Abstract
The accelerated grain growth during high temperature deformation in high purity alumina was investigated. The high purity alumina with an initial grain size about 0.6 μm was characterized by a high work-hardening rate after initial yielding at temperatures of 1250–1500°C. The work hardening was related to the grain growth during deformation. The grain growth was accelerated by deformation which was analyzed to be of strain-enhanced type, because the grain size increase could be described as a function of strain but was not sensitive to temperature. The strain-enhanced grain growth in high purity Al 2O 3 and MgO-doped Al 2O 3 was discussed in comparison with the data for a tetragonal zirconia polycrystal reported previously.
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