Hydrothermal-aging-induced lattice distortion in yttria-stabilized zirconia using EBSD technique

• Published in: Micron (Oxford, England : 1993) England : 1993), 2021-06, Vol.145, p.103053-103053, Article 103053
• Main Authors: Tsai, Yi-Yun, Lee, Tzer-Min, Kuo, Jui-Chao
• Format: Article
• Language: English
• Subjects: EBSD; Hydrothermal aging; Kikuchi pattern; Lattice distortion; Stress; Yttria-stabilized zirconia
• ISSN: 0968-4328; 1878-4291
• DOI: 10.1016/j.micron.2021.103053

•The hydrothermal-aging induced lattice distortion in YSZ was investigated by XRD and EBSD.•The band-pass filter is introduced to improve the pattern after coating by amorphous layer in non-conductive materials.•The phase-transformation behavior reveals an exponential growth curve which is described using KJMA law.•The distortion strains were 7.98 % and −5.03 % at the a- and c-axes which were investigated by EBSD.•The application of Kikuchi bands to determine lattice distortion in hydrothermally aged YSZ. 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.