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MM: Fachverband Metall- und Materialphysik

MM 12: Poster I

MM 12.4: Poster

Monday, March 27, 2023, 18:15–20:00, P2/OG1+2

Structural evolution and atomic transport in severely deformed bi-metallic samples — •Shraddha V. Sevlikar, Gerhard Wilde, and Sergiy V. Divinskiy — Westfälische Wilhelms-Universität Münster, Institut für Materialphysik, Münster, Germany

Mechanical mixing, deformation-induced transport, and chemically-driven diffusion in layered bi-metallic Ni/Cr, Ni/Cu, Cu/Ag, and Cu/Au systems are investigated using scanning- and transmission electron microscopy, electron probe microanalysis and secondary ion mass spectroscopy. Alternatively, stacked Ni/Cr, Ni/Cu, Cu/Ag, and Cu/Au layers were subjected to room temperature high pressure torsion (HPT) using 10 and more revolutions. Atomic mixing is observed and discussed in terms of a high dislocation density, high concentration of non-equilibrium vacancies, and an impact of grain boundaries. The role of creep deformation is addressed by performing shear compression tests at selected temperatures on specially designed Ni or Cu samples with layers of Cr/Cu or Ag/Au deposited on the gauge sections. Mechanical mixing-induced recrystallization in the Cu-Au and Cu-Ag systems is observed and is discussed.