材料期刊网

The thermal stability of nanocrystalline Fe78B13Si9, prepared by crystallization, has been studied by in situ heating TEM observations at temperatures from 450 to 650-degrees-C. The nanocrystalline FeBSi alloy, with an average grain size of about 30 nm, was found to be thermally stable with nondetectable grain growth up to temperature of 450-degrees-C. The grain growth results can be discussed in terms of the mechanisms of precipitation, solute, vacancies and grain boundary triple junctions which may be operative in reducing the overall mobility of the interfaces. At the elevated temperature of about 650-degrees-C, secondary recrystallization occurred with abnormal growth of a few grains.