Density of FeB- and CoB-Based Alloys
in Amorphous and Crystalline States

M. R. Filonov, O. A. Abdul-Fattakh, and M. G. Taranov

Moscow Institute of Steel and Alloys, Leninskii pr. 4, Moscow, 117936 Russia

Received May 17, 1996; in final form, December 15, 1996

Abstract—Density of glass-forming Fe–B- and Co–B-based alloys in amorphous and crystalline states was
studied in a temperature range of 20–900°C. The temperature dependences for the amorphous and crystalline
samples were calculated from the results of dilatometry. The room-temperature density was determined by
hydrostatic weighing. It was found that, after crystallization, the ribbons transform to a stable non-equilibrium
crystalline state with density that is lower than that of the corresponding as-cast bulk alloys. Transition to the
state with the equilibrium value of density is completed upon annealing at temperatures close to solidus tem-
peratures.

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