Tensile Behavior of Nickel-Base Composite Materials.
DREXEL UNIV PHILADELPHIA PA DEPT OF MATERIALS ENGINEERING
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The tensile behavior of Ni-Mo and Nichrome-W filamentary composites V sub f or 0.2 has been examined with particular reference to the effect of prolonged exposure at temperatures up to 1473 K. Composites were tested above and below the DBTT of the wire reinforcement to give a direct comparison of ductile matrix-ductile fiber and ductile matrix-brittle fiber behavior. Data were analyzed in terms of micromechanical models of composite deformation. For ductile fiber reinforcement, the rule of mixtures analysis of composite tensile strength must allow for a reduction in V sub f fue to interface reaction, and for a decrease in the fracture strain of the composite compared to the as-fabricated condition. With brittle reinforcement, following elevated temperature exposure, composite tensile strength was lower than that of the matrix material fiber-matrix reaction induces notch sensitivity in the fibers and alters constituent properties such that the fiber content required for reinforcement is raised to a level above that existing in the nickel or nichrome matrix. The nature and extent of the interface-reaction products were characterized and the effectiveness of diffusion barrier coatings of Y203 appraised. Author
- Laminates and Composite Materials