Mechanical properties of amorphous Fe-based melt spun ribbons with Cr additions

The effect of Cr substitution for Fe on the mechanical properties of Fe78−xCrxSi10B12 and Fe77.5−xCrxSi7.5B15 (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 Fe78−xCrxSi10B12 alloys, and from 2.2 GPa (x=0) to 2.9 GPa (x=8) for Fe77.5−x CrxSi7.5B15 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 Fe70Cr8Si10B12 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.