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

Journal Article · Tue Jun 01 00:00:00 EDT 1993 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02668202· OSTI ID:6205323

Li, E K.H.; Funkenbusch, P D ^[1]

---

1. Univ. of Rochester, NY (United States). Department of Mechanical Engineering

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.

• OSTI ID: 6205323
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 24A:6; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
BULK DENSITY
COMPOSITE MATERIALS
CRYSTALLIZATION
DENSITY
DISTRIBUTION
FABRICATION
HOT WORKING
MATERIALS
MATERIALS WORKING
MATHEMATICAL MODELS
METALLURGY
MICROSTRUCTURE
MORPHOLOGICAL CHANGES
PARTICLE SIZE
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POWDER METALLURGY
POWDERS
PRESSING
SIZE