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Updated: May 2, 2026

Determining the Mechanical Strength of Ultra-Fine-Grained Metals
Published on: November 22, 2021
Near-surface strain in icosahedra of binary metallic alloys: segregational versus intrinsic effects
Darius Pohl1, Ulrich Wiesenhütter, Elias Mohn
1Institute for Metallic Materials, Leibniz Institute for Solid State and Materials Research (IFW) Dresden , P.O. Box 270116, D-01171 Dresden, Germany.
Abstract:
A systematic structural analysis of FePt, CuAu, and Au icosahedral nanoparticles is presented. The uncovered particles are prepared by inert gas condensation and thermally equilibrated through in-flight optical annealing. Aberration-corrected high-resolution transmission electron microscopy reveals that the crystal lattice is significantly expanded near the particle surface. These experimental findings are corroborated by molecular statics simulations that show that this near-surface strain originates from both intrinsic strain due to the icosahedral structure and a partial segregation of the larger of the two alloy constituents to the particle surface.
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