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arXiv 1912.09313cond-mat.mtrl-sci
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氢对纯铁塑性的影响--理论与实验

The influence of hydrogen on plasticity in pure iron-theory and experiment

Peng Gong, Ivaylo H. Katzarov, Anthony T. Paxton, W. Mark Rainforth

摘要:

拉伸应力松弛与透射电子显微镜相结合,揭示了溶解氢的影响,在纯α铁的位错结构和子结构的显着变化。我们发现,充氢试样经过塑性形变后,显示出一个非常典型的模式的拖尾偶极子和棱柱环,这是不带电的纯金属中所没有的。我们解释这些意见通过使用一个新的自洽的动力学蒙特卡罗模型,这实际上最初是用来预测现在观察到的微观结构。这一理论和实验相结合的研究结果是揭示氢增强局部塑性的基本机制。

英文摘要:

Tensile stress relaxation is combined with transmission electron microscopy to reveal dramatic changes in dislocation structure and sub structure in pure alpha iron as a result of the effects of dissolved hydrogen. We find that hydrogen charged specimens after plastic deformation display a very characteristic pattern of trailing dipoles and prismatic loops which are absent in uncharged pure metal. We explain these observations by use of a new self consistent kinetic Monte Carlo model, which in fact was initially used to predict the now observed microstructure. The results of this combined theory and experimental study is to shed light on the fundamental mechanism of hydrogen enhanced localised plasticity.

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