The mechanical behavior and deformation mechanisms of Nb-Al-V alloys

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 stabilizes a B2 phase. Room temperature compression testing revealed that the B2 is inherently ductil...

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Bibliographic Details
Main Authors Tappin, D.K., Horspool, D.N., Smith, L.S., Aindow, M.
Format Book
LanguageEnglish
Published United States Materials Research Society, Pittsburgh, PA (United States) 31.12.1997
Subjects
ALUMINIUM ALLOYS
DEFORMATION
EXPERIMENTAL DATA
MATERIALS SCIENCE
MECHANICAL PROPERTIES
MICROSTRUCTURE
NIOBIUM ALLOYS
PHASE STUDIES
VANADIUM ALLOYS
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Summary: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 stabilizes 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 {+-} 0.1 GPa 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 = 1/2 on {l_brace}110{r_brace} and {l_brace}112{r_brace}. In some alloys this dislocation activity was preceded by the formation of pseudo-twins, via a martensitic shear transformation.
Bibliography:CONF-961202-
ISSN:1067-9995