The effect of hydrogen on dislocation motion and cracking in tungsten foil

The effect of hydrogen on dislocation motion and cracking in tungsten foil
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氢对钨箔位错运动和裂纹的影响

DOI:
10.1016/j.corsci.2022.110547
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发表时间:
2022-08
期刊:
影响因子:
8.3
通讯作者:
Shuai Wang
Shuai Wang
中科院分区:
材料科学1区
文献类型:
--
作者:
Hailin Cao;Shuai Wang

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通过研究存在和不存在氢时微观结构特征的变化,我们研究了内部氢对钨箔裂纹尖端之前塑性变形的影响。微机械加载后,在充氢钨的裂纹尖端之前,我们发现了一个由位错缠结和 L 方形位错网络组成的间歇塑性区。 L方位错结构倾向于沿着裂纹扩展方向移动。这些观察结果归因于氢对能量释放速率和应力强度因子的影响。裂纹的扩展被认为是H修正位错运动和H引起的脱聚之间竞争的结果。 • 氢辅助裂纹扩展在钨箔中产生间歇塑性区和L 方位错结构。 • 在氢存在的情况下,L 方位错结构随裂纹前沿移动。 • 氢改性位错运动和氢诱导脱聚之间的竞争控制着钨箔中氢辅助开裂过程。
By investigating the change of microstructure features in the presence and absence of hydrogen, we studied the influence of internal hydrogen on the plastic deformation ahead of a crack tip in tungsten foil. After micromechanical loading, ahead of the crack tip in the hydrogen-charged tungsten, we found an intermittent plastic zone composed of dislocation tangles and a dislocation network with an L-square shape. The L-square dislocation structure tended to move along the crack propagation direction. These observations are attributed to the hydrogen effect on the energy release rate and the stress intensity factor. The propagation of crack is considered a result of the competition between H-modified dislocation motion and H-induced decohesion. • Hydrogen-assisted crack propagation generates intermittent plastic zones and L-square dislocation structures in tungsten foil. • The L-square dislocation configuration moves with the crack front in the presence of hydrogen. • Competition between hydrogen-modified dislocation motion and hydrogen-induced decohesion controls the hydrogen-assisted cracking process in tungsten foil.
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