EFFECT OF Cr ADDITIONS ON THE MECHANICAL PROPERTIES OF SOME AMORPHOUS Fe-BASED MELT-SPUN RIBBONS- P. S.Nnamchi, C.S. Obayi, I.A. Figueroa

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Volume 4, No 1, April 2009

EFFECT OF Cr ADDITIONS ON THE MECHANICAL PROPERTIES OF SOME AMORPHOUS
Fe-BASED MELT-SPUN RIBBONS

P. S.Nnamchi1, 2, C.S. Obayi2, I.A. Figueroa1

ABSTRACT

Chemical bonding is seen as being directly responsible for the observed mechanical properties of material, yet the strengths of materials are controlled by two interacting features of solids, the chemical bonding and the defects present in the material. A correlation between 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 investigated with the aid of the bond interaction parameter e/a. 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–xCrxSi7.5B15 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 Fe70Cr8 Si10B12 alloy was also determined. A gradual decrease with increasing annealing temperature was observed for the former and an increasing trend with higher anneal temperatures for the latter. Results are explained in terms of enhanced metal–metalloid bond interaction and of structural relaxation after heat treatment.ISSN: 2006-1919 (print)

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