SILICON CARBIDE WHISKER-METAL MATRIX COMPOSITES.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 30, 1967
- Accession Number
- AD0823495
Entities
People
- A. Divecha
- H. Hahn
- P. Lare
Organizations
- Melpar