Ultimate compressive strength and severe plastic deformation of equilibrated single-crystalline copper nanoparticles

Liang, Zhao; Magar, Nishchal Thapa; Koju, Raj Kiran; Chesser, Ian; Zimmerman, Jonathan; Mishin, Yuri; Rabkin, Eugen

doi:10.1016/j.actamat.2024.120101

Title: Ultimate compressive strength and severe plastic deformation of equilibrated single-crystalline copper nanoparticles

Journal Article · 14 September 2024 · Acta Materialia

DOI: https://doi.org/10.1016/j.actamat.2024.120101 · OSTI ID:2426814

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Technion-Israel Institute of Technology, Haifa (Israel)
George Mason Univ., Fairfax, VA (United States)
George Mason Univ., Fairfax, VA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Mechanical properties and deformation mechanisms of defect-free copper nanoparticles are investigated by combining experiments with atomistic simulations. The compressive strength of the particles increases with decreasing size and tends to saturate near the theoretical strength in the small-size limit. In this limit, the intrinsic size dependence of the strength is governed by the stochastic nature of dislocation nucleation near the particle surface. The particle deformation process evolves from the initial strain softening to strain hardening as the particle accumulates residual damage. The normalized strength-size relation for Cu is compared with those for Au, Ni, and Pt. The lack of universal behavior among the four FCC metals is discussed. Heavily deformed Cu nanoparticles develop polycrystalline structures and change the lattice orientation from [111] to [110]. The experiments and simulations reveal the twinning mechanism of the lattice rotation leading to the new grain formation.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 2426814

Report Number(s):: LA-UR--24-20158

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 276; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Ultimate compressive strength and severe plastic deformation of equilibrated single-crystalline copper nanoparticles

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