Corrosion Behavior of Squeeze Cast Aluminum Metal Matrix Composites

Abstract

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/Al2)O3 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.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1991
Accession Number
ADA250486

Entities

People

  • Alan S. Fabiszewski
  • Vinod S. Agarwala

Organizations

  • Naval Air Warfare Center Warminster

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aircrafts
  • Aluminum Alloys
  • Aluminum Oxides
  • Ceramic Materials
  • Composite Materials
  • Crystal Structure
  • Engineering
  • Materials
  • Materials Engineering
  • Materials Processing
  • Materials Science
  • Metal Matrix Composites
  • Metallurgy
  • Military Aircraft
  • Military Research
  • Silicon Carbide
  • Standards

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.
  • Reinforced Composite Materials