Abstract
The blistering and flaking behaviour of metallic glasses Fe 80B 20, Fe 40Ni 40B 20, Fe 40Ni 40P 14B 6 and Fe 40Ni 38Mo 4B 18 under helium ion bombardment at room temperature has been investigated. A trend of continuous layer-by-layer surface erosion of metallic glasses due to repetitive exfoliation was observed. Results as a function of projectile energy (50 keV ⩽ E ⩽ 150 keV) and helium current density (10–100 μ/cm 2) showed that the critical dose and the blister size dependence on these parameters is similar to crystalline solids. However, unlike in crystalline materials, cold work of Fe 40Ni 40P 14B 6 to 30% thickness reduction did not seem to affect the surface erosion behaviour. A comparative study of the same alloy Fe 40Ni 40P 14B 6 in amorphous and thermally crystallized forms showed about 50% higher resistance against blistering for the former. Microstructural investigations revealed helium bubble formation as a precursor stage to blistering but irradiation-induced partial crystallization was not observed for these metallic glasses.
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