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- W2138334598 abstract "Alumina and Al2O3/ZrO2 (1 to 10 vol%) composite powders were mixed and consolidated by a colloidal method, sintered to >98% theoretical density at 1550°C, and subsequently heat-treated at temperatures up to 1700°C for grain-size measurements. Within the temperature range studied, the ZrO2 inclusions exhibited sufficient self-diffusion to move with the Al2O3 4-grain junctions during grain growth. Growth of the ZrO2, inclusions occurred by coalescence. The inclusions exerted a dragging force at the 4-grain junctions to limit grain growth. Abnormal grain growth occurred when the inclusion distribution was not sufficiently uniform to hinder the growth of all Al2O3 grains. This condition was observed for compositions containing ≤2.5 vol% ZrO2, where the inclusions did not fill all 4-grain junctions. Exaggerated grains consumed both neighboring grains and ZrO2, inclusions. Grain-growth control (no abnormal grain growth) was achieved when a majority (or all) 4-grain junctions contained a ZrO2 inclusion, viz., for compositions containing ≥5 vol% ZrO2. For this condition, the grain size was inversely proportional to the volume fraction of the inclusions. Since the ZrO2 inclusions mimic voids in all ways except that they do not disappear, it is hypothesized that abnormal grain growth in single-phase materials is a result of a nonuniform distribution of voids during the last stage of sintering." @default.
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- W2138334598 date "2006-10-04" @default.
- W2138334598 modified "2023-10-17" @default.
- W2138334598 title "Hindrance of Grain Growth in Al2O3 by ZrO2 Inclusions." @default.
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- W2138334598 doi "https://doi.org/10.1111/j.1151-2916.1984.tb19734.x" @default.
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