铁弹性陶瓷畴形核的临界分解剪切应力准则的评价

Charles S. Smith, Q. Rizzardi, R. Maaß, J. Krogstad
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引用次数: 0

摘要

通过单轴微尺度压缩实验,对单晶、铁弹性、四边形、铈钛稳定氧化锆的力学行为进行了评价。变形后的单晶微柱表现出多种变形模式的特征,包括孪晶(铁弹性畴形核)、位错塑性和微裂纹。在早期的工作中,揭示了孪生的开始如何遵循一个关键的剪切应力定律,非常类似于施密德定律,我们测试了这个模型,并表明它并不适用于本文提供的数据。我们将这种差异归因于这样一个事实,即在室温下,多种变形机制可以在不同的微柱中活跃,甚至在同一微柱中,这是通过透射电镜显示的。虽然在如此低的同质温度下,这些机制之间的潜在相互作用知之甚少,但它们的共存意味着仅晶体取向不足以预测小尺度单晶中的铁弹性畴成核行为。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluating a Critical Resolved Shear Stress Criterion for Domain Nucleation in Ferroelastic Ceramics
The mechanical behavior of single crystal, ferroelastic, tetragonal, ceria-titania-stabilized zirconia is evaluated through uniaxial micro-scale compression experiments. The deformed single crystal micropillars exhibit characteristics of several deformation modes, including twinning (ferroelastic domain nucleation), dislocation plasticity, and microcracking. Following earlier work that revealed how the onset of twinning obeys a critical resolved shear-stress law, much akin to Schmid's law, we test this model and show that it does not hold for the data presented herein. We ascribe this discrepancy to the fact that multiple deformation mechanisms can be active in different micropillars and even in the same micropillars at room temperature, which is revealed by transmission electron microscopy. Whilst little is known about the potential interactions between these mechanisms at such low homologuous temperatures, their coexistence implies that crystal orientation alone is not sufficient to predict ferroelastic domain nucleation behavior in small-scale single crystals.
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