Abstract

Anomalies (minima of σ fp) are discovered in composition dependencies of the critical stress σ fp for catastrophic shear of the Fe 100− x B x , Fe 80− x Ni x B 20 and Fe 85− x Co x B 15 amorphous alloys. These minima correspond to the eutectic ( x=17) in the Fe–B system, to x=40 in the Fe–Ni–B system and to x=40 and 21 in the Fe–Co–B system. Considering mobile dislocations in amorphous alloys located at boundaries between nanoclusters makes it possible to explain and to predict anomalous (non-monotonous) composition dependencies of mechanical properties of amorphous alloys.

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