Local microstructural modification in dynamically consolidated metal powders

Journal Article · Sat Sep 01 04:00:00 EDT 1984 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02666349· OSTI ID:5056470

Gourdin, W H

Powders of 4330V steel, aluminum-6 pct silicon, and copper have been dynamically consolidated under well-characterized conditions using shock waves. Different regions in the final microstructures correlate well with the shock conditions during compaction, demonstrating the importance of the shock history in determining the final microstructure. Martensite is observed to form locally at powder particle surfaces in compacts of 4330V steel, and interparticle melting and rapid resolidification are observed in compacts of aluminum-6 pct silicon. Microprobe analyses of locally melted regions in the aluminum alloy indicate a homogeneous distribution of 6 pct silicon, well above the maximum equilibrium solid solubility. Comparison with the structure of ''splat caps'' found in the starting powder, suggests that locally melted regions experience a cooling rate comparable to that obtained in splat quenching. The extent of martensite formation and local melting are in good agreement with current models for energy deposition at powder particle surfaces during consolidation. The general implications of the analysis and observations are discussed.

• Research Organization: Lawrence Livermore National Laboratory, Livermore, CA
• OSTI ID: 5056470
• Journal Information: Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 15A:9; ISSN MTTAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
CARBON ADDITIONS
COMPACTING
COMPACTS
COOLING
COPPER ALLOYS
CRYSTAL STRUCTURE
EXPLOSIVES
IRON ALLOYS
IRON BASE ALLOYS
MARTENSITE
MELTING
METALLOGRAPHY
MICROSTRUCTURE
PHASE TRANSFORMATIONS
POWDERS
QUENCHING
SHOCK WAVES
SILICON ALLOYS
SOLIDIFICATION
STEELS
SURFACE PROPERTIES