Decomposition of the γ solid solution in a nickel-based cast alloy at a high uniform pressure

Synchrotron X-ray diffraction analysis of a cast nickel alloy after barothermal action

“…This approach is thought to be possible if we take into account a dendritic structure of the alloy, which contains dendrite arms and interdendritic space. In the as cast alloy, we clearly detected γ' phase particles in dendrite arms and the interdendritic space [6]. We suppose that the regular cuboid morphology of γ' phase particles corresponds to less equilibrium solidification conditions of a γ solid solution and that γ' precipitates with a "broken" spherical shape appear during the decomposition of the solid solution under more equilibrium solidification conditions, at small supercoolings before the melt/crystal interface char acteristic of the solidification of the interdendritic space.…”

“…Many modern works [1][2][3][4][5][6][7] inves tigate the effect of barothermal treatment (BTT) on the formation of the γ' phase and the evolution of the morphology and chemical composition of carbides and the crystal structure of high temperature alloys due to dynamic development of hot isostatic pressing (HIP) of nickel superalloys. These works analyze a change in the morphology of γ' particles [1,6,7] and the morphology and composition of carbides [5] in nickel superalloys. The crystal structures of these alloys were studied by X ray diffraction (XRD) [2,3].…”