Corrosion behavior of squeeze-cast-aluminum metal-matrix composites. Final report

Technical Report · Sun Dec 01 04:00:00 EST 1991

OSTI ID:7070615

Agarwala, V S; Fabiszewski, A S

Corrosion behavior of metal matrix composites (MMC) vary greatly with the reinforcement material type, processing conditions and methods of fabrication into engineering parts. The corrosion susceptibilities for the MMC arise from the segregations of the reinforcement material during fluid flow (extrusion) and/or processing, and from the resulting compositional differences in the alloy, the matrix material. These differences sets-up galvanic cells and cause preferential corrosion. The metal matrix composites studied were Al 6061/Al2O3 and Al 356/SiC. In particular, the effects of near-net-shape processing called squeeze casting (solidification of liquid under pressure) was investigated. The results showed that regions which were clustered with SiC or (Al203)Oi were microstructurally sensitive to preferential corrosion. Electrochemical-potentiodynamic polarization and controlled potential corrosion behavior measurements were made and related to microstructural segregation through metallographic optical microscopic analysis.

• Research Organization: Naval Air Development Center, Warminster, PA (United States). Air Vehicle and Crew Systems Technology Dept.
• OSTI ID: 7070615
• Report Number(s): AD-A-250486/8/XAB; NADC--91122-60
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360604* -- Materials-- Corrosion
Erosion
& Degradation
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPOSITE MATERIALS
CORROSION
ELEMENTS
FABRICATION
FLUIDS
LIQUIDS
MATERIALS
MATRIX MATERIALS
METALS
OXIDES
OXYGEN COMPOUNDS
POLARIZATION
REINFORCED MATERIALS
SEMIMETALS
SHAPE
SILICON
SILICON CARBIDES
SILICON COMPOUNDS