In Situ Transmission Electron Microscopy for Ultrahigh Temperature Mechanical Testing of ZrO<sub>2</sub>.
biomechanical · Level V
Where this comes from
- Record sourced from PubMed, PMID 31928016.
- Also identified by DOI 10.1021/acs.nanolett.9b04205.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
This work demonstrates a novel approach to ultrahigh-temperature mechanical testing using a combination of in situ nanomechanical testing and localized laser heating. The methodology is applied to characterizing and testing initially nanograined 10 mol % Sc<sub>2</sub>O<sub>3</sub>-stabilized ZrO<sub>2</sub> up to its melting temperature. The results suggest that the low-temperature strength of nanograined, <i>d</i> < 50 nm, oxides is not influenced by creep. Tensile fracture of ZrO<sub>2</sub> bicrystals produce a weak-temperature dependence suggesting that grain boundary energy dominates brittle fracture of grain boundaries even at high homologous temperatures; for example, <i>T</i> = 2050 °C or <i>T</i> ≈ 77% <i>T</i><sub>melt</sub>. The maximum temperature for mechanical testing in this work is primarily limited by the instability of the sample, due to evaporation or melting, enabling a host of new opportunities for testing materials in the ultrahigh-temperature regime.