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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.

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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