Abstract
An analysis of the elastic rebound of thin ribbons of Fe 40Ni 40P 14B 6 bent into the mixed elastic-plastic regime shows that in the range 0 < ϵ p < ϵ f (where ϵ f is the plastic surface strain at failure (about 5% for unannealed material)) Fe 40Ni 40P 14B 6 behaves within an experimental uncertainty of ϖσ/ ϖϵ p < |2| as an ideal elastic-plastic solid. The flow stress appears to be preparation dependent and varies between 2.1 and 2.4 GPa for samples from the same manufacturer. Annealing at 150°C, i.e. at a temperature where structural relaxation commences, tends to decrease the batch-to-batch variation by increasing the flow stress towards a common value of about 2.5 GPa.
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