Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 40, Issue 14, Pages 4774-4782Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.04.023
Keywords
Fracture strength; fracture surface; microcantilever bending; high-entropy carbide; fracture toughness
Categories
Funding
- Slovak Grant Agency for Science [VEGA 2/0163/16, VEGA 2/0091/18, APVV-14-0385, APVV-15-0469]
- M-ERA.NET2 (DURACER)
- Operational Program Research and Development financed through European Regional Development Fund [ITMS: 26220220186]
- Hungarian Ministry of Human Capacities [783-3/2018/FEKUTSRAT]
- Engineering and Physical Sciences Research Council (EPSRC), MASSIVE project [EP/L017695/1]
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The fracture behaviour of (Hf-Ta-Zr-Nb)C high-entropy carbide grains was investigated by microcantilever bending experiments, and fracture related properties (e.g. strength, toughness) were determined using linear beam theory. Microcantilevers were FIB-milled from large grains with {001} and {101} orientations and were subjected to micro-bending experiments. SEM based fractographic analysis of the broken cantilevers revealed that approximately half of them fractured at the fixing position at FIB-induced surface cracks, while the rest of the beams failed at small cracks located at submicron size pores or inclusions. In all cases, fracture occurred on the {001} cleavage plane. The fracture strength of beams fractured at the fixing position was 11.8 +/- 0.2 GPa, while the strength of the beams that failed at submicron defects was in the range of 3.8-8.9 GPa. The calculation of stress concentration in the vicinity of pores revealed that local stress field exceeded the value that induced cracking in 'defect free' beams.
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