期刊
MRS COMMUNICATIONS
卷 9, 期 1, 页码 375-380出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1557/mrc.2019.5
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资金
- Plansee Composite Materials GmbH
- Oerlikon Balzers Surface Solutions AG
- Christian Doppler Gesellschaft
Based on density functional theory, we recently suggested that metastable alpha-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 a-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 similar to 41 GPa (WB2) to similar to 45 GPa (W0.74Ta0.26B2). In situ micromechanical cantilever bending tests exhibit fracture toughnessK(IC )values of 3.7 to 3.0 MPa root m for increasing Ta content (single-phased up to 26 at.% Ta).
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