Accession Number : AD0775334

Title :   The Fatigue and Impact Resistance of Dual-Matrix Boron-Aluminum Composites.

Descriptive Note : Final rept.,

Corporate Author : MIDWEST RESEARCH INST KANSAS CITY MO

Personal Author(s) : Hancock,James R. ; Shaw,G. Gordon

Report Date : FEB 1974

Pagination or Media Count : 14

Abstract : The effects of a soft, plastic interface zone and of heat treatments on the axial fatigue resistance and on the Charpy impact behavior of boron-6061 aluminum composites were determined. Interfacial microstructures and composite fatigue resistance were compared with those previously determined for current, state-of-the-art boron-6061 aluminum composites. It was concluded that (a) matrix crack-tip stresses are relatively unimportant in determining the axial fatigue resistance of boron-aluminum composites, (b) a soft, plastic interface zone will only be effective in improving fatigue resistance in composites with a high-strength metal matrix having poor toughness, and (c) phase-boundary migration into boron filaments may occur during boron-aluminum interdiffusion instead of inert-marker movement into the aluminum matrix. (Author)

Descriptors :   *COMPOSITE MATERIALS, *ALUMINUM, *BORON, FATIGUE(MECHANICS), IMPACT STRENGTH, TOUGHNESS, DIFFUSION, FIBERS

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE