Regensburg 2025 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 13: Topical Session: Defects of Defects

MM 13.1: Topical Talk

Dienstag, 18. März 2025, 14:00–14:30, H10

Dynamics of dislocations and grain boundaries during recrystallization of metal nanoparticles — •Eugen Rabkin and Jonathan Zimmerman — Department of Materials Science and Engineering, Technion - Israel Institute of Technology, Haifa, Israel

Recrystallization of bulk metals plays a central role in materials processing, yet it has not been utilized so far for the synthesis of metal nanoparticles. In this work we describe the kinetics of recrystallization and related annealing phenomena in Pt nanoparticles. We uniaxially deformed the particles, annealed them both in-situ and ex-situ, and characterized their morphology and microstructure. Our findings reveal that new grains often nucleate within the parent particle, only to be rapidly reabsorbed back into it, with a strong correlation between this phenomenon and particle size. We propose a model that combines recrystallization and recovery through dislocation annihilation at the particle surface, predicting a critical size for recrystallization in nanoparticles. Finally, we propose a set of rules for nanoparticle recrystallization, mirroring the rules of recrystallization in bulk materials.

Keywords: Metal nanoparticles; Recrystallization; Grain boundaries; Dislocations