Samples of an Fe75Si10B15 metallic glass have been isothermally annealed at 723 and 793 K. At the lower temperature, the crystallisation products consisted of Fe3Si dendrites and a fine eutectic product while at the higher temperature, an additional phase crystallised from the matrix after approximately 50% transformation. This phase has an orthorhombic structure and has not been reported previously in the Fe–Si–B system. Such variations in crystallisation product may be a feature of many metallic glass systems, but a significant range of annealing temperatures, beyond that usually used for kinetic studies, may be necessary to detect them.
MST/785
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