SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 41: Topical Session: Defect Phases III

MM 41.2: Vortrag

Donnerstag, 30. März 2023, 16:15–16:30, SCH A 216

Impact of precipitation on grain boundary diffusion in microstructure-engineered Ni-Cr-Fe alloy — •Baixue Bian, Mohan Muralikrishna Garlapati, Shabnam Taheriniya, Sandipan Sen, Gerhard Wilde, and Sergiy V. Divinski — Institute of Materials Physics, University of Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Gemany

Grain boundary structure-property relationship is studied in a Ni-based Inconel 602CA coarse-grained alloy using a novel correlative tracer diffusion-analytical microscopy approach. Homogenized and intermediate-annealed states are used to engineer the alloy microstructure. Grain boundary diffusion of Ni and Cr is measured in both C- and B-type kinetic regimes. A co-existence of several short-circuit contributions to tracer diffusion is distinguished and correlated to distinct grain boundary precipitation and segregation as revealed by HAADF-STEM combined with EDX measurements. The homogenized state reveals precipitation of Ni-based L12 and Cr23C6 phases which influence significantly diffusion properties. The intermediate annealing promotes a uniform formation of Cr carbides with a minimal/negligible fraction of the L12 phase. The present study demonstrates the correlated structure-kinetic property measurements provide a unique tool to probe the grain boundary precipitation in these industrially used Inconel alloys.