Conditions of formation of “thick” plastic amorphous Fe-Co microwires in Fe75Si10B15-Co75Si10B15 system

Equilibrium and rapidly quenched Fe-Co-Si-B alloys are studied in Fe 75 Si 10 B 15 -Co 75 Si 10 B 15 cross section. The polythermal cross section is developed in the range of melting and crystallization temperatures. Amorphous ribbons of alloys are produced by melt spinning, and rapidly quenched microwires in a glass sleeve with diameter of the metal core d core = 10–100 μm are obtained by the Ulitovskii-Taylor technique. The structure and physical and mechanical properties of the alloys are studied. The concentration range of stability of “thick” amorphous plastic microwires with core diameter d core ≥ 50 μm is determined using analysis of the phase diagram and content-property diagram. A special two-stage crystallization mechanism responsible for high glass-forming ability of microwires is established.