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Cobalt-based alloys with {\gamma}/{\gamma}' microstructures have thepotential to become the next generation of superalloys, but alloy compositionsand processing steps must be optimized to improve coarsening, creep, andrafting behavior. While these behaviors are different than in nickel-basedsuperalloys, alloy development can be accelerated by understanding thethermodynamic factors influencing microstructure evolution. In this work, wedevelop a phase field model informed by first-principles density functionaltheory and experimental data to predict the equilibrium shapes of Co-Al-W{\gamma}' precipitates. Three-dimensional simulations of single and multipleprecipitates are performed to understand the effect of elastic and interfacialenergy on coarsened and rafted microstructures; the elastic energy is dependenton the elastic stiffnesses, misfit strain, precipitate size, applied stress,and precipitate spatial distribution. We observe characteristic microstructuresdependent on the type of applied stress that have the same {\gamma}' morphologyand orientation seen in experiments, indicating that the elastic stressesarising from coherent {\gamma}/{\gamma}' interfaces are important formorphological evolution during creep. The results also indicate that the narrow{\gamma} channels between {\gamma}' precipitates are energetically favored, andprovide an explanation for the experimentally observed directional coarseningthat occurs without any applied stress.

Predicting the morphologies of {\gamma}' precipitates in cobalt-based superalloys