Abstract
The phase conditions of amorphous Fe100-xBx alloys (x<or=25) irradiated with 40 keV He+ ions were studied by depth-selective conversion electron Mossbauer spectroscopy (DCEMS). A gas-flow-type proportional counter was used in the DCEMS measurements and the method is shown to be useful to detect the phase changes in the near-surface regions of the alloys. It is found that the crystalline phase of alpha -iron is induced on the irradiated surface of amorphous Fe80B20 and Fe85B15 but not on Fe75B25 and that the extent of the amorphous-to-crystalline transformation depends on the depth from the surface, decreasing towards the interior of the sample. It is likely that the irradiation leads to separation of the amorphous structure into boron-depleted and boron-enriched regions. It is suggested that an amorphous structure exists which is stable against irradiation after the formation of alpha -iron.
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