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MM: Fachverband Metall- und Materialphysik

MM 33: Transport in Materials: Diffusion, Conduction of Charge or Heat III

MM 33.3: Talk

Wednesday, March 20, 2024, 10:45–11:00, C 264

Interdiffusion in Cu-Ni couples with end-members severely plastically deformed via high-pressure torsion — •Esakkiraja Neelamegan¹, Jasper Berndt², Stephan Klemme², Gerhard Wilde¹, Aloke Paul³, and Sergiy. V Divinski¹ — ¹Institute of Materials Physics, University of Münster, Münster-48149 Germany — ²Institute for Mineralogy, University of Münster, Münster-48149 Germany — ³Department of Materials Engineering, Indian Institute of Science, Bangalore-560012 India

For coarse-grained polycrystalline alloys, interdiffusion of the Cu-Ni system is investigated, and the composition-dependent interdiffusion coefficients are known to decrease with an increase in the Ni concentration. The present study explores the influence of the end members' microstructure state on the interdiffusion behaviour. Severe plastic deformation via high-pressure torsion is used. We estimate the composition-dependent tracer diffusion coefficients using the augmented tracer-interdiffusion couple approach. The interdiffusion behaviour of undeformed (coarse-grained) and deformed (ultra-fine-grained) materials are compared. An anomalous diffusion behaviour with respect to the annealing temperature is observed. The comprehensive tracer and interdiffusion data shed light on the impact of plastic deformation on the interdiffusion behaviour.

Keywords: Interdiffusion; Severe Plastic Deformation; Cu-Ni