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