In Situ Transmission Electron Microscopy for Ultrahigh Temperature Mechanical Testing of ZrO2
- Univ. of Illinois at Urbana-Champaign, IL (United States). Dept. of Materials Science and Engineering; Energy and Nuclear Research Inst. (IPEN), Sao Paulo (Brazil); Univ. of California, Davis, CA (United States). Dept. of Materials Science and Engineering
- Energy and Nuclear Research Inst. (IPEN), Sao Paulo (Brazil)
- Univ. of California, Davis, CA (United States). Dept. of Materials Science and Engineering
- Univ. of Illinois at Urbana-Champaign, IL (United States). Dept. of Materials Science and Engineering
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
This work demonstrates a novel approach to ultrahigh-temperature mechanical testing using a combination of in situ nanomechanical testing and localized laser heating. Here, the methodology is applied to characterizing and testing initially nanograined 10 mol % Sc2O3-stabilized ZrO2 up to its melting temperature. The results suggest that the low-temperature strength of nanograined, d < 50 nm, oxides is not influenced by creep. Tensile fracture of ZrO2 bicrystals produce a weak-temperature dependence suggesting that grain boundary energy dominates brittle fracture of grain boundaries even at high homologous temperatures; for example, T = 2050 °C or T ≈ 77% Tmelt. 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.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); US Army Research Office (ARO); Brazilian National Council for Scientific and Technological Development (CNPq); Sao Paulo Research Foundation (FAPESP)
- Grant/Contract Number:
- AC04-94AL85000; NA-0003525; FWP-15013170; DMR-1922867; W911NF1810361; W911NF1710026; 236631/2012-8; 305889/2018-4; 2016/06205-1; 2017/25501-3
- OSTI ID:
- 1634229
- Report Number(s):
- SAND-2020-5989J; 686654
- Journal Information:
- Nano Letters, Vol. 20, Issue 2; ISSN 1530-6984
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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