Small-scale bicrystal creep experiments were performed on contacts formed via in situ high-temperature diffusion bonding of metal-oxide interfaces including Ag-ZrO₂, Pd-ZrO₂, Pt-ZrO₂, and Ag-high entropy oxide_. This work characterizes deformation and failure at metal-oxide interfaces during mechanical loading. Interfacial sliding can be activated easily, while tensile interfacial creep was not observed at any condition of stress or temperature measured. Plastic strain, instead, localizes within the metal under tensile loading. A variety of mechanisms for plastic strain occur in the metal including lattice dislocation-mediated plasticity, twinning, low-angle grain boundary formation, and low-angle grain boundary creep. Surface and low-angle grain boundary diffusion occur under conditions where no metal-oxide tensile creep is observed, highlighting the significant differences in their interfacial mechanical response. High-temperature interfacial failure occurs when the mean curvature at the contact neck is approximately zero and the applied stresses comparable to brittle fracture stresses. The brittle fracture stresses were measured to be ${\sigma }_f=180\pm 90MPa$${\sigma }_f=180\pm 90MPa$ at the Ag-ZrO₂ interface at $225{}^{\circ }C$$225{}^{\circ }C$, ${\sigma }_f=460\pm 160MPa$${\sigma }_f=460\pm 160MPa$ at the Pd-ZrO₂ interface at $680{}^{\circ }C$$680{}^{\circ }C$, and ${\sigma }_f=640\pm 440MPa$${\sigma }_f=640\pm 440MPa$ at the Pt-ZrO₂ interface at $1010{}^{\circ }C$$1010{}^{\circ }C$.

中文翻译：

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金属氧化物界面处的蠕变和失效


对金属氧化物界面（包括 Ag-ZrO₂、Pd-ZrO₂、Pt-ZrO₂ 和 Ag-high entropy oxide）通过原位高温扩散键合形成的触点进行了小规模双晶蠕变实验这项工作表征了机械加载过程中金属氧化物界面的变形和失效。界面滑动可以很容易地激活，而在任何应力或温度测量条件下均未观察到拉伸界面蠕变。相反，塑性应变位于拉伸载荷下的金属内部。金属中存在多种塑性应变机制，包括晶格位错介导的塑性、孪生、低角度晶界形成和小角度晶界蠕变。表面和低角度晶界扩散发生在未观察到金属氧化物拉伸蠕变的条件下，突出了它们界面力学响应的显着差异。当接触颈部的平均曲率接近零且施加的应力与脆性断裂应力相当时，就会发生高温界面失效。经测量脆性断裂应力 ${\sigma }_f=180\pm 90$ 225&#x2218 Ag-ZrO 2 界面处的 M P a$225{}^{\circ }C$， ${\sigma }_f=460\pm 160米pa$在 Pd-ZrO₂ 界面处为 $680{}^{\circ }C$ 和 ${\sigma }_f=640\pm 440米$Pt-ZrO ₂ 界面处的 P a $1010{}^{\circ }C$。