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Fracture behaviour of nc-TiAlN/a-Si3N4 nanocomposite coating during nanoimpact test
International Advanced Research Centre for Powder Metallurgy and New Materials, Balapur P.O., Hyderabad 500 005, India.
Jawaharlal Nehru Technological University College of Engineering, Kukatpally, Hyderabad 500 085, India.
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0001-5521-6894
2016 (English)In: Surface Engineering, ISSN 0267-0844, E-ISSN 1743-2944, 1-10 p.Article in journal (Refereed) Epub ahead of print
Abstract [en]

Cyclic nanoimpact tests were carried on nc-TiAlN/a-Si3N4 nanocomposite, TiN and multilayered TiN/nanocomposite (NC) coatings to evaluate their resistance to fracture under cyclic impact loads. Fracture behaviour of the coatings was ascertained from fracture probability obtained from time-depth curves and focus ion beam milling images of resulting indentation impressions. TiN coating mainly showed intercolumnar cracks while the other coatings showed other modes of cracking, that is, lateral, inclined, bending, edge cracks, during testing. The performance ranking of the coatings, TiN > TiN/NC > nc-TiAlN/a-Si3N4, is linked to their β0 value, representing relative indentation depth of the coating-substrate composite hardness system at which the fractional hardness improvement equal to 50% of the maximum is retained and also their corresponding microstructure. Apart from enabling prediction of fracture resistance of the coatings, these studies provide useful insights into design and selection of coating materials for targeted machining applications. © 2016 Institute of Materials, Minerals and Mining

Place, publisher, year, edition, pages
2016. 1-10 p.
Keyword [en]
Composite coatings; Cracks; Fracture; Fracture mechanics; Hardness; Ion beams; Nanocomposites; Tin; Titanium compounds; Titanium nitride, Composite hardness; Fracture probability; Nano-composite coating; Nanoimpact; Performance rankings; Relative indentation depths; TiAlN; TiAlSiN, Coatings
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology; ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-10361DOI: 10.1080/02670844.2016.1239853ScopusID: 2-s2.0-84990249411OAI: oai:DiVA.org:hv-10361DiVA: diva2:1058240
Available from: 2016-12-20 Created: 2016-12-20 Last updated: 2016-12-22Bibliographically approved

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Joshi, Shrikant V.
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