Atom probe field ion microscope study of the range and diffusivity of helium in tungsten
A time-of-flight (TOF) atom-probe field-ion microscope (FIM) specifically designed for the study of defects in metals is described. With this automated system 600 TOF min/sup -1/ can be recorded and analyzed. Performance tests of the instrument demonstrated that (1) the seven isotopes of molybdenum and the five isotopes of tungsten can be clearly resolved; and (2) the concentration and spatial distribution of all constitutents present at levels greater than 0.05 at. % in a W--25 at. % Re, Mo--1.0 at. % Ti, Mo--1.0 at. % Ti--0.08 at. % Zr (TZM), a low swelling stainless steel (LS1A) and a metallic glass (Metglas 2826) can be measured. The effect of the rate of field evaporation on the quantitative atom probe analysis of a Mo--1.0 at. % Ti alloy and a Mo--1.0 at. % Ti--0.08 at. % Zr alloy was investigated. As the field evaporation rate increased the measured Ti concentration was found to also increase. A simple qualitative model was proposed to explain the observation. The spatial distribution of titanium in a fast neutron irradiated Mo--1.0 at. % Ti alloy has been investigated. No evidence of Ti segregation to the voids was detected nor has any evidence of significant resolution of Ti from the TiC precipitates been detected. A small amount of segregation of carbon to a void was detected.
- Research Organization:
- Cornell Univ., Ithaca, NY (USA). Materials Science Center
- DOE Contract Number:
- EY-76-S-02-3158
- OSTI ID:
- 6427378
- Report Number(s):
- COO-3158-63
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360106* -- Metals & Alloys-- Radiation Effects
640301 -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALLOYS
HELIUM IONS
ION MICROSCOPES
ION MICROSCOPY
MICROSCOPES
MICROSCOPY
MOLYBDENUM ALLOYS
PERFORMANCE
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RANGE
RHENIUM ALLOYS
TITANIUM ALLOYS
TUNGSTEN ALLOYS