Abstract
Amorphous ribbon and powder of the alloy Fe 75Si 15B 10 were prepared by chill casting and by spark erosion respectively. Samples of ribbon and powder were heated to temperatures corresponding to some fraction of crystallization in the differential scanning calorimeter. Other samples were heated isothermally in vacuo or in purified nitrogen to cause grain growth. The crystallization temperatures, T x measured by differential scanning calorimetry were higher for the largest particles than for the ribbon, and T x and the heat of crystallization increased with decreasing particle size. The first crystals to form in the ribbon, as determined using transmission electron microscopy, were the stable phases α-Fe and Fe 3Si. At higher temperatures, Fe 2B and Fe 3(Si, B) crystals appeared together with the Fe 3Si as the final crystallization product. The first crystals to form in the spark-eroded powder were metastable body-centered tetragonal Fe 3B. At higher temperatures, Fe 3Si, Fe 3(Si, B) and Fe 2B crystals formed. It was concluded that FeB “clusters” in the more chemically disordered particles act as nuclei for the formation of the Fe 3B crystals. The more chemically ordered ribbon forms only the equilibrium or stable phases on crystallization.
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