TY - JOUR
T1 - Importance of grain boundary chemistry on the high-temperature plastic flow in oxide ceramics
AU - Sakuma, T.
AU - Ikuhara, Y.
AU - Takigawa, Y.
AU - Thavorniti, P.
N1 - Funding Information:
The authors would like to express their gratitude for the financial support of the Grant-in-Aid for Scientific Research on the Priority Area ‘Innovation in Superplasticity’ 08242103 and for Development Scientific Research 06555202 from the Ministry of Education, Science and Culture, Japan.
PY - 1997/8/30
Y1 - 1997/8/30
N2 - High-temperature plastic flow associated with grain boundary sliding in fine grained oxides is often very sensitive to a small addition of dopant cation. The dopant effect is examined in high-purity, fine-grained Al2O3 and SiO2-containing tetragonal zirconia polycrystal (TZP). High-temperature flow stress and tensile ductility are dependent on the type of dopant. High-resolution TEM-EDS, TEM-EELS and X-ray photoelectron spectroscopy (XPS) analyses reveal that the dopant cations segregate in grain boundaries and that the grain boundary chemical bonding state changes by the segregation. Grain boundary sliding must be affected seriously by the dopant segregation through the change in chemical bonding state in grain boundaries.
AB - High-temperature plastic flow associated with grain boundary sliding in fine grained oxides is often very sensitive to a small addition of dopant cation. The dopant effect is examined in high-purity, fine-grained Al2O3 and SiO2-containing tetragonal zirconia polycrystal (TZP). High-temperature flow stress and tensile ductility are dependent on the type of dopant. High-resolution TEM-EDS, TEM-EELS and X-ray photoelectron spectroscopy (XPS) analyses reveal that the dopant cations segregate in grain boundaries and that the grain boundary chemical bonding state changes by the segregation. Grain boundary sliding must be affected seriously by the dopant segregation through the change in chemical bonding state in grain boundaries.
KW - Ceramics
KW - Grain boundary segregation
KW - High-temperature plastic flow
KW - Superplasticity
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U2 - 10.1016/s0921-5093(97)00219-0
DO - 10.1016/s0921-5093(97)00219-0
M3 - Article
AN - SCOPUS:0031210233
VL - 234-236
SP - 226
EP - 229
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
ER -