Accession Number : ADA332713
Title : De-sintering, A Phenonmena Concurrent with Densification Within Powder Compacts: A Review
Corporate Author : CALIFORNIA UNIV SANTA BARBARA DEPT OF MATERIALS
Personal Author(s) : Lange, F. F.
PDF Url : ADA332713
Report Date : 1994
Pagination or Media Count : 12
Abstract : A morphological instability characterized by the separation of grain pairs and the disappearance of grain boundaries is a common feature in polycrystalline bodies that are constrained from skrinking during mass transport. This instability, know as de-sintering, occurs during grain coarsening as sequentially observed for thin films with columnar microstructures constrained by a substrate, fibers with a 'bamboo' microstructure constrained by a matrix, and powder matrices within composites. De-sintering is a common phenomena in partially dense, polycrystalline bodies; it occurs concurrently with densification phenomena and is emphasized in composites where the partially dense matrix is constrained from shrinking by a reinforcement network. De-sintering occurs in any lower density region were shrinkage is constrained by the average shrinkage of the body.
Descriptors : *POWDER METALLURGY, *POLYCRYSTALLINE, FIBERS, MICROSTRUCTURE, COMPOSITE MATERIALS, MORPHOLOGY, THIN FILMS, SUBSTRATES, MASS TRANSFER, LOW DENSITY, INSTABILITY, GRAIN BOUNDARIES, SINTERING, SHRINKAGE.
Subject Categories : Metallurgy and Metallography
Distribution Statement : APPROVED FOR PUBLIC RELEASE