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Title: Hot isostatic pressing (HIP) of powder mixtures and composites: Packing, densification, and microstructural effects

Abstract

Hot isostatic pressing (HIP) of powder mixtures (containing differently sized components) and of composite powders is analyzed. Recent progress, including development of a simple scheme for estimating radial distribution functions, has made modeling of these systems practical. Experimentally, powders containing bimodal or continuous size distributions are observed to hot isostatically press to a higher density tinder identical processing conditions and to show large differences in the densification rate as a function of density when compared with the monosize powders usually assumed for modeling purposes. Modeling correctly predicts these trends and suggests that they can be partially, but not entirely, attributed to initial packing density differences. Modeling also predicts increased deformation in the smaller particles within a mixture. This effect has also been observed experimentally and is associated with microstructural changes, such as preferential recrystallization of small particles. Finally, consolidation of a composite mixture containing hard, but deformable, inclusions has been modeled for comparison with existing experimental data. Modeling results match both the densification and microstructural observations reported experimentally. Densification is retarded due to contacts between the reinforcing particles which support a significant portion of the applied pressure. In addition, partitioning of deformation between soft matrix and hard inclusion powders resultsmore » in increased deformation of the softer material.« less

Authors:
;  [1]
  1. Univ. of Rochester, NY (United States). Department of Mechanical Engineering
Publication Date:
OSTI Identifier:
6205323
Resource Type:
Journal Article
Journal Name:
Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)
Additional Journal Information:
Journal Volume: 24A:6; Journal ID: ISSN 0360-2133
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COMPOSITE MATERIALS; HOT WORKING; PRESSING; POWDER METALLURGY; MATHEMATICAL MODELS; POWDERS; BULK DENSITY; CRYSTALLIZATION; DISTRIBUTION; MICROSTRUCTURE; MORPHOLOGICAL CHANGES; PARTICLE SIZE; DENSITY; FABRICATION; MATERIALS; MATERIALS WORKING; METALLURGY; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; SIZE; 360601* - Other Materials- Preparation & Manufacture

Citation Formats

Li, E K.H., and Funkenbusch, P D. Hot isostatic pressing (HIP) of powder mixtures and composites: Packing, densification, and microstructural effects. United States: N. p., 1993. Web. doi:10.1007/BF02668202.
Li, E K.H., & Funkenbusch, P D. Hot isostatic pressing (HIP) of powder mixtures and composites: Packing, densification, and microstructural effects. United States. doi:10.1007/BF02668202.
Li, E K.H., and Funkenbusch, P D. Tue . "Hot isostatic pressing (HIP) of powder mixtures and composites: Packing, densification, and microstructural effects". United States. doi:10.1007/BF02668202.
@article{osti_6205323,
title = {Hot isostatic pressing (HIP) of powder mixtures and composites: Packing, densification, and microstructural effects},
author = {Li, E K.H. and Funkenbusch, P D},
abstractNote = {Hot isostatic pressing (HIP) of powder mixtures (containing differently sized components) and of composite powders is analyzed. Recent progress, including development of a simple scheme for estimating radial distribution functions, has made modeling of these systems practical. Experimentally, powders containing bimodal or continuous size distributions are observed to hot isostatically press to a higher density tinder identical processing conditions and to show large differences in the densification rate as a function of density when compared with the monosize powders usually assumed for modeling purposes. Modeling correctly predicts these trends and suggests that they can be partially, but not entirely, attributed to initial packing density differences. Modeling also predicts increased deformation in the smaller particles within a mixture. This effect has also been observed experimentally and is associated with microstructural changes, such as preferential recrystallization of small particles. Finally, consolidation of a composite mixture containing hard, but deformable, inclusions has been modeled for comparison with existing experimental data. Modeling results match both the densification and microstructural observations reported experimentally. Densification is retarded due to contacts between the reinforcing particles which support a significant portion of the applied pressure. In addition, partitioning of deformation between soft matrix and hard inclusion powders results in increased deformation of the softer material.},
doi = {10.1007/BF02668202},
journal = {Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)},
issn = {0360-2133},
number = ,
volume = 24A:6,
place = {United States},
year = {1993},
month = {6}
}