Blistering of molybdenum-base alloy TZM under helium ion bombardment
Polycrystalline TZM alloy samples have been irradiated at room temperature with helium ions of energy from 75--350 keV in high vacuum. Irradiation parameters such as ion energy, total dose, and ion flux were varied, and the surfaces were examined in a scanning electron microscope. The critical dose for blister formation was found to lie between 4 and 7 x 10/sup 17/ ions cm/sup -2/ and is independent of the beam flux in the range 6.7 x 10/sup 13/--2 x 10/sup 15/ ions cm/sup -2/ s/sup -1/. However, within this flux range the average blister diameter increases with the flux and the blister number density, and the exfoliation maximizes at an intermediate flux. Blister-cover thickness for TZM is found to be less than that for molybdenum, although the average blister diameter for the two materials differs only at the highest energy used. When the TZM surface is successively bombarded with varying ion energies, blistering is reduced compared to monoenergetic helium bombardment, but this reduction is not as substantial as for pure molybdenum.
- Research Organization:
- Department of Physics, North Dakota State University, Fargo, North Dakota 58105
- OSTI ID:
- 5398147
- Journal Information:
- J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 51:6; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360106* -- Metals & Alloys-- Radiation Effects
ALLOY-TZM
ALLOYS
BLISTERS
COLLISIONS
CRYSTALS
ELECTRON MICROSCOPY
ELECTRON SCANNING
ENERGY RANGE
HELIUM IONS
ION COLLISIONS
IRRADIATION
KEV RANGE
MEDIUM TEMPERATURE
MICROSCOPY
MOLYBDENUM ALLOYS
MOLYBDENUM BASE ALLOYS
PHYSICAL RADIATION EFFECTS
POLYCRYSTALS
RADIATION EFFECTS
SURFACES
TITANIUM ALLOYS
ZIRCONIUM ALLOYS