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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Lubricant effect of copper nanoclusters on the dislocation core in α-Fe
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Lubricant effect of copper nanoclusters on the dislocation core in α-Fe

机译:铜纳米团簇对α-Fe位错核的润滑作用

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摘要

Ab initio based calculations reveal that Cu nanoclusters in α-Fe dramatically alter the core structure of a screw dislocation from nonpolarized in pure Fe to polarized. Complementary corroborative atomistic simulations using empirical interatomic potentials reveal that the Cu nanoprecipitate substantially enhances the edge component, which is in agreement with experiment. The core path under shear stress exhibits a stable → metastable → stable transition. In contrast, Cr clusters do not change the core polarization and increase the Peierls stress, thus hardening Fe. The origin in electronic structure of the Cu lubricant effect in facilitating the shear of atomic rows and the contrasting effects of Cu and Cr is elucidated.
机译:从头算的计算表明,α-Fe中的Cu纳米团簇可将螺丝位错的核心结构从纯铁中的非极化转变为极化。使用经验性原子间电势的补充确证原子模拟显示,Cu纳米沉淀物显着增强了边缘成分,这与实验相符。剪切应力作用下的岩心路径表现出一个稳定的→亚稳态→稳定的过渡。相反,Cr团簇不会改变铁芯极化并不会增加Peierls应力,从而使铁硬化。阐明了Cu润滑剂在电子结构中的起因,其促进了原子行的剪切以及Cu和Cr的对比作用。

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