In situ X-ray diffraction of the early stages of the crystallization of Fe80B20 |
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Authors: | C Brizard B Rodricks E Alp R Macharrie |
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Affiliation: | (1) Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, 60439 Argonne, IL, USA;(2) AT&T Bell Laboratories, 07974 Murray Hill, NJ, USA |
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Abstract: | A new technique has been used for the early stages of crystallization of amorphous materials, like metallic alloys. In situ X-ray diffraction has been performed during the early stages of crystallization of Fe80B20. The samples are resistively heated to 600°C in a customized vacuum chamber. A programmable charge-coupled device detector records simultaneously the evolution of the three phases: -Fe, Fe3B and Fe2B in the minute scale. This is the first in situ X-ray diffraction study of this system in these temperature and time scales. Interesting behaviours have been seen: appearance and disappearance of phases, -Fe supersaturation solution in boron (found for the first time in this compound), and migration of B out of the -Fe matrix. The two-dimensional diffraction pictures show topography irregularities indicating crystallite inhomogeneties. |
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