Development of the γ′ Stability in Co–Al–W Alloys at 800 °C by Alloying with Carbon

The microstructures and hardnesses of Co–10Al–9W–1C, Co–7Al–5W–1C, and Co–7Al–5W (at. pct) alloys are reported. Homogenization of the Co–10Al–9W–1C alloy was unsuccessful at 1300 °C and both B2–CoAl and η carbide phases remained in the interdendritic regions. However, the lower-solute Co–7Al–5W–1C a...

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