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.
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Acknowledgement
The authors would like to acknowledge helpful discussions with Professors I.P. Jones and H.L. Fraser, the assistance of Dr. P.S. Bate with the mechanical testing, and the provision of laboratory facilities by Professors J.F. Knott and M.H. Lorretto. This work has been carried out with the financial support of the EPSRC and the Ministry of Defence. Technical Monitor for the project was Dr. M.R. Winstone of the DRA Structural Materials Centre, Farnborough.
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Tappin, D.K., Horspool, D.N., Smith, L.S. et al. The Mechanical Behavior and Deformation Mechanisms of Nb-Al-V Alloys. MRS Online Proceedings Library 460, 671–676 (1996). https://doi.org/10.1557/PROC-460-671
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DOI: https://doi.org/10.1557/PROC-460-671