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The α→γ Transformation During Continuous Cooling in Ti-48 At% Al Alloys

Published online by Cambridge University Press:  01 January 1992

G. Ramanath  and
Vijay K. Vasudevan
G. Ramanath
Affiliation:
Department of Materials Science and Engineering, University of Cincinnati, OH 45221
Vijay K. Vasudevan
Affiliation:
Department of Materials Science and Engineering, University of Cincinnati, OH 45221
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Abstract

The α→ γ transformation in a Ti-48 at% Al alloy was studied by a novel computer interfaced control-cum-data acquisition technique. In situ,real time, high speed measurements of temperature were made in the system engineered for this purpose. The samples were heated by controlled direct resistance heating and gas-jet quenched. Various cooling rates were achieved by control algorithms and controlling the pressure of the quenching medium. Cooling curves and thermal arrest data were used to determine the transformation temperatures and characteristics as a function of cooling rate. Subsequent microstructural analysis by optical microscopy was used to confirm the occurrence of the various transformation modes, namely, lamellar, Widmanstatten and massive. The transformation start and completion temperatures for the various reactions were determined for different cooling rates, and continuous cooling transformation diagrams were determined. The various results are presented and discussed in light of thermodynamic and phase diagram considerations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 223
Copyright
Copyright © Materials Research Society 1995

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References

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