Superplastic compression, microstructural analysis and mechanical properties of a fine grain three-phase alumina–zirconia–mullite ceramic composite

The creep behavior, microstructure and mechanical properties of a three-phase 40 vol.% alumina–30 vol.% zirconia–30 vol.% mullite ceramic composite were investigated. This material was made from zirconia (3Y-TZP) and the reaction of nanoscale powders of alumina and a silica sol to form mullite. Only...

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Veröffentlicht in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2005-11, Vol.410, p.134-139
Hauptverfasser: Chen, Tiandan, Mecartney, Martha L.
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Sprache:eng
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Zusammenfassung:The creep behavior, microstructure and mechanical properties of a three-phase 40 vol.% alumina–30 vol.% zirconia–30 vol.% mullite ceramic composite were investigated. This material was made from zirconia (3Y-TZP) and the reaction of nanoscale powders of alumina and a silica sol to form mullite. Only a few small (10–15 nm) silica pockets remained after sintering, although the original amount of silica was 5.9 wt.%. The material demonstrated a steady-state strain rate and showed superplastic flow under compression. Most grains were equiaxed and sharply facetted. Samples quenched from 1450 °C indicated that the high temperature microstructure is similar to the as-sintered state. Dislocations formed in both mullite and zirconia grains during deformation, suggesting that a dislocation mechanism plays a role during superplastic deformation. The hardness was 15 GPa and the fracture toughness was 6.5 MPa m 1/2, with no degradation in properties with 100% deformation.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2005.08.094