Torsional elastic behaviour in Metglass Fe40Ni40P14B6

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Abstract
Measurements of torsional stress as a function of strain were carried out in as-quenched and cold-rolled amorphous ribbons of Metglass 2826, at room temperature and 77K. These samples show a giant reversible, but nonlinear, region of about 60 pi rad m-1. The observed behaviour seems to be a consequence of a freezing-in plastic flow mechanism, for room and lower temperatures, which increases the reversible region beyond the linear limit, and therefore higher order products of strains in the free energy development are needed.

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