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Microstruciture and Properties of Intermetallic Matrix Composites Produced by Reaction Synthesis

Published online by Cambridge University Press:  15 February 2011

D. E. Alman ,
J. A. Hawk ,
C. P. Dogan ,
M. Ziomek-Moroz  and
A. V. Petty Jr.
D. E. Alman
Affiliation:
U.S Bureau of Mines, Albany Research Center, Albany, Oregon 97321
J. A. Hawk
Affiliation:
U.S Bureau of Mines, Albany Research Center, Albany, Oregon 97321
C. P. Dogan
Affiliation:
U.S Bureau of Mines, Albany Research Center, Albany, Oregon 97321
M. Ziomek-Moroz
Affiliation:
Department of Materials Science and Engineering, Oregon Graduate Institute of Science and Technology, Beaverton, Oregon 97006
A. V. Petty Jr.
Affiliation:
U.S Bureau of Mines, Albany Research Center, Albany, Oregon 97321
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Abstract

In this US Bureau of Mines study, a variety of TiAl based composites were produced in situ by reaction synthesis. Mixtures of elemental Ti, Al and B and Ti, Al, and Si powders were reactive hot-pressed to form TiAl reinforced with 10, 20, 25 or 60 vol. pct. TiB2 or Ti5Si3. Microstructural evaluation of the resultant composites confirmed that the reaction products were primarily TiAl and TiB2 or Ti5S3, with a small amount of Ti3Al. The hot-press temperature and pressure had a significant effect on the density of the composites. In general, higher temperatures and initiating the reaction under pressure promoted dense composites. Room temperature biaxial flexure strength tests indicated that the addition of the reinforcing phases can improve the strength of TiAl. Potentiodynamic experiments revealed that TiAl, TiAl+TiB2 and TiAl+Ti5Si3 composites display active-passive corrosion behavior in both acidic and alkaline solutions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 350: Symposium U – Intermetallic Matrix Composites III , 1994 , 25
Copyright
Copyright © Materials Research Society 1994

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References

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