The influence of Carbon addition on a ternary Co-Al-W alloy is investigated especially regarding phase stability and partitioning behavior of alloying elements. During casting and subsequent cooling, C-additon leads to the formation of an interdendritic carbide network and to the homogeneous precipitation of cuboidal E2 1 phase, Co 3 AlC, in the W-rich Co matrix. The solvus temperature of this phase is found to be about 1200°C, which is significantly higher than the solvus temperature of the ternary L12 phase Co 3 (Al,W). In the course of solution heat treatment, the Co 3 AlC precipitates are dissolved and the carbides change in morphology and chemical composition. Further annealing leads to the precipitation of small cuboidal precipitates of L1 2 phase, Co 3 (Al,W), and to a discontinuous precipitation of further phases.
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