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In this study the Fe 43.2 Co 28.8 B 19.2 Si 4.8 Nb 4  (at.%) alloy was processed by spray forming in an industrial facility with the aim of investigating the formation of amorphous phases. The thicker layers (5–15 mm) presented partial/fully crystalline microstructure with onset of crystallization of the amorphous phase at  T   x   = 595 °C. On the other hand, thinner layers (below 2.5 mm) presented fully amorphous structure, and glassy behaviour with glass transition ( T   g  ) at 555 °C. The thermal stability and the crystallization kinetics of the alloy were studied using the isothermal DSC curves, measured at different heating rates and temperatures. Despite its good glass-forming ability (GFA) and high stability against crystallizations, its incubation time for crystallization is almost zero. In order to rule-out the complete crystallization mechanism, in situ temperature resolved studies using TEM were done. In addition, the amorphous part of the deposit was heat treated at various temperatures/times and the results were compared with the in situ crystallization behavior observed by TEM.

htm journal of heat treatment and materials

Microstructure Characterization and Kinetics of Crystallization Behavior of Tubular Spray Formed Fe 43.2 Co 28.8 B 19.2 Si 4.8 Nb 4  Bulk Metallic Glass *