Micro-mechanisms of deformation in SiC/Al composites. Final report, 1 August 1984-31 August 1987

Technical Report · Mon Aug 31 00:00:00 EDT 1987

OSTI ID:5278641

Papazian, J M; Levy, A; Adler, P N

The deformation mechanisms of aluminum-matrix composites containing SiC whiskers or particulate were investigated both experimentally and analytically to determine factors critical to their mechanical behavior. The effects of the discontinuous SiC on age-hardening behavior; the influence of silicon carbide morphology; interactions between SiC dispersoids and matrix precipitates, and dislocations were considered. Two matrix alloys were investigated: a solution-hardened 5456 alloy containing no matrix precipitates; and a 2124 alloy that could be aged and cold worked to contain different matrix-precipitate microstructures and dislocation contents. The influence of SiC on the age-hardening behavior of 2124 was evaluated using differential scanning calorimetry. The precipitation sequence in the composites was found to be very similar to that in SiC-free material prepared by either powder or ingot metallurgy. Both whiskers and particulate increased the quench sensitivity of 2124 by causing the precipitation of GPB zones and S' during the quench from solution heat treatment. This effect was independent of quench rate.

• Research Organization: Grumman Corp., Bethpage, NY (USA). Corporate Research Center
• OSTI ID: 5278641
• Report Number(s): AD-A-188282/8/XAB; RE-738
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
AGE HARDENING
COMPOSITE MATERIALS
DEFORMATION
CALORIMETRY
CASTINGS
COLD WORKING
DISLOCATIONS
DISPERSION HARDENING
DISPERSIONS
MATRIX MATERIALS
MICROSTRUCTURE
MORPHOLOGY
PROGRESS REPORT
REINFORCED PLASTICS
SILICON CARBIDES
ALLOYS
CARBIDES
CARBON COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DOCUMENT TYPES
FABRICATION
HARDENING
LINE DEFECTS
MATERIALS
MATERIALS WORKING
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
REINFORCED MATERIALS
SILICON COMPOUNDS
SYNTHETIC MATERIALS
360603* - Materials- Properties