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Microstructure Evolution and Texture Development in Hot-Rolled Super α2 Titanium Aluminide

Published online by Cambridge University Press:  01 January 1992

C. J. Yu ,
D. Zhao ,
J. J. Valencia  and
P. K. Chaudhury
C. J. Yu
Affiliation:
Concurrent Technologies Corporation, 1450 Scalp Avenue, Johnstown, PA 15904, U.S.A.
D. Zhao
Affiliation:
Concurrent Technologies Corporation, 1450 Scalp Avenue, Johnstown, PA 15904, U.S.A.
J. J. Valencia
Affiliation:
Concurrent Technologies Corporation, 1450 Scalp Avenue, Johnstown, PA 15904, U.S.A.
P. K. Chaudhury
Affiliation:
Concurrent Technologies Corporation, 1450 Scalp Avenue, Johnstown, PA 15904, U.S.A.
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Abstract

Textural and microstructural changes in super α2 titanium aluminide (Ti-14Al-20Nb-3.2V-2Mo in wt%) subjected to hot-rolling process were investigated. X-ray pole figure measurements on sheet specimens were conducted to quantify the crystallographic texture development during the hot-rolling process. Results show strong texture development in both the α2and β phases. High temperature compression tests at various strain rates were conducted on specimens taken from hot-rolled plates, and the microstructural changes induced by the deformation were examined using transmission electron microscopy (TEM). Results indicated that deformation at low strain rates retains the hot rolled microstructure with elongated and strongly aligned α2 phase. At higher strain rates, the characteristic α2 phase appears to break down into equiaxed and/or recrystallized grains during deformation. Furthermore, results are correlated between the macroscopic orientations of texture components and the local orientations of α2 phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 927
Copyright
Copyright © Materials Research Society 1995

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References

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