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The High Temperature Behaviour of TiAl Containing Carbide Reinforcements

Published online by Cambridge University Press:  21 February 2011

J. Rösler ,
J. J. Valencia ,
C. G. Levi ,
A. G. Evans  and
R. Mehrabian
J. Rösler
Affiliation:
Materials Department, College of Engineering, University of California, Santa Barbara, CA 93106
J. J. Valencia
Affiliation:
Materials Department, College of Engineering, University of California, Santa Barbara, CA 93106
C. G. Levi
Affiliation:
Materials Department, College of Engineering, University of California, Santa Barbara, CA 93106
A. G. Evans
Affiliation:
Materials Department, College of Engineering, University of California, Santa Barbara, CA 93106
R. Mehrabian
Affiliation:
Materials Department, College of Engineering, University of California, Santa Barbara, CA 93106
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Abstract

The mechanical behaviour of γ-TiAl reinforced with Ti2AIC platelets is investigated in the temperature range between 293K and 1255K. Comparison with the particle-free material of same matrix composition reveals a pronounced strengthening effect of the platelike reinforcements up to about 1000K. However, under creep loading the composite is remarkably weak. It is shown that this weakness is caused by diffusional creep along the particle/matrix interface. Modelling of this process indicates that the dimensions of the Ti2AlC particles (thickness d=lμm, length l=20μm) are too small to avoid this unwanted deformation mechanism. It is concluded that thicknesses well above 10±m are needed to maintain reinforcement strengthening at high temperature in this system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 194: Symposium R – Intermetallic Matrix Composites I , 1990 , 241
Copyright
Copyright © Materials Research Society 1990

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