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

摘要

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-6061aluminum composites were determined. Interfacial microstructures and composite fatigue resistance were compared with those previously determined for current,state-of-the-art boron-6061aluminum 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)