SILICON CARBIDE WHISKER-METAL MATRIX COMPOSITES.

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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 vo tensile strength was established with reproducible consistency in aluminum -2.5 wo silicon matrix composites. Classified 60 mesh-length whiskers and 10 microns matrix powder yielded notably higher tensile properties. At 38 vo, tensile strengths of 68,000 psi were obtained. In 25 vo 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

Author(s):
Divecha, A. ; Lare, P. ; Hahn, H.
Author Organization(s):
MELPAR FALLS CHURCH VA
Descriptive Note:
Final rept. 1 Jul 66-31 Aug 67,
Pagination:
0170

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
6339-F, AFML-TR-67-321
Contract/Grant Number(s):
AF 33(615)-5431
Task Number(s):
735107
Project Number(s):
AF-7351
Monitor Series:
TR-67-321
 Subject Terms
Communities of Interest:
Advanced Electronics
Descriptor(s):
*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
Field(s)/Group(s):
Laminates and Composite Materials, Crystallography
Keyword(s):
KANTHAL, TITANIUM ALLOY 6AL 4V, VAPOR DEPOSITION
Report Date:
1967 Oct 30