Hydrogen suppression of dislocation cell formation in micro and nano indentation of pure iron single crystals

Hydrogen suppression of dislocation cell formation in micro and nano indentation of pure iron single crystals
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纯铁单晶微纳米压痕中氢对位错胞形成的抑制

DOI:
10.1016/j.scriptamat.2020.113683
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发表时间:
2021
期刊:
影响因子:
6
通讯作者:
Gong P
Gong P
中科院分区:
材料科学1区
文献类型:
--
作者:
Gong P

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利用电子背散射衍射(EBSD)和透射电子显微镜(TEM)分析了氢对纯铁单晶垂直于(100)面微纳压痕位错迁移率的影响,并采用自洽动力学蒙特-卡罗(SCkMC)方法进行了模拟。无氢样品的纳米压痕载荷曲线有两个主要的恒定载荷弹出,和多个较小的弹出,而充氢材料只有一个弹出,但具有较长的加载释放。在无氢条件下,在压头下观察到一个定义明确的胞状结构,但位错均匀分布在充氢样品中。SCkMC模拟结果表明,在本加载条件下,充氢后位错较无氢时难以从主滑移面滑移出来。
The influence of hydrogen on dislocation mobility in pure single crystal iron subjected to micro- and nanoindentation testing perpendicular to the (100) plane has been analysed using electron back-scattered diffraction (EBSD) and transmission electron microscopy (TEM) and simulated using the self-consistent kinetic Monte-Carlo (SCkMC) method. The nanoindentation load curve for the hydrogen free sample has two major constant load pop-ins, and multiple smaller pop-ins, whereas the hydrogen charged material has only one pop-in but with a longer loading release. A well-defined cell structure was observed below the indenter in the hydrogen free condition, but the dislocations were homogenously distributed in the hydrogen charged sample. The SCkMC simulations showed that it is difficult for dislocations to glide out of the primary slip plane after hydrogen charging compared with the hydrogen free sample under the present loading conditions.
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