Tsai Yi-Yun, Lee Tzer-Min, Kuo Jui-Chao
Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, 701, Taiwan.
Institute of Oral Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
Micron. 2021 Jun;145:103053. doi: 10.1016/j.micron.2021.103053. Epub 2021 Mar 5.
The destabilization problem is of importance in the application of yttria-stabilized zirconia (YSZ) bio-ceramic in the oral environment due to phase transformation between tetragonal to monoclinic. Thus, in this study, the lattice distortion induced by hydrothermal aging in yttria-stabilized zirconia (YSZ) was investigated, in which YSZ specimens were subjected to hydrothermal-aging treatment for 0-48 h. The Kikuchi-band based method was employed to calculate the lattice distortion after phase transformation and the results from EBSD were compared with these obtained by X-ray diffraction (XRD). Both measurement methods showed a similar tendency of the lattice change in the a- and c- axes. EBSD results showed that the strain rates were 7.98 % and -5.03 % at the a- and c-axes, respectively. A significant decrease in the c/a ratio from 1.429 to 1.257 for the tetragonal matrix after 48 h aging is observed, which indicated Kikuchi-band based method using EBSD technique can successfully determine the local strain in tetragonal matrices.
由于四方相到单斜相的相变，失稳问题在氧化钇稳定氧化锆（YSZ）生物陶瓷在口腔环境中的应用中具有重要意义。因此，在本研究中，研究了水热老化在氧化钇稳定氧化锆（YSZ）中引起的晶格畸变，其中YSZ试样进行了0至48小时的水热老化处理。采用基于菊池带的方法计算相变后的晶格畸变，并将电子背散射衍射（EBSD）的结果与X射线衍射（XRD）获得的结果进行比较。两种测量方法在a轴和c轴上均显示出相似的晶格变化趋势。EBSD结果表明，a轴和c轴上的应变速率分别为7.98%和-5.03%。观察到48小时老化后四方基体的c/a比从1.429显著降低到1.257，这表明使用EBSD技术的基于菊池带的方法可以成功地确定四方基体中的局部应变。
