Residual stresses in Alb>2b>Ob>3b>-ZrOb>2b> (3 mol.%Yb>2b>Ob>3b>) directionally solidified eutectic ceramics as a function of temperature

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• 作者：J. Ramí ; rez-Rico^a ; ^jrr@us.es ; J. Martí ; nez-Fernandez^a ; J.I. Peñ ; a^b ; D. Singh^c ; J. Routbort^d
• 关键词：Residual Stress ; Al2O3 ; ZrO2 ; Composites ; Directionally solidified eutectics
• 刊名：Materials Science and Engineering ; A
• 出版年：2012
• 期刊代码：61_09215093
• 类别：ms
• 出版时间：15 April, 2012
• 卷：541
• 期：Complete
• 页码：61-66
• 文件大小：1245 K

摘要

Directionally solidified eutectics are in situ composites grown from the melt. Due to the differences in the thermoelastic properties of the different phases present in the material, these composites often exhibit residual stresses that can affect their mechanical properties. In this work we use neutron diffraction to investigate residual stresses in Alb>2b>Ob>3b>-ZrOb>2b> eutectic composites as a function of temperature, for samples processed at two different growth rates, 10 mm/h and 750 mm/h. Our results show that the stress-free temperature is in the range of 1200 卤 200 掳C. We explain the experimental observations based on the thermoelastic properties of the phases in the material and confirm our measurements using a simple, self-consistent model.