Piezospectroscopic Study of Residual Stresses in Al2O3–ZrO2 Directionally Solidified Eutectics
Piezospectroscopic Study of Residual Stresses in Al2O3–ZrO2 Directionally Solidified Eutectics
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DOI：
10.1111/j.1151-2916.2000.tb01626.x
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发表时间：
2004-12
影响因子：
3.9
通讯作者：
J. A. Pardo;R. I. Merino;V. Orera;J. Peña;C. González;J. Pastor;J. Llorca
中科院分区：
文献类型：
--
作者：
J. A. Pardo;R. I. Merino;V. Orera;J. Peña;C. González;J. Pastor;J. Llorca
采用不同的压电光谱探针，研究了激光浮区法制备的Al2O3-ZrO2（单斜氧化锆，m-ZrO2）和Al2O3-ZrO2 (Y2O3)（四边形氧化锆，t-ZrO2）纤维共晶的残余热弹性应力。假设纤维中的应力状态是横向各向同性的，利用红宝石（Al2O3相中的Cr3+）的r线发光来确定Al2O3基体中的应力。蓝宝石基体在Al2O3-m-ZrO2共晶中受到拉伸应力。在有序区域，静水应力分量达到1.13 GPa。相比之下，蓝宝石在Al2O3-ZrO2 （Y2O3）纤维中处于压缩状态，在有序区和无序区流体静力应力均为−0.37 GPa。基于自洽法，通过热弹性分析解释了微观结构对残余应力的影响。此外，在具有不同显微结构和热弹性应力的样品中，测量了m-ZrO2的拉曼光谱和Al2O3的417 cm−1拉曼模式。在拉伸-压缩范围内，al2o3 - r线的频移与417 cm−1拉曼模式的频移之间存在近似的线性关系。
The residual thermoelastic stresses were studied in Al2O3–ZrO2 (monoclinic zirconia, m-ZrO2) and Al2O3–ZrO2(Y2O3) (tetragonal zirconia, t-ZrO2) fibrous eutectics that were produced via the laser floating zone method, using different piezospectrosocopic probes. The luminescence of the R-lines of ruby (Cr3+ in Al2O3 phase) was used to determine the stresses in the Al2O3 matrix, assuming that the stress state in the fibers was transversally isotropic. The sapphire matrix was subjected to tensile stresses in the Al2O3–m-ZrO2 eutectics. The hydrostatic stress component attained a value of 1.13 GPa in well-ordered regions. In contrast, sapphire was in compression in the Al2O3–ZrO2(Y2O3) fibers, and the hydrostatic stress was −0.37 GPa in both ordered and disordered regions. The influence of the microstructure in the residual stresses was explained through thermoelastic analyses, based on a self-consistent method. In addition, the Raman spectra of m-ZrO2 and the 417 cm−1 Raman mode of Al2O3 were measured in samples that showed different microstructures and thermoelastic stresses. An approximate linear dependence was observed in the tension–compression range between frequency shifts of the Al2O3R-lines and those of the 417 cm−1 Raman mode.