Abstract
The densification of a fine-grained, high-purity aluminum oxide powder under hot isostatic pressing (HIP) has been found to occur by interface-reaction controlled grain-boundary diffusion. We discuss geometries and dislocation mechanics for this process for both the initial and final stages of densification and develop constitutive equations for densification rate as a function of density, materials constants, and experimental parameters. The model is used to explain the results of several HIP experiments at pressures of 34–102 MPa and temperatures of 1273–1423 K. Sources of variation from sample to sample are discussed. An analysis is made of the sensitivity of the model to its adjustable parameters. Alternative explanations for the experimental data are discussed and found to be inadequate.
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