Irradiation-induced precipitation and mechanical properties of vanadium alloys at <430 C

Technical Report · Tue Sep 01 04:00:00 EDT 1998

DOI:https://doi.org/10.2172/330611· OSTI ID:330611

Chung, H. M.; Gazda, J.; Smith, D. L. ^[1]

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1. Argonne National Lab., IL (United States)

Recent attention to V-base alloys has focused on the effect of low-temperature (<430 C) irradiation on tensile and impact properties of V-4Cr-4Ti. In previous studies, dislocation channeling, which causes flow localization and severe loss of work-hardening capability, has been attributed to dense, irradiation-induced precipitation of very fine particles. However, efforts to identify the precipitates were unsuccessful until now. In this study, analysis by transmission electron microscopy (TEM) was conducted on unalloyed V, V-5Ti, V-3Ti-1Si, and V-4Cr-4Ti specimens that were irradiated at <430 C in conventional and dynamic helium charging experiments. By means of dark-field imaging and selected-area-diffraction analysis, the characteristic precipitates were identified to be (V,Ti{sub 1{minus}x})(C,O,N). In V-3Ti-1Si, precipitation of (V,Ti{sub 1{minus}x})(C,O,N) was negligible at <430 C, and as a result, dislocation channeling did not occur and work-hardening capability was high.

• Research Organization: Oak Ridge National Lab., TN (United States)
• OSTI ID: 330611
• Report Number(s): DOE/ER--0313/24; ON: DE98007433
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CHROMIUM ALLOYS
DISLOCATIONS
EXPERIMENTAL DATA
MECHANICAL PROPERTIES
MICROSTRUCTURE
PHYSICAL RADIATION EFFECTS
PRECIPITATION
STRAIN HARDENING
THERMONUCLEAR REACTOR MATERIALS
TITANIUM ALLOYS
VANADIUM BASE ALLOYS