Publication | Closed Access
Improvement of high-temperature creep resistance in fine-grained Al2O3 by Zr4+ segregation in grain boundaries
62
Citations
0
References
1997
Year
Materials EngineeringMaterials ScienceZr4+ SegregationAluminium NitrideGrain BoundariesEngineeringPhysicsSevere Plastic DeformationOxide ElectronicsMaterial AnalysisOxidation ResistanceApplied PhysicsAl2 O3Alloy DesignMicrostructure-strength RelationshipFine-grained Al2o3Zirconium IonsMicrostructure
The high-temperature creep resistance in Al2 O3 is improved greatly by ZrO doping. Zirconium ions are found to be segregated in Al O grain boundaries. The activation energies for creep in high-purity Al2 O3 and ZrO-doped Al O are - estimated to be 430 and 650 kJ mol1, respectively. The grain boundary diffusivity of Al ions is expected to be reduced by the segregation of Zr4+ in the grain boundaries.