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Title:Modeling of interaction between densification mechanisms in powder compaction
Author(s):Subramanian, Sankara J.; Sofronis, Petros
Subject(s):Powder Compaction
Abstract:Sinter-forging is a common means of forming ceramic or inter-metallic components for modern technological applications such as advanced structural materials, magneti materials, thin ceramic layers on substrates and nanocomposites. Micrometer /nanometer-sized powders provide significant advantages in terms of reduced processing pressures/ temperatures and increased control over the final microstructure. Although extensive research in the past twenty years has identified and analyzed the individual mechanisms acting at the microscale during densification, no comparable progress has been made towards understanding the full spectrum of interactions between the mechanisms. In this paper, a micromechanical model of powder consolidation is presented. It accounts for the elastic and power-law creep deformation of the bulk material along with stress-driven diffusion on the interparticle contacts and curvature-driven surface diffusion along the pore surfaces. The finite element method is used to obtain the time-dependent deformation of the powder aggregate from which macroscopic quantities such as relative density, densification rate, and strain rate as well as microscopic quantities such as volumetric flux and pore surface curvature are calculated. Comparisons are made with existing models and experimental data from the consolidation of micron-sized Al2O3 and TiAl.
Issue Date:1999-05
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 907
Genre:Technical Report
Sponsor:Energy Department DEFG02-91ER45439
Rights Information:Copyright 1999 Board of Trustees of the University of Illinois
Date Available in IDEALS:2021-11-04

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  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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