Abstract
Multiphase alloys of the Me–B–Si (Me=refractory metal) systems have been considered for structural applications at high temperatures. In this work, the solidification pathway and phase stability of Nb-rich Nb–B–Si alloys were evaluated from arc-melted and heat-treated samples. The primary phases observed in the region of study were Nb ss, T 2-phase and D8 8-phase. The as-cast microstructure of all the alloys indicates formation of an Nb ss+T 2 eutectic in the last part to solidify. From the heat treatment of several alloys, the Nb ss−T 2 two-phase field was observed to exist at 1700 °C. Based on DTA experiments, the Nb ss−T 2 two-phase field should be stable up to 2150 °C.
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