Abstract
High-resolution studies of interface microstructures provide unique information on the role of interfaces in the mechanical behavior of boron-aluminum composites; some results related to diffusion kinetics, phase transformations, and bond integrity are presented below. Composite specimens were thinned for transmission electron microscopy by ion-bombardment.The degradation of boron filaments in aluminum alloys is the result of chemical interaction over distances estimated to be < 2000 A (angstroms). Figure 1a shows a representative interface microstructure in a boron-6061 aluminum composite which was degraded during diffusion bonding at 500°C, 1 hr, 4000 psi. Aluminum boride(s) formed at intermittent sites at interfaces and reduced the ultimate tensile strength to only ≲ 60% of predicted values. A comparable interface is shown in Figure lb in a composite which was fabricated at 475°C; interface reaction products did not form and mechanical properties indicated that no degradation occurred.
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