The effect of composition and long-range order on the strength of defect-free faceted Cu-Au nanoparticles

Liang, Zhao; Rabkin, Eugen

doi:10.1016/j.actamat.2024.119680

Cited by 2 publications

(1 citation statement)

References 65 publications

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“…However, it has been considered that FIB usually produces a surface damage layer with a thickness of 10–20 nm, which complicates the mechanism understanding . It was observed that much higher yield strength can be achieved in smooth spherical nanoparticles because the passivated smooth surface is expected to reduce the possibility of surface dislocation nucleation. − Recently, by applying the solid-state dewetting method and carefully controlling the defects in metal micro/nanoparticles, evidence of source-controlled plasticity with a theoretical strength limit is provided . Besides, it was also found that both strength and deformation behavior are significantly dependent on the crystal orientation of nanoparticles …”

Section: Introductionmentioning

confidence: 99%

Weak Size-Dependent Strength and Extreme Plastic Deformation of Single Crystal Cu Microparticles

Lu,

Pan,

Fang

et al. 2024

J. Phys. Chem. C

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Single crystal Cu microparticles with varied sizes and good crystallinity were batch-fabricated by a flash arc synthesis (FAS) method. The size and extreme plastic deformation-dependent mechanical behaviors of Cu microparticles were investigated through in situ mechanical tests under scanning electron microscopy (SEM). It is noted that the Cu microparticles exhibit near theoretical strength at much larger sizes by comparison with reported values, accompanied by the weak size effect on strength, which we attribute to the high quality of the prepared Cu microparticles. Besides, the hardness of precompressed Cu microparticles increases sharply with the increase of the residual strain, which we attribute to the obstruction of dislocation movement by the drastically increased contact interfaces during extreme plastic deformation and the high hydrostatic pressure induced by friction at the contact interfaces. Then, an extended Taylor hardening model is developed to quantify the residual strain-dependent hardness.

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