Experimental Study of Micro Displacement Field of Microstate of Crack Tips of Ceramics Plasticized with Zirconia and Stabilized by Yttrium Oxide - Application of Digital Image Correlation Method Based on Analysis by Scanning Electron Microscope

摘要

To study the deformation reaction of different metallurgical phases of the micron structure of crack tips of zirconia ceramics in the loading state, the paper presents the micro experimental study based on the digital correlated method of analysis by scanning electron microscope on the displacement field in the micro areas of crack tip of the specimen of the Y_2O_3-Z_rO_2 toughened ceramic with the simple edge notch beam method and under the action of three-point bending loads. First, SEM analyses was made on the local area of the crack tip of a specimen's polished surface before and after loads are applied to the specimen, thus obtaining two SEM images, one before the application of the loads and another after the load application, which contained their displacement information. Then, digital correlation calculations were made between the gray scales of the pixels of the two images in order to obtain the microscopic displacement fields of the crack tips in the microstate, thus unveiling the deformation modality and displacement response of different metallurgical phases of the crack tips of zirconia ceramics when subject to loads. The results of the studies will provide foundations and basis for further research in the mechanical properties of the ceramics with Y_2O_3-Z_rC>2 and their relationship with the microstructures.