Publikationen

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

Autor(en)
Anna N. Dorner, Katharina Werbach, Gregory E. Hilmas, William G. Fahrenholtz
Abstrakt

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(en)
Dynamik Kondensierter Systeme
Externe Organisation(en)
Missouri University of Science and Technology
Journal
Journal of the European Ceramic Society
Band
41
Seiten
3219-3226
Anzahl der Seiten
8
ISSN
0955-2219
DOI
https://doi.org/10.1016/j.jeurceramsoc.2020.12.049
Publikationsdatum
2021
Peer-reviewed
Ja
ÖFOS 2012
103009 Festkörperphysik, 205005 Gesteinshüttenkunde
Schlagwörter
ASJC Scopus Sachgebiete
Ceramics and Composites, Materials Chemistry
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/effect-of-tantalum-solid-solution-additions-on-the-mechanical-behavior-of-zrb2(a91238d1-c558-4bb6-a255-25c41d3f4eb8).html