Surface blistering of molybdenum irradiated with 75--350-keV helium ions

Journal Article · Wed Mar 01 04:00:00 EST 1978 · J. Vac. Sci. Technol.; (United States)

DOI:https://doi.org/10.1116/1.569670· OSTI ID:6807080

Fahlstrom, C R; Sinha, M K

Polycrystalline molybedenum samples have been irradiated at room temperature with helium ions of energy from 75 to 350 keV in high vacuum. Irradiation parameters such as ion energy, total dose, and dose rate were varied and surfaces were examined in a scanning electron microscope. The average blister diameter increases with increasing ion energy and the blister number density increases with increasing total dose of helium. The critical dose for blister formation is independent of the beam flux in the range of 6.7 x 10/sup 1/3 to 2 x 10/sup 1/5 ions cm/sup -/2 s/sup -/1. However, the average blister diameter changes with the change of flux. When the molybdenum surface is successively bombarded with varying ion energies, both the diameter and the number density of the blisters is significantly reduced as compared to monoenergetic helium bombardment.

• Research Organization: Department of Physics, North Dakota State University, Fargo, North Dakota 58102
• OSTI ID: 6807080
• Journal Information: J. Vac. Sci. Technol.; (United States), Journal Name: J. Vac. Sci. Technol.; (United States) Vol. 15:2; ISSN JVSTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360106* -- Metals & Alloys-- Radiation Effects
BLISTERS
BUBBLES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DISLOCATIONS
DOSE-RESPONSE RELATIONSHIPS
ELECTRON MICROSCOPY
ELEMENTS
ENERGY RANGE
HELIUM IONS
IRRADIATION
KEV RANGE
LINE DEFECTS
METALS
MICROSCOPY
MOLYBDENUM
PHYSICAL RADIATION EFFECTS
POLYCRYSTALS
RADIATION EFFECTS
REFRACTORY METALS
SURFACES
TRANSITION ELEMENTS