Dynamic HVEM observations of metals and alloys during in-situ helium ion irradiations

Journal Article · Fri Apr 01 04:00:00 EST 1983 · IEEE Trans. Nucl. Sci.; (United States)

DOI:https://doi.org/10.1109/TNS.1983.4332504· OSTI ID:5866283

Jesser, W A

A 200 kV ion accelerator, with a PIG source for accelerating ionized gases, was coupled to a 500 kV transmission electron microscope in order to investigate the effects of helium irradiation on the development of microstructure in candidate fusion reactor first wall material. The microstructural evolution in nickel and in type 316 stainless steel bombarded by 80 keV helium ions was monitored via video recordings. The effect of specimen thickness and temperature and the effect of plastic deformation during irradiation was considered. In order to conduct these experiments a quantitative load-elongation hot tensile stage was constructed with a capability for monitoring specimen current continuously during the experiment. It was found that surface exfoliation and blistering may occur in specimens thinner than the mean projected range of helium ions. However, in the thinnest specimen regions, surface layer removal is replaced by the bending of individual grains. Blistering apparently can occur when underprssurization of bubbles exists. Plastic deformation during helium ion irradiation can lead to denuded layers adjacent to some grain boundaries and can produce removed surface layers whose thickness is several times greater than the project mean range of the incident helium ions.

• Research Organization: Univ. of Virginia, Charlottesville, VA 22501
• OSTI ID: 5866283
• Journal Information: IEEE Trans. Nucl. Sci.; (United States), Journal Name: IEEE Trans. Nucl. Sci.; (United States) Vol. 30:2; ISSN IETNA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360106* -- Metals & Alloys-- Radiation Effects
ACCELERATORS
ALLOYS
BLISTERS
BUBBLES
CHARGED PARTICLES
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
COUPLING
CRYSTAL STRUCTURE
DEFORMATION
DIMENSIONS
ELEMENTS
ENERGY RANGE
FLUIDS
GASES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HELIUM IONS
ION SOURCES
IONS
IRON ALLOYS
IRON BASE ALLOYS
IRRADIATION
KEV RANGE
KEV RANGE 10-100
MATERIALS
METALS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
MONITORING
NICKEL
NICKEL ALLOYS
NUCLEAR REACTIONS
NUCLEOSYNTHESIS
PENNING ION SOURCES
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
STAINLESS STEEL-316
STAINLESS STEELS
STEELS
SURFACES
TEMPERATURE DEPENDENCE
THERMONUCLEAR REACTIONS
THERMONUCLEAR REACTORS
THICKNESS
TRANSITION ELEMENTS
VIDEO TAPES