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The strongest size

机译：最强的尺寸

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摘要

The well known break-down of the Hall-Petch effect of the rise of the plastic resistance with decreasing grain size in polycrystalline metals, when the grain size drops into the nanometre range resulting in a peak plastic resistance at a grain size of about 12-15 nm, is explained by considering two alternative and complementary rate mechanisms of plasticity, grain boundary shear and dislocation plasticity, each contributing to the overall strain rate in proportion to the volume fraction of the material in which they operate. In the model for a given applied strain rate it is shown that the plastic resistance reaches a maximum ' at a grain size of about 12.2 nm in Cu when the two mechanisms contribute to the overall strain rate equally, defining the so-called strongest size.
机译：众所周知，当多晶金属的粒径下降到纳米范围内时，塑性电阻的增加会随着塑性电阻的增加而产生的霍尔-帕奇（Hall-Petch）分解，导致粒径在约12-通过考虑塑性，晶界剪切和位错塑性这两种替代和互补的速率机理来解释15 nm，每种机理都与它们所使用的材料的体积分数成比例地有助于总应变速率。在给定的施加应变率的模型中，当两种机制均等地影响总应变率时，塑性电阻在Cu的晶粒尺寸约为12.2 nm时达到最大值，即所谓的最大强度。

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