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The Mechanical Behavior and Deformation Mechanisms of Nb-Al-V Alloys

Published online by Cambridge University Press:  15 February 2011

D. K. Tappin ,
D. N. Horspool ,
L. S. Smith  and
M. Aindow
D. K. Tappin
Affiliation:
School of Metallurgy and Materials &IRC in Materials for High Performance Applications, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
D. N. Horspool
Affiliation:
School of Metallurgy and Materials &IRC in Materials for High Performance Applications, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
L. S. Smith
Affiliation:
School of Metallurgy and Materials &IRC in Materials for High Performance Applications, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
M. Aindow
Affiliation:
School of Metallurgy and Materials &IRC in Materials for High Performance Applications, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
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Abstract

A series of Nb-Al-V alloys containing 20–40 at. % V and 10–25 at. % Al have been investigated. The phase distributions in the alloys indicate that Al promotes the formation of the A15 phase whilst V stabilises a B2 phase. Room temperature compression testing revealed that the B2 is inherently ductile such that for the alloys with less than 40% by volume of the A15 phase, strains of over 50% were obtained easily. The 2% offset yield stresses of these alloys did not vary significantly with composition, being 1.2±0.1GPa in each case. TEM studies were used to show that the deformation in the B2 phase occurs predominantly by the glide of screw-type super-partial dislocations with b=l/2<111> on {110} and {112}. In some alloys this dislocation activity was preceded by the formation of pseudo-twins, via a martensitic shear transformation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 671
Copyright
Copyright © Materials Research Society 1997

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References

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