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Mathematical model for uniform huge grains growth (from the polycrystalline systems to the monocrystals)

S. CONSTANTINESCU1, I. MERCIONIU1, N. POPESCU-POGRION1,*

Affiliation

  1. National Institute for Materials Physics, Magurele, Romania

Abstract

Despite many investigations already performed with respect to sintering stability and grain growth vs. annealing conditions - in low yttrium doped α- Al2O3 (150 ppm) - some fundamental questions are still open. These questions concern mainly the influence of small level of impurities at grain boundary in the sintering behavior and grains growth of the materials, i.e. the microstructure function of the annealing time at annealing temperature of 16500 C. The low yttrium doped α- Al2O3 (150 ppm) samples were sintered and annealed at high temperatures. Besides conventional micro structural studies, such as grain diameter and grain size functions of distribution of the annealing temperature were studied by electron microscopy investigations and statistical measurement. The implications of the different microstructures with respect to micro structural stability have discussed and compared to observations described in the literature..

Keywords

Low Y doped α-Al2O3, Grain growth vs. annealing, Uniform huge grains, SEM, Modeling of the grain growth.

Submitted at: Aug. 24, 2008
Accepted at: Nov. 11, 2008

Citation

S. CONSTANTINESCU, I. MERCIONIU, N. POPESCU-POGRION, Mathematical model for uniform huge grains growth (from the polycrystalline systems to the monocrystals), Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 11, pp. 3083-3085 (2008)