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High-Temperature Creep of Nb-Al-V Alloys

Published online by Cambridge University Press:  10 February 2011

Tie-Sheng Rong  and
Mark Aindow
Tie-Sheng Rong
Affiliation:
School of Metallurgy and Materials & IRC in Materials for High Performance Applications The University of Birmingham, Birmingham B 15 2TT, UK
Mark Aindow
Affiliation:
School of Metallurgy and Materials & IRC in Materials for High Performance Applications The University of Birmingham, Birmingham B 15 2TT, UK
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Abstract

Nb-15A1-20V alloys with about 45% by volume of an A15 phase in a B2 matrix have been subjected to creep deformation at temperatures between 1000°C and 1200°C and stresses from 80 MPa to 240 MPa in vacuum. The creep curves show a rapid transition from primary to steady-state creep with a well-defined activation energy. Microstructural observations show that the creep deformation occurs mainly in the B2 matrix and is controlled by dislocation mechanisms. Samples which had been coldrolled and annealed to reduce the size of A 15 precipitates and increase the yield strength were found to have lower creep resistance than those with unrefined microstructures. The significance of these observations for the creep mechanisms is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK8.28.1
Copyright
Copyright © Materials Research Society 1999

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References

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