Study on Correlation between Minimum Irradiation Area and Microstructure in Micro X-Ray Stress Measurement
Study on Correlation between Minimum Irradiation Area and Microstructure in Micro X-Ray Stress Measurement
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微X射线应力测量中最小照射面积与显微组织的相关性研究
DOI：
10.2472/jsms.53.758
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
Y. Sakaida
中科院分区：
文献类型：
--
作者：
Y. Sakaida
为了建立一种最佳的微束X射线局部应力测量方法，测量了三种多晶Al_2O_3和Al_2O_3-10ol%ψ_2的德拜-谢勒环随X射线辐照面积的变化关系。每一幅德拜-谢勒环图像都是通过铜-钾α或铁-钾α辐射从像板上获得。从测量的德拜-谢勒环图像中还检测到了X射线衍射图。然后，对每种材料的X射线照射量和X射线衍射谱之间的相关性进行了检验。确定了最小X射线辐照体积，即X射线衍射图和局部应力场与模型材料中大量颗粒的X射线衍射图和局部应力场近似相等。结果发现，最小辐照体积对应于约104个颗粒随机存在的显微组织体积。此外，随着X射线入射角的变化，最小辐照体积在约2.8×103颗粒的体积处降低。最后，证实了利用同步辐射微束能成功地测量多晶Al_2O_3的局部应力。
In order to establish an optimum local stress measurement by the sin2ψ method using micro X-ray beam, Debye-Scherrer rings of three kinds of polycrystalline Al2O3, and Al2O3-10vol%ZrO2 were measured as a function of X-ray irradiation area. Each Debye-Scherrer ring image was obtained from image plate by Cu-Kα or Fe-Kα radiations. X-ray diffraction pattern was also detected from the measured Debye-Scherrer ring image. And then, a correlation between X-ray irradiation volume and X-ray diffraction pattern was examined for each material. The minimum X-ray irradiation volume, where X-ray diffraction pattern and local stress field were approximately equivalent to that from a myriad of grains existed in model materials, was determined. As a result, the minimum irradiation volume was found to correspond to the microstructural volume in which about 104 grains existed randomly. Furthermore, by oscillating the X-ray incident angle, the minimum irradiation volume lowered at the volume in which about 2.8×103 grains existed. Finally, it was confirmed that local stress of polycrystalline Al2O3 could be successfully measured by Synchrotron micro X-ray beam.