Distribution of Alloying Elements over the Phase Constituents in Nb–Si in situ Composites

Аннотация

The distribution of alloying elements over the phases in a eutectic Nb–Nb₅Si₃ composite material during directional solidification is studied. The influence of substitutional alloying elements on the type of structure in the reinforcing phase of silicide is analyzed. The crystal structures of the hexagonal and tetragonal modifications of the Nb₅Si₃ silicide are characterized and compared. The dependence of the creep resistance on the type of silicide structure is explained.