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Diffusion-bonded composites of unalloyed aluminum and boron filament are characterized in light of mechanical, metallographic, and radiographic experimental evidence. The stress-strain behavior of five-layer boron-aluminum composites with from 12 to 15 volume per cent boron is discussed in detail. Four stages of stress-strain behavior are proposed and discussed. The importance of synergism in these composites is discussed in terms of the 20 to 30 per cent increase over the rule of mixtures which was experimentally observed for both modulus and tensile strength. It is shown that Poisson's ratio differences between the components lead to the development of significant transverse stresses. These put the matrix into balanced biaxial and possibly triaxial tension. It is concluded that boron-aluminum composites can contribute significantly to advancing materials technology.
composites, metal matrix, micromechanics, boron, diffusion bonding, aluminum, evaluation
Stuhrke, W. F.
1st Lieutenant, USAF, project engineer, Wright-Patterson Air Force Base, Ohio