the CrN and CrAlN coatings and increased with increasing Si content. Cross-sectional transmission electron microscopy suggested that this was caused by the suppression of cracking at columnar boundaries.
Authors:
 [1] ;  [2] ;  [3] ; ;  [4] ;  [1]
  1. Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore 638075 (Singapore)
  2. (United Kingdom)
  3. Laboratory for Nanometallurgy, ETH Z├╝rich, Vladimir-Prelog-Weg 5, 8093 Zurich (Switzerland)
  4. Gordon Laboratory, Department of Materials Science and Metallurgy, 27 Charles Babbage Rd., Cambridge CB3 0FS (United Kingdom)
Publication Date:
OSTI Identifier:
22494909
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 119; Journal Issue: 2; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHEMICAL BONDS; CHROMIUM NITRIDES; COATINGS; FRACTURE PROPERTIES; MICROSTRUCTURE; SILICON NITRIDES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY