Phase equilibria in the Co-rich Co-Al-W-Ti quaternary system

► The g/g' microstructures were recently found to form in the Co-Al-W ternary system. ► We found previously that the g' phase is thermodynamically metastable at 900 °C. ► We investigated in this paper phase equilibria in the Co-rich Co-Al-W-Ti system. ► We found that stable g/g' microstructures can be formed in the quaternary system.