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

Published online by Cambridge University Press:  21 February 2011

S. L. Kampe,
J. A. Clarke and
L. Christodoulou
S. L. Kampe
Affiliation:
Martin Marietta Laboratories 1450 S. Rolling Road Baltimore, Maryland 21227
J. A. Clarke
Affiliation:
Martin Marietta Laboratories 1450 S. Rolling Road Baltimore, Maryland 21227
L. Christodoulou
Affiliation:
Martin Marietta Laboratories 1450 S. Rolling Road Baltimore, Maryland 21227
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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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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 194: Symposium R – Intermetallic Matrix Composites I , 1990, 225
Copyright
Copyright © Materials Research Society 1990

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