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

Book · Wed Dec 31 04:00:00 EST 1997

OSTI ID:571899

Tappin, D K; Horspool, D N; Smith, L S; Aindow, M ^[1]

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1. Univ. of Birmingham, Edgbaston (United Kingdom)

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<111> 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.

• OSTI ID: 571899
• Report Number(s): CONF-961202--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
DEFORMATION
EXPERIMENTAL DATA
MECHANICAL PROPERTIES
MICROSTRUCTURE
NIOBIUM ALLOYS
PHASE STUDIES
VANADIUM ALLOYS