Characterization of Silicide Precipitates in Primary Nb Phase in Nb-10% Si In-Situ Composites

摘要

This paper deals with the identification and characterization of the precipitatesin the primary Nb phase in Nb-10 (atomic) percent Si alloy. It was observed that; the precipitates in the primary Nb dendrites of Nb-10 at. % Si have been identified as Nb3Si. A definite orientation relationship exists between the Nb3Si precipitates and the Nb matrix and, based on volume fraction measurements of the Nb3Si, the maximum solubility of Si in Nb is at least 4.36 at. %, consistent with the ASM phase diagram.