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Meeting 2027 TMS Annual Meeting & Exhibition
Symposium Chemistry and Physics of Interfaces
Presentation Title Co diffusion in Cu nearly Σ 5 (310)[001] bicrystal: Structure modifications revealed by combined radiotracer diffusion and microscopy analyses
Author(s) Neelamegan Esakkiraja, Hui Ding, Anoosheh Akbari, Harald Rösner, Gerhard Wilde, Christian Liebscher, Sergii V. Divinskyi
On-Site Speaker (Planned) Sergii V. Divinskyi
Abstract Scope Diffusion of Co in pure copper Σ 5(310)[001] bicrystals is investigated using the radiotracer technique and applying the 57Co radioisotope. Anomalous penetration profiles, which deviate strongly from the exact solutions for a position-independent grain boundary diffusion rate, are related to the Co segregation-induced changes of the grain boundary structure. High-resolution electron microscopy measurements were performed on (natural) Co-diffused samples mimicking the radiotracer experiments with 57Co. Characteristic changes of grain boundary atomistic motives and an appearance of specific grain boundary phases (complexions) demarcated by linear-type grain boundary defects were documented. The GB linear-type defects are considered to be responsible for the transient enhancement of the Co grain boundary diffusion rates and the appearance of the abnormal penetration profiles. Nano-beam diffraction is used to record the Co diffusion-induced evolution of elastic strains in the grain boundary vicinity with a nanometer resolution.
Proceedings Inclusion? Planned:
Keywords Characterization, Thin Films and Interfaces, Other

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