SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 37: Topical Session: Defect Phases II

MM 37.5: Topical Talk

Donnerstag, 30. März 2023, 11:45–12:15, SCH A 216

Density-based Grain Boundary Phase Diagrams — •Reza Darvishi Kamachali — Federal Institute for Materials Research and Testing (BAM)

Phase diagrams are the roadmaps of material design yet primarily developed and discussed for defect-free bulk phases. Real microstructures, however, also contain large populations of defects, such as grain boundaries, which show their own distinct phase behavior. Recently, CALPHAD-integrated density-based phase diagrams were proposed for studying segregation and phase evolution in grain boundaries. In this method, the connection to available bulk thermodynamic data allows rapid assessment of grain boundary phase behavior. In this talk, density-based phase diagrams of several binary and ternary alloy systems will be discussed, with direct implications for alloy and microstructure design. The significance and integration of elastic energies to the density-based model will be presented. It will be shown that Cu segregation and segregation transition in Al-Cu and Al-Cu-Mg systems can be explained by the presence of solutes' elastic interactions with grain boundaries.