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Interdiffusion and Phase Relations in Ti-Aluminide/NB/Ti-Aluminide Composite Structures

Published online by Cambridge University Press:  15 February 2011

Z. Ma ,
M. A. Dayananda  and
L. H. Allen
Z. Ma
Affiliation:
Department of Materials Science and Engineering, University of Illinois, Urbana, IL 61801.
M. A. Dayananda
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, IN 47907.
L. H. Allen
Affiliation:
Department of Materials Science and Engineering, University of Illinois, Urbana, IL 61801.
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Abstract

We have studied interdiffusion and phase relations in two titanium aluminide/Nb/titanium aluminide composite structures at 1100 °C using solid state diffusion approach. The composite structures were prepared with two practical intermetallic alloys, γ (Ti-48Al-2Nb-0.3Ta, in at.%) alloy and super-α2 (Ti-25Al-10Nb-3V-1Mo, in at.%) alloy, and pure Nb sheet by diffusion bonding technique. The interfacial microstructures evolved during thermal diffusion annealing were characterized using optical microscopy, SEM, TEM and X-ray diffraction. The effect of Nb on the phase stabilities of two intermetallic alloys and the phase relations among different phases formed in the diffusion zone due to interdiffusion were analyzed in terms of rules of diffusion paths on the basis of the observed diffusion structures and experimental diffusion paths.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 273: Symposium Q – Intermetallic Matrix Composites II , 1992 , 59
Copyright
Copyright © Materials Research Society 1992

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References

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