Corrosion Behavior of Squeeze Cast Aluminum Metal Matrix Composites
NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIR VEHICLE AND CREW SYSTEMS TECHNOLOGY DEPT
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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 andor 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 6061Al2O3 and Al 356SiC. 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 Al203Oi 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.
- Laminates and Composite Materials