Microstructure of V-4Cr-4Ti alloy after low-temperature irradiation by ions and neutrons

Technical Report · Sun Mar 01 04:00:00 EST 1998

DOI:https://doi.org/10.2172/335374· OSTI ID:335374

Gazda, J.; Meshii, M. ^[1]; Chung, H. M. ^[2]

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1. Northwestern Univ. (United States)
2. Argonne National Lab., IL (United States)

Mechanical properties of V-4Cr-4Ti alloy were investigated after low-temperature (<420 C) irradiation. The effects of fast neutrons at 390 C were investigated by irradiation to {approx}4 dpa in the X530 experiment in the EBR-II reactor; these tests were complemented by irradiation with single (4.5-MeV Ni{sup ++}) and dual ion beams (350-keV He{sup +} simultaneously with 4.5-MeV Ni{sup ++}). TEM observations showed the formation of a high density of point-defect clusters and dislocation loops (<30 nm diameter) distributed uniformly in the specimens. Mechanical-property testing showed embrittlement of the alloy. TEM investigations of deformed microstructures were used to determine the causes of embrittlement and yielded observation of dislocation channels propagating through the undeformed matrix. Channels are the sole slip paths and cause early onset of necking and loss of work-hardening in this alloy. Based on a review of the available literature, suggestions are made for further research of slip localization in V-base alloys.

• Research Organization: Oak Ridge National Lab., TN (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 335374
• Report Number(s): DOE/ER--0313/23; ON: DE98004697
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CHROMIUM ALLOYS
CRYSTAL DEFECTS
EXPERIMENTAL DATA
MECHANICAL PROPERTIES
MICROSTRUCTURE
PHYSICAL RADIATION EFFECTS
TEMPERATURE RANGE 0400-1000 K
THERMONUCLEAR REACTOR MATERIALS
TITANIUM ALLOYS
VANADIUM BASE ALLOYS