Fracture toughness and structural evolution in the TiAlN system upon annealing

Abstract Hard coatings used to protect engineering components from external loads and harsh environments should ideally be strong and tough. Here we study the fracture toughness, K IC, of Ti1−xAlxN upon annealing by employing micro-fracture experiments on freestanding films. We found that K IC incre...

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Autores principales:	M. Bartosik, C. Rumeau, R. Hahn, Z. L. Zhang, P. H. Mayrhofer
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f24156ccd95c4a9db3c9d9ad4c3267d6
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spelling	oai:doaj.org-article:f24156ccd95c4a9db3c9d9ad4c3267d62021-12-02T15:06:11ZFracture toughness and structural evolution in the TiAlN system upon annealing10.1038/s41598-017-16751-12045-2322https://doaj.org/article/f24156ccd95c4a9db3c9d9ad4c3267d62017-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-16751-1https://doaj.org/toc/2045-2322Abstract Hard coatings used to protect engineering components from external loads and harsh environments should ideally be strong and tough. Here we study the fracture toughness, K IC, of Ti1−xAlxN upon annealing by employing micro-fracture experiments on freestanding films. We found that K IC increases by about 11% when annealing the samples at 900 °C, because the decomposition of the supersaturated matrix leads to the formation of nanometer-sized domains, precipitation of hexagonal-structured B4 AlN (with their significantly larger specific volume), formation of stacking faults, and nano-twins. In contrast, for TiN, where no decomposition processes and formation of nanometer-sized domains can be initiated by an annealing treatment, the fracture toughness K IC remains roughly constant when annealed above the film deposition temperature. As the increase in K IC found for Ti1−xAlxN upon annealing is within statistical errors, we carried out complementary cube corner nanoindentation experiments, which clearly show reduced (or even impeded) crack formation for annealed Ti1−xAlxN as compared with their as-deposited counterpart. The ability of Ti1−xAlxN to maintain and even increase the fracture toughness up to high temperatures in combination with the concomitant age hardening effects and excellent oxidation resistance contributes to the success of this type of coatings.M. BartosikC. RumeauR. HahnZ. L. ZhangP. H. MayrhoferNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q M. Bartosik C. Rumeau R. Hahn Z. L. Zhang P. H. Mayrhofer Fracture toughness and structural evolution in the TiAlN system upon annealing
description	Abstract Hard coatings used to protect engineering components from external loads and harsh environments should ideally be strong and tough. Here we study the fracture toughness, K IC, of Ti1−xAlxN upon annealing by employing micro-fracture experiments on freestanding films. We found that K IC increases by about 11% when annealing the samples at 900 °C, because the decomposition of the supersaturated matrix leads to the formation of nanometer-sized domains, precipitation of hexagonal-structured B4 AlN (with their significantly larger specific volume), formation of stacking faults, and nano-twins. In contrast, for TiN, where no decomposition processes and formation of nanometer-sized domains can be initiated by an annealing treatment, the fracture toughness K IC remains roughly constant when annealed above the film deposition temperature. As the increase in K IC found for Ti1−xAlxN upon annealing is within statistical errors, we carried out complementary cube corner nanoindentation experiments, which clearly show reduced (or even impeded) crack formation for annealed Ti1−xAlxN as compared with their as-deposited counterpart. The ability of Ti1−xAlxN to maintain and even increase the fracture toughness up to high temperatures in combination with the concomitant age hardening effects and excellent oxidation resistance contributes to the success of this type of coatings.
format	article
author	M. Bartosik C. Rumeau R. Hahn Z. L. Zhang P. H. Mayrhofer
author_facet	M. Bartosik C. Rumeau R. Hahn Z. L. Zhang P. H. Mayrhofer
author_sort	M. Bartosik
title	Fracture toughness and structural evolution in the TiAlN system upon annealing
title_short	Fracture toughness and structural evolution in the TiAlN system upon annealing
title_full	Fracture toughness and structural evolution in the TiAlN system upon annealing
title_fullStr	Fracture toughness and structural evolution in the TiAlN system upon annealing
title_full_unstemmed	Fracture toughness and structural evolution in the TiAlN system upon annealing
title_sort	fracture toughness and structural evolution in the tialn system upon annealing
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/f24156ccd95c4a9db3c9d9ad4c3267d6
work_keys_str_mv	AT mbartosik fracturetoughnessandstructuralevolutioninthetialnsystemuponannealing AT crumeau fracturetoughnessandstructuralevolutioninthetialnsystemuponannealing AT rhahn fracturetoughnessandstructuralevolutioninthetialnsystemuponannealing AT zlzhang fracturetoughnessandstructuralevolutioninthetialnsystemuponannealing AT phmayrhofer fracturetoughnessandstructuralevolutioninthetialnsystemuponannealing
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Fracture toughness and structural evolution in the TiAlN system upon annealing

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