闪光稳定状态下氧化锆弹性模量的软化

R. Kathiria, R. Raj
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引用次数: 0

摘要

一旦被电场和电炉加热触发,多晶硅就可以在关闭电炉的情况下保持恒定的闪光状态。试样的温度现在可以通过流过它的电流来控制。我们报道了在这种闪光状态下测量3mol %氧化钇稳定氧化锆的弹性模量。测量了弹性模量的显著软化。模量随温度的升高而急剧下降。相反,标称模量在较高温度下趋于稳定。闪蒸作用下机械阻尼增大。实验是通过沿悬臂梁的部分长度激活闪光来完成的。采用模态有限元模拟分析方法确定闪现截面的模量。温度是根据黑体辐射模型估计的,也用高温计测量的。这项工作是由最近的理论结果推动的,这些结果表明,在布里渊带边缘附近声子的扩散可以使Frenkel对成核。我们讨论了Frenkel对成核的一种可能的“声子共振”机制。
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Softening of the Elastic Modulus of Zirconia Held in a Steady State of Flash
Once triggered by the application of electric field and furnace heating, a polycrystal can be held in a constant state of flash with the furnace switched off. The specimen temperature can now be controlled by the current flowing through it. We report on the measurement of the elastic modulus of 3 mol% yttria stabilized zirconia in such a state of flash. Significant softening of the elastic modulus is measured. The decline in the modulus steepens with temperature. In contrast the nominal modulus tends to stabilize at higher temperatures. The mechanical damping increases under flash. The experiments were done by activating the flash along a partial length of a cantilever beam. Modal finite element analysis simulations were used to determine the modulus in the flashed section. The temperature was estimated from a black body radiation model and also measured with a pyrometer. This work was driven by recent theoretical results that show that Frenkel pairs can be nucleated by the proliferation of phonons near the edge of the Brillouin zone. We discuss a possible "phonon resonance" mechanism for the nucleation of Frenkel pairs.
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Softening of the Elastic Modulus of Zirconia Held in a Steady State of Flash
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