Abstract
A 57Fe Mossbauer effect study of the as-quenched, annealed and crystallised Fe95-xW5Bx metallic glasses with x=15, 20 and 25 has been performed. For the as-quenched alloys, the fitting of the room-temperature Mossbauer spectra by the Window method yields the most probable and average hyperfine magnetic fields which appear to increase linearly with increasing boron concentration. The opposite trend observed in the variation of Mossbauer hyperfine parameters with temperature of annealing for the x=15 and 25 alloys at high annealing temperatures is due to changes taking place in the dense random packing structure of the alloys at the composition with x approximately=20. The Mossbauer studies of the crystallised Fe80W5B15 specimen show that the alloy undergoes a eutectic type of crystallisation. The different crystalline phases that emerge during the crystallisation of the present system are found to be alpha -Fe, Fe2B, (Fe0.8W0.2)3B and a nonmagnetic FeWB phase.
Published Version
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