Abstract
The effect of Cr substitution for Fe on the mechanical properties of Fe 78− x Cr x Si 10B 12 and Fe 77.5− x Cr x Si 7.5B 15 (0⩽ x⩽8) melt spun alloy series is presented. The tensile strength of the as-cast ribbons increased slightly with the substitution of Fe by Cr from 1.5 GPa ( x=0) to 2.5 GPa ( x=8) for Fe 78− x Cr x Si 10B 12 alloys, and from 2.2 GPa ( x=0) to 2.9 GPa ( x=8) for Fe 77.5− x Cr x Si 7.5B 15 alloys. The Vickers microhardness remained almost constant for all Cr contents. In addition, the effect of annealing (30 min at various temperatures) on both, the tensile stress and microhardness of Fe 70Cr 8Si 10B 12 alloy was also determined. A gradual decrease with increasing annealing temperature was observed at the former and an increasing trend with higher anneal temperatures for the latter. Results are explained in terms of enhanced bond interaction metal–metalloid and of structural relaxation after heat treatment.
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