AN EXAMINATION OF FACTORS THAT AFFECT THE MECHANICAL PROPERTIES OF BORON-ALUMINUM COMPOSITES.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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Filaments and diffusion-bonded boron-aluminum composites were tested to examine filament degradation and a synergistic elastic modulus. The as-received, heat-treated in air, in vacuum, and leached filament strengths were found to be 464, 439, 407, 371 ksi respectively. Filament fractures were observed in the composites. The Poissons ratio approached the rule-of-mixtures value implying no transverse constraint. Tests demonstrated complete load transfer across a filament fracture and that no minimum volume fraction is required for strengthening. Multi-layer specimens demonstrated no synergism in modulus or strength but reflected filament degradation. The rule-of-mixtures accurately predicts the elastic modulus for low volume fraction composites. Author
- Metallurgy and Metallography