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首页> 外文期刊>Materials Science and Engineering >Dislocation versus grain boundary strengthening in SPD processed metals: Non-causal relation between grain size and strength of deformed polycrystals
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Dislocation versus grain boundary strengthening in SPD processed metals: Non-causal relation between grain size and strength of deformed polycrystals

机译：SPD加工金属中的位错与晶界强化：晶粒尺寸与变形多晶强度之间的非因果关系

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摘要

In metals that are heavily cold deformed, for instance by a severe plastic deformation process, significant strengthening is caused by the high density of defects such as grain boundaries and dislocations. In this work a model for volume-averaged dislocation and grain boundary (GB) creation is used to show that unless significant annihilation of defects post deformation occurs, the dislocation densities and GB densities in the deformed material are closely correlated. The dislocation strengthening effect thus shows a strong correlation with GB strengthening, and correlation of strength or hardness with d~(-1/2), where d is the grain size, as in a Hall-Petch type plot, can not be taken as an indication that GB strengthening dominates. Instead, in many SPD processed metals and alloys, dislocation strengthening is the dominant strengthening effect, even though a Hall-Petch type plot shows a good linear correlation.
机译：在严重冷变形的金属中，例如通过严重的塑性变形过程，由于缺陷的高密度（例如晶界和位错）而导致明显的强化。在这项工作中，使用了体积平均位错和晶界（GB）创建模型来表明，除非发生变形后缺陷大量消失，否则变形材料中的位错密度和GB密度紧密相关。因此，位错强化效果显示出与GB强化之间的强相关性，而强度或硬度与d〜（-1/2）的相关性（如Hall-Petch型图所示，其中d为晶粒尺寸）不能视为表明GB加强起主导作用。相反，在许多经SPD处理的金属和合金中，位错强化是主要的强化效果，即使Hall-Petch型图显示出良好的线性相关性。

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