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首页> 外文期刊>International Journal of Plasticity >Effects of Ag and Zr solutes on dislocation emission from Sigma 11(332) [110] symmetric tilt grain boundaries in Cu: Bigger is not always better
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Effects of Ag and Zr solutes on dislocation emission from Sigma 11(332) [110] symmetric tilt grain boundaries in Cu: Bigger is not always better

机译：Ag和Zr溶解对Sigma 11（332）的脱位排放的影响[110] Cu中对称倾斜晶界的影响：更大并不总是更好

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摘要

Solute additions are commonly used to stabilize nanocrystalline materials against grain growth, and can simultaneously enhance the strength of the material by impeding dislocation emission from the grain boundaries. In this study we demonstrate using molecular dynamics (MD) simulations that the effect of solutes on dislocation nucleation depends on the distribution of solutes at the grain boundary, and can vary dramatically depending on the solute type. Solutes with a smaller positive size mismatch to the host can be more effective in suppressing dislocation emission from grain boundaries than others that have larger mismatch. In particular, although Ag solutes have a smaller misfit with Cu than Zr solutes, the effect of Ag on the dislocation nucleation from grain boundaries in Cu can be larger than the corresponding effect of Zr. These findings are relevant to the search for optimal solute additions, which can strengthen a nanocrytalline material by suppressing the nucleation of dislocation slip from grain boundaries, while stabilizing it against grain growth.
机译：溶质添加剂通常用于稳定纳米晶体的谷物生长，并且可以通过阻碍晶界偏移排放来同时增强材料的强度。在这项研究中，我们使用分子动力学（MD）模拟，即溶质对位错成核的效果取决于晶界的溶质的分布，并且可以根据溶质型急剧变化。用较小的正尺寸与宿主失配的溶质可以更有效地抑制谷物边界的位错排放比其它更大的不匹配。特别地，尽管Ag溶质与Zr溶质的Cu具有较小的错量，但是Ag对来自Cu晶界的位移成核的作用可以大于Zr的相应效果。这些发现与寻求最佳溶质添加剂，其可以通过抑制晶界脱位速度的成核来增强纳米晶体材料，同时稳定谷物生长。

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