Details

Autor(en) / Beteiligte

• Grosso, Robson L
• Muccillo, Eliana N. S
• Muche, Dereck N. F
• Jawaharram, Gowtham S
• Barr, Christopher M
• Monterrosa, Anthony M
• Castro, Ricardo H. R
• Hattar, Khalid
• Dillon, Shen J

Titel

In Situ Transmission Electron Microscopy for Ultrahigh Temperature Mechanical Testing of ZrO2

Ist Teil von

• Nano letters, 2020-02, Vol.20 (2), p.1041-1046

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 % 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% T melt. 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.