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Grain Boundary Migration in Cubic Zirconia–Yttria Induced by Addition of Magnesia at Varying Concentrations
Author(s) -
Jeong JunWhan,
Yoon DukYong,
Lee JeongYong,
Kim DohYeon
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb05485.x
Subject(s) - grain boundary , materials science , yttria stabilized zirconia , cubic zirconia , solid solution , magnesium , mineralogy , crystallography , composite material , metallurgy , microstructure , chemistry , ceramic
When partially sintered cubic ZrO 2 –10 mol% Y 2 O 3 specimens are heat‐treated at 1500°C with powder mixtures of MgO and ZrO 2 –10Y 2 O 3 at varying ratios, the grain boundaries migrate, leaving behind new solid solutions enriched with MgO but depleted of Y 2 O 3 . With increasing MgO content in the solute source powder, the average migration velocity increases, and the MgO content increases and the Y 2 O 3 content decreases slightly in these new solid solutions. With increasing MgO content in the solute source, the grain boundaries tend to be corrugated and faceted. Migration reversal is also observed at the corrugated boundaries. These variations of the grain boundary migration behavior with the MgO content in the solute source are consistent with the diffusional coherency strain energy as the driving force for the migration.