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Abstract

Ni-base superalloys are widely used materials for turbine blades in gas turbines in aerospace and power industries. These alloys have very high mechanical strength and creep resistance at high temperatures which allows using of such material at temperatures up to 1370 K. Such excellent mechanical properties of Ni-base superalloys are due to the special cuboidal microstructure which is formed by the γ and γ' phases, where a harder γ' (FCC, ordered) phase particles are embedded into a more ductile γ (FCC, disordered) phase matrix, where hard γ' particles prevent long distance dislocations glide ensuring high mechanical strength. In order to address the formation of γ-γ' microstructures in Ni-base superalloys we performed a large scale three-dimensional phase field simulation of γ'-phase precipitation and coarsening in Ni-Al. Our simulations are based on the multi-phase field model implemented in the open source phase field simulation library OpenPhase. The coarsening kinetics of γ' precipitates will be discussed.