Publications

Effect of tantalum solid solution additions on the mechanical behavior of ZrB<sub>2</sub>

Author(s)
Anna N. Dorner, Katharina Werbach, Gregory E. Hilmas, William G. Fahrenholtz
Abstract

Mechanical properties and microstructure were compared for zirconium diboride and two zirconium diboride solid solutions containing 3 and 6 at% tantalum diboride. X-ray diffraction indicated that the ceramics were nearly phase-pure and that tantalum dissolved into the ZrB2 lattice to form (Zr,Ta)B2 solid solutions. Microstructural analysis indicated that samples achieved nearly full relative density with average grain sizes that ranged from 3−5 μm. The three compositions had similar values of Young's modulus (510−531 GPa), shear modulus (225−228 GPa), Vickers hardness (15.2–16.4 GPa), and flexural strength (391−452 MPa). Fracture toughness ranged from 2.6 to 3.7 MPa m1/2 and with increasing tantalum content, the fracture mode changed from predominantly intergranular to predominantly transgranular. Diboride solid solution materials had comparable properties to the single metal diboride, but differences in microstructure, secondary phases, and strain state among the three ceramics partially obscured the actual effects of the solid solution on fracture behavior.

Organisation(s)
Dynamics of Condensed Systems
External organisation(s)
Missouri University of Science and Technology
Journal
Journal of the European Ceramic Society
Volume
41
Pages
3219-3226
No. of pages
8
ISSN
0955-2219
DOI
https://doi.org/10.1016/j.jeurceramsoc.2020.12.049
Publication date
2021
Peer reviewed
Yes
Austrian Fields of Science 2012
103009 Solid state physics, 205005 Ceramics engineering
Keywords
ASJC Scopus subject areas
Ceramics and Composites, Materials Chemistry
Portal url
https://ucris.univie.ac.at/portal/en/publications/effect-of-tantalum-solid-solution-additions-on-the-mechanical-behavior-of-zrb2(a91238d1-c558-4bb6-a255-25c41d3f4eb8).html