In Situ Transmission Electron Microscopy for Ultrahigh Temperature Mechanical Testing of ZrO2.,Nano Letters

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In Situ Transmission Electron Microscopy for Ultrahigh Temperature Mechanical Testing of ZrO2.
Nano Letters ( IF 9.6 ) Pub Date : 2020-01-16 , DOI: 10.1021/acs.nanolett.9b04205
Robson L Grosso _{1,

2,

3} , Eliana N S Muccillo ₂ , Dereck N F Muche ₃ , Gowtham S Jawaharram ₁ , Christopher M Barr ₄ , Anthony M Monterrosa ₄ , Ricardo H R Castro ₃ , Khalid Hattar ₄ , Shen J Dillon ₁

Affiliation

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% 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.

中文翻译：

ZrO2超高温机械测试的原位透射电子显微镜。

这项工作演示了结合使用原位纳米机械测试和局部激光加热进行超高温机械测试的新方法。该方法用于表征和测试最初的纳米颗粒化的10 mol％Sc2O3稳定的ZrO2，直至其熔化温度。结果表明，d <50 nm纳米氧化物的低温强度不受蠕变的影响。ZrO2双晶的拉伸断裂产生的温度依赖性很弱，这表明即使在较高的同源温度下，晶界能仍是晶界脆性断裂的主导。例如，T = 2050°C或T≈77％熔融。这项工作中机械测试的最高温度主要受到样品由于蒸发或熔化而引起的不稳定性的限制，

更新日期：2020-01-17

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