Tuning hardness and fracture resistance of ZrN/Zr0.63Al0.37N nanoscale multilayers by stress-induced transformation toughening

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dc.contributor	Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica
dc.contributor	Universitat Politècnica de Catalunya. CIEFMA - Centre d'Integritat Estructural, Micromecànica i Fiabilitat dels Materials
dc.contributor.author	Yalamanchili, K
dc.contributor.author	Schramm, I. C.
dc.contributor.author	Jiménez Piqué, Emilio
dc.contributor.author	Rogstrom, L
dc.contributor.author	Muecklich, F.
dc.contributor.author	Oden, M
dc.contributor.author	Ghafoor, N
dc.date	2015-05-01
dc.identifier.citation	Yalamanchili, K., Schramm, I., Jimenez-Pique, E., Rogstrom, L., Muecklich, F., Oden, M., Ghafoor, N. Tuning hardness and fracture resistance of ZrN/Zr0.63Al0.37N nanoscale multilayers by stress-induced transformation toughening. "Acta materialia", 01 Maig 2015, p. 22-31.
dc.identifier.citation	1359-6454
dc.identifier.citation	10.1016/j.actamat.2015.01.066
dc.identifier.uri	http://hdl.handle.net/2117/76897
dc.language.iso	eng
dc.relation	http://www.sciencedirect.com/science/article/pii/S1359645415000798
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject	Àrees temàtiques de la UPC::Enginyeria dels materials
dc.subject	Fracture mechanics
dc.subject	Nitride multilayer thin films
dc.subject	Mechanical properties
dc.subject	Fracture toughness
dc.subject	transmission electron-microscopy
dc.subject	magnetron sputter-deposition
dc.subject	thin-films
dc.subject	mechanical-properties
dc.subject	cubic aln
dc.subject	phase
dc.subject	deformation
dc.subject	coatings
dc.subject	superlattices
dc.subject	tin
dc.subject	Mecànica de fractura
dc.title	Tuning hardness and fracture resistance of ZrN/Zr0.63Al0.37N nanoscale multilayers by stress-induced transformation toughening
dc.type	info:eu-repo/semantics/submittedVersion
dc.type	info:eu-repo/semantics/article
dc.description.abstract	Structure and mechanical properties of nanoscale multilayers of ZrN/Zr0.63Al0.37N grown by reactive magnetron sputtering on MgO (0 0 1) substrates at a temperature of 700 degrees C are investigated as a function of the Zr0.63Al0.37N layer thickness. The Zr0.63Al0.37N undergoes in situ chemical segregation into ZrN-rich and AlN-rich domains. The AlN-rich domains undergo transition from cubic to wurtzite crystal structure as a function of Zr0.63Al0.37N layer thickness. Such structural transformation allows systematic variation of hardness as well as fracture resistance of the films. A maximum fracture resistance is achieved for 2 nm thick Zr0.63Al0.37N layers where the AlN-rich domains are epitaxially stabilized in the metastable cubic phase. The metastable cubic-AlN phase undergoes stress-induced transformation to wurtzite-AlN when subjected to indentation, which results in the enhanced fracture resistance. A maximum hardness of 34 GPa is obtained for 10 nm thick Zr0.63Al0.37N layers where the wurtzite-AlN and cubic-ZrN rich domains form semi-coherent interfaces. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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