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Influence of Tantalum on phase stability and mechanical properties of WB2

Published online by Cambridge University Press:  04 February 2019

Christoph Fuger ,
Vincent Moraes ,
Rainer Hahn Open the ORCID record for Rainer Hahn [Opens in a new window] ,
Hamid Bolvardi ,
Peter Polcik ,
Helmut Riedl Open the ORCID record for Helmut Riedl [Opens in a new window]  and
Paul Heinz Mayrhofer
Christoph Fuger*
Affiliation:
Christian Doppler Laboratory for Application Oriented Coating Development, Institute of Materials Science and Technology, TU Wien, A-1060 Wien, Austria
Vincent Moraes
Affiliation:
Christian Doppler Laboratory for Application Oriented Coating Development, Institute of Materials Science and Technology, TU Wien, A-1060 Wien, Austria
Rainer Hahn
Affiliation:
Christian Doppler Laboratory for Application Oriented Coating Development, Institute of Materials Science and Technology, TU Wien, A-1060 Wien, Austria
Hamid Bolvardi
Affiliation:
Oerlikon Balzers, Oerlikon Surface Solutions AG, FL-9496 Balzers, Liechtenstein
Peter Polcik
Affiliation:
Plansee Composite Materials GmbH, D-86983 Lechbruck am See, Germany
Helmut Riedl
Affiliation:
Christian Doppler Laboratory for Application Oriented Coating Development, Institute of Materials Science and Technology, TU Wien, A-1060 Wien, Austria Institute of Materials Science and Technology, TU Wien, A-1060 Wien, Austria
Paul Heinz Mayrhofer
Affiliation:
Christian Doppler Laboratory for Application Oriented Coating Development, Institute of Materials Science and Technology, TU Wien, A-1060 Wien, Austria Institute of Materials Science and Technology, TU Wien, A-1060 Wien, Austria
*
Address all correspondence to Christoph Fuger at [email protected]
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Abstract

Based on density functional theory, we recently suggested that metastable α-WB2 is a promising candidate combining very high hardness with high toughness. These calculations further suggested that the addition of Tantalum supports the crystallization of α-structured W1−xTaxB2−z, with only minor reduction in toughness. Thus, various Ta containing WB2-based coatings have been synthesized using physical vapor deposition. With increasing Ta content, the hardness increases from ~41 GPa (WB2) to ~45 GPa (W0.74Ta0.26B2). In situ micromechanical cantilever bending tests exhibit fracture toughness KIC values of 3.7 to 3.0 MPa√m for increasing Ta content (single-phased up to 26 at.% Ta).

Type
Research Letters
Information
MRS Communications , Volume 9 , Issue 1 , March 2019 , pp. 375 - 380
Copyright
Copyright © Materials Research Society 2019 

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