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Structure/Property Comparisons in Particulate and Short Fiber γ-Based Titanium Aluminide Composites

  • S. L. Kampe (a1), J. A. Clarke (a1) and L. Christodoulou (a1)

Abstract

The effect of matrix microstructure on the mechanical properties of two model XD titanium aluminide composites containing 7 volume percent of either particulate (TiB2) or short-fiber ((Ti,Nb)By) reinforcement has been evaluated. Subsequent to wrought-processing via isothermal forging, heat treatments were performed to produce either a fully equiaxed or fully lamellar matrix microstructure. The synergism between matrix microstructure and reinforcement type has been evaluated for ambient-temperature tensile ductility and fracture toughness, and 800°C tensile strength and creep rate. Results indicate that overall composite performance is strongly dependent on reinforcement shape, the extent of which depends on the morphology of the matrix microstructure.

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Structure/Property Comparisons in Particulate and Short Fiber γ-Based Titanium Aluminide Composites

  • S. L. Kampe (a1), J. A. Clarke (a1) and L. Christodoulou (a1)

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