4.7 Article

The effects of composition and microstructure on compressive strength of Ag-Au nanoparticles

期刊

ACTA MATERIALIA
卷 261, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2023.119417

关键词

Nanoparticles; Solid solution; Dislocation; Hardening; Nanomechanics

向作者/读者索取更多资源

Hemispherical nanoparticles of Ag-33 at.% Au and Ag-60 at.% Au alloys were fabricated by solid state dewetting of Ag-Au bilayers on a sapphire substrate. In-situ microcompression tests and atomistic molecular dynamics simulations revealed the plastic deformation behavior and the absence of solid solution hardening effect in the alloys.
Hemispherical nanoparticles of Ag-33 at.% Au and Ag-60 at.% Au alloys were fabricated by solid state dewetting of Ag-Au bilayers deposited on a sapphire substrate. The in-situ microcompression tests of the particles in the scanning electron microscope have revealed the plastic deformation behavior typical of plasticity which is controlled by the nucleation of new dislocations: high elastic strain reaching about 5% of the particle diameter, followed by a catastrophic particle collapse. The modulus-normalized average contact pressure at the onset of plasticity calculated employing the isotropic Hertz model was concentration-independent for pure Ag and two studied alloys. The atomistic molecular dynamics simulations of shear and compressive deformation of bulk AgAu alloys revealed a weak solid solution hardening effect for dislocation nucleation stress and its absence for the nucleation strain. The particles strength and critical strain obtained in simulations were in excellent quantitative agreement with the experimental results. The lack of solid solution hardening or weakening effects in the Ag-Au has been discussed in terms of small atomic size mismatch between Ag and Au. Finally, the effect of the twin boundaries observed in the Ag-Au particles on their strength was discussed.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据