Correlation of microstructure and tensile and swelling behavior of neutron-irradiated vanadium alloys Page: 3 of 26
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reported earlier. Density measurements showed that irradiation-induced
swelling of vanadium-based alloys can be effectively inhibited by addition of
>5 wt.% Ti in the alloy. For example, swelling of V-base alloys containing >5
wt.% Ti was <1%, in comparison with swelling as high as 3-4% for V,
V~14Cr, V-15Cr-lTi, and V-3Ti-lSi alloys upon irradiation at 420°C up to
114 dpa.1 The superior resistance to void swelling of several high-Ti alloy
specimens was associated in a previous investigation5 with irradiation-
induced formation of high-density precipitates that are spherical in
morphology and approximately <15 nm in diameter. It was suggested in the
study that the large interface area between the precipitates and matrix could
serve as an effective sink to vacancies, thereby inhibiting void nucleation and
growth. However, the very fine spherical precipitates could not be
identified ip the study.
In a similar effort to provide an understanding of significant ductility
degradation of several promising alloys of the V-13.5Cr-5Ti type, Gelles et
al.11 investigated microstructural evolution of the alloys following irradiation
at 600°C in the FFTF/MOTA. They observed that specimen microstructure
was characterized by two types of precipitates that formed in high density,
i.e., (1) fine needlelike precipitates approximately <20 nm thick and <200
nm long and (2) spherical precipitates <15 nm in diameter. Based on its
morphology, the latter appears to be same type of precipitate as those
reported in Ref. 5 and correlated to the superior swelling resistance of some
high-Ti alloys. The former type of precipitate was also reported by Loomis
and Smith7 and by Ohnuki et al.12 in some high-Ti alloys irradiated at 600°C;
however, neither type precipitate could be identified.
Impact tests were also conducted by Cannon et al.10 on the V-13.5Cr-
5Ti alloys, which exhibited significant degradation of ductility in tensile
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Chung, H. M. & Smith, D. L. Correlation of microstructure and tensile and swelling behavior of neutron-irradiated vanadium alloys, article, October 1, 1991; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1100195/m1/3/: accessed March 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.