Influence of transmutation on microstructure, density, change, and embrittlement of vanadium and vanadium alloys irradiated in HFIR
- Hokkaido Univ., Sapporo (Japan)
- Japan Atomic Energy Research Institute, Tokai (Japan)
- Oak Ridge National Lab., TN (United States)
- Pacific Northwest Lab., Richland, WA (United States)
Addition of 1 at.% nickel to vanadium and V-10Ti, followed by irradiation along with the nickel-free metals in HFIR to 2.3 x 10{sup 22}n cm{sup {minus}2}, E>0.1MeV (corresponding to 17.7 dpa) at 400{degrees}C, has been used to study the influence of helium on microstructural evolution and embrittlement. Approximately 15.3% of the vanadium transmuted to chromium in these alloys. The {approximately}50 appm helium generated from the {sup 58}Ni(n,{gamma}){sup 59}Ni(n,{alpha}){sup 56}Fe sequence was found to exert much less influence than either the nickel directly or the chromium formed by transmutation. The V-10Ti and V-10Ti-1Ni alloys developed an extreme fragility and broke into smaller pieces in response to minor physical insults during density measurements. A similar behavior was not observed in pure V or V-1Ni. Helium`s role in determination of mechanical properties and embrittlement of vanadium alloys in HFIR is overshadowed by the influence of alloying elements such as titanium and chromium. Both elements have been shown to increase the DBTT rather rapidly in the region of 10% (Cr + Ti). Since Cr is produced by transmutation of V, this is a possible mechanism for the embrittlement. Large effects on the DBTT may have also resulted from uncontrolled accumulation of interstitial elements such as C, N, and O during irradiation.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- AC06-76RL01830; AC05-84OR21400
- OSTI ID:
- 47757
- Report Number(s):
- DOE/ER-0313/16; ON: DE95003404; TRN: 95:011287
- Resource Relation:
- Other Information: PBD: Sep 1994; Related Information: Is Part Of Fusion materials semiannual progress report for the period ending March 31, 1994; PB: 534 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Transmutation-induced embrittlement of V-Ti-Ni and V-Ni alloys in HFIR
Characterization of nickel-doped ferritic steels for helium production through HFIR irradiation