Accession Number : AD0823495

Title :   SILICON CARBIDE WHISKER-METAL MATRIX COMPOSITES.

Descriptive Note : Final rept. 1 Jul 66-31 Aug 67,

Corporate Author : MELPAR FALLS CHURCH VA

Personal Author(s) : Divecha, A. ; Lare, P. ; Hahn, H.

Report Date : 30 OCT 1967

Pagination or Media Count : 170

Abstract : Several metals and alloys were examined for reinforcement with alpha SiC whiskers. High-temperature matrices were found to degrade the whiskers significantly. Aluminum-silicon alloys and magnesium and its alloys were found compatible at up to their respective solidus temperatures. Hypoeutectic aluminum-silicon alloy composites were investigated in detail. A linear relationship between whisker loading up to about 35 v/o tensile strength was established with reproducible consistency in aluminum -2.5 w/o silicon matrix composites. Classified +60 mesh-length whiskers and 10 microns matrix powder yielded notably higher tensile properties. At 38 v/o, tensile strengths of 68,000 psi were obtained. In 25 v/o whisker composites, strengths of about 13,000 psi at 500 C were recorded consistently. Heat treatable aluminum alloy composites yielded erratic results due to an uncontrolled aging response of the matrix during conventional heat treatments. (Author)

Descriptors :   *CARBIDES), *METALS), *REINFORCING MATERIALS), (*SILICON, (*WHISKERS(CRYSTALS), (*COMPOSITE MATERIALS, AGE HARDENING, DEGRADATION, MAGNESIUM ALLOYS, TENSILE PROPERTIES, PRESSES(MACHINERY), NICKEL ALLOYS, VAPOR PLATING, CHROMIUM, DENSITY, METALLOGRAPHY, IRON ALLOYS, ALUMINUM ALLOYS, COMPATIBILITY, AGING(MATERIALS), ROLLING(METALLURGY), TITANIUM ALLOYS, DEPOSITION, DISTILLATION, TEST METHODS, HEAT TREATMENT.

Subject Categories : Laminates and Composite Materials
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE