Effect of the Post-Deposition Thermal Treatment on the Mechanical Properties of a Compositionally Modulated CrAlSiN-AlSiN Coating

A CrAlSiN-AlSiN coating with periodically modulated composition was investigated regarding dependence of the mechanical properties and toughness, morphology, composition, and structure on thermal treatment in the interval of 600–900 °C in argon ambience. The coating exhibited superhardness and high...

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Autores principales:	Lilyana Kolaklieva, Roumen Kakanakov, Daniela Kovacheva, Vasiliy Chitanov, Tetyana Cholakova, Christo Bahchedjiev, Stefan Kolchev
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	nanocomposites mechanical properties structural properties cathodic arc deposition Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/4a7f0e62b76a4b0ea061234405294aca
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spelling	oai:doaj.org-article:4a7f0e62b76a4b0ea061234405294aca2021-11-25T17:15:53ZEffect of the Post-Deposition Thermal Treatment on the Mechanical Properties of a Compositionally Modulated CrAlSiN-AlSiN Coating10.3390/coatings111113112079-6412https://doaj.org/article/4a7f0e62b76a4b0ea061234405294aca2021-10-01T00:00:00Zhttps://www.mdpi.com/2079-6412/11/11/1311https://doaj.org/toc/2079-6412A CrAlSiN-AlSiN coating with periodically modulated composition was investigated regarding dependence of the mechanical properties and toughness, morphology, composition, and structure on thermal treatment in the interval of 600–900 °C in argon ambience. The coating exhibited superhardness and high toughness up to 800 °C. A very slight decrease in the nanohardness, resistance to elastic strain to failure, and plastic deformation were observed. The coating had enhanced elastic recovery stable up to 700 °C. It was found that the coating morphology was not substantially influenced by the thermal treatment. X-ray diffraction (XRD) analysis revealed that the modulated coating had a nanocomposite structure, which did not change after annealing, even at 900 °C. The grains were composed mainly of fcc-CrN and h-AlN phases embedded into an amorphous Si<sub>3</sub>N<sub>4</sub> matrix. A small amount of an h-Cr<sub>2</sub>N phase appeared after heating at temperatures above 700 °C. The coating composition was examined by energy-dispersive X-ray spectroscopy (EDS). The coating was stoichiometric up to 800 °C. It became sub-stoichiometric with respect to nitrogen after annealing at 800 °C and 900 °C. It is thus concluded that the CrAlSiN-AlSiN coating with a periodically modulated structure keeps the combination of superhardness (45.3 GPa) and improved toughness (H<sup>3</sup>/E*<sup>2</sup> = 0.362 GPa, elastic recovery 57%) at temperatures up to 800 °C, and is suitable for high thermal applications.Lilyana KolaklievaRoumen KakanakovDaniela KovachevaVasiliy ChitanovTetyana CholakovaChristo BahchedjievStefan KolchevMDPI AGarticlenanocompositesmechanical propertiesstructural propertiescathodic arc depositionEngineering (General). Civil engineering (General)TA1-2040ENCoatings, Vol 11, Iss 1311, p 1311 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	nanocomposites mechanical properties structural properties cathodic arc deposition Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	nanocomposites mechanical properties structural properties cathodic arc deposition Engineering (General). Civil engineering (General) TA1-2040 Lilyana Kolaklieva Roumen Kakanakov Daniela Kovacheva Vasiliy Chitanov Tetyana Cholakova Christo Bahchedjiev Stefan Kolchev Effect of the Post-Deposition Thermal Treatment on the Mechanical Properties of a Compositionally Modulated CrAlSiN-AlSiN Coating
description	A CrAlSiN-AlSiN coating with periodically modulated composition was investigated regarding dependence of the mechanical properties and toughness, morphology, composition, and structure on thermal treatment in the interval of 600–900 °C in argon ambience. The coating exhibited superhardness and high toughness up to 800 °C. A very slight decrease in the nanohardness, resistance to elastic strain to failure, and plastic deformation were observed. The coating had enhanced elastic recovery stable up to 700 °C. It was found that the coating morphology was not substantially influenced by the thermal treatment. X-ray diffraction (XRD) analysis revealed that the modulated coating had a nanocomposite structure, which did not change after annealing, even at 900 °C. The grains were composed mainly of fcc-CrN and h-AlN phases embedded into an amorphous Si<sub>3</sub>N<sub>4</sub> matrix. A small amount of an h-Cr<sub>2</sub>N phase appeared after heating at temperatures above 700 °C. The coating composition was examined by energy-dispersive X-ray spectroscopy (EDS). The coating was stoichiometric up to 800 °C. It became sub-stoichiometric with respect to nitrogen after annealing at 800 °C and 900 °C. It is thus concluded that the CrAlSiN-AlSiN coating with a periodically modulated structure keeps the combination of superhardness (45.3 GPa) and improved toughness (H<sup>3</sup>/E*<sup>2</sup> = 0.362 GPa, elastic recovery 57%) at temperatures up to 800 °C, and is suitable for high thermal applications.
format	article
author	Lilyana Kolaklieva Roumen Kakanakov Daniela Kovacheva Vasiliy Chitanov Tetyana Cholakova Christo Bahchedjiev Stefan Kolchev
author_facet	Lilyana Kolaklieva Roumen Kakanakov Daniela Kovacheva Vasiliy Chitanov Tetyana Cholakova Christo Bahchedjiev Stefan Kolchev
author_sort	Lilyana Kolaklieva
title	Effect of the Post-Deposition Thermal Treatment on the Mechanical Properties of a Compositionally Modulated CrAlSiN-AlSiN Coating
title_short	Effect of the Post-Deposition Thermal Treatment on the Mechanical Properties of a Compositionally Modulated CrAlSiN-AlSiN Coating
title_full	Effect of the Post-Deposition Thermal Treatment on the Mechanical Properties of a Compositionally Modulated CrAlSiN-AlSiN Coating
title_fullStr	Effect of the Post-Deposition Thermal Treatment on the Mechanical Properties of a Compositionally Modulated CrAlSiN-AlSiN Coating
title_full_unstemmed	Effect of the Post-Deposition Thermal Treatment on the Mechanical Properties of a Compositionally Modulated CrAlSiN-AlSiN Coating
title_sort	effect of the post-deposition thermal treatment on the mechanical properties of a compositionally modulated cralsin-alsin coating
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/4a7f0e62b76a4b0ea061234405294aca
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_version_	1718412526874525696

Effect of the Post-Deposition Thermal Treatment on the Mechanical Properties of a Compositionally Modulated CrAlSiN-AlSiN Coating

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