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Effects of Microstructure on the Room-Temperature Strength and Ductility of the Alloy Ti-25Al-10Nb-3V-lMo

Published online by Cambridge University Press:  01 January 1992

Francois-Charles Dary  and
Anthony W. Thompson
Francois-Charles Dary
Affiliation:
Carnegie Mellon University, Materials Science and Engineering Dept., Pittsburgh, PA 15213
Anthony W. Thompson
Affiliation:
Carnegie Mellon University, Materials Science and Engineering Dept., Pittsburgh, PA 15213
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Abstract

The role of the microstructure on the room-temperature tensile properties of the alloy Ti-25Al-10Nb-3V-lMo (at.%) was investigated. A wide spectrum of microstructures was obtained by varying the cooling rate after a solutionizing treatment in the β phase field. The strength was found to increase monotonically with increasing cooling rate. It is proposed that strength is controlled by (α2+βR) boundary strengthening in β-solutionized microstructures. The ductility was observed to go through a maximum at a cooling rate of 1.5°C/s. Different deformation and failure mechanisms were identified, depending on the cooling rate regime, and correlated to the ductility trends. The β2 nature, α2 lath size, α2 lath arrangement and prior β grain boundaries appeared to be the principal features governing die deformation and failure mechanisms.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 703
Copyright
Copyright © Materials Research Society 1995

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References

REFERENCES

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