Transmission electron microscopy observations and micromechanical/continuum models for the effect of hydrogen on the mechanical behaviour of metals

Philosophical Magazine A Pub Date : 2002-11-01 DOI:10.1080/01418610208240451

P. Sofronis, I. Robertson

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引用次数: 82

Abstract

Abstract In-situ deformation studies in a transmission electron microscope equipped with an environmental cell have shown that solute hydrogen increases the velocity of dislocations, decreases the stacking-fault energy, and increases the stability of edge character dislocations. Theoretical modelling has established that the hydrogen atmospheres formed at dislocations through the elastic interaction cause a change in the stress field of the dislocation-hydrogen complex in such a manner as to reduce the interaction energy between it and other elastic obstacles. Consequently, solute hydrogen increases the mobility of dislocations, which will be localized to regions of high hydrogen concentration. On the basis of this material softening on the microscale, a solid mechanics analysis of the hydrogen solute interaction with material elastoplasticity demonstrates that localization of the deformation in the form of bands of intense shear can occur on the macroscale. Thus, the present combined experimental and numerical/analytical results provide a clear explanation for the hydrogen-enhanced localized plasticity mechanism of hydrogen embrittlement.

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氢对金属力学行为影响的透射电子显微镜观察和微力学/连续体模型

在环境电池的透射电子显微镜下进行的原位变形研究表明，溶质氢增加了位错的速度，降低了堆叠断层能量，增加了边缘特征位错的稳定性。理论建模表明，位错处通过弹性相互作用形成的氢气氛会引起位错-氢配合物应力场的变化，从而使位错-氢配合物与其他弹性障碍物的相互作用能降低。因此，溶质氢增加了位错的迁移率，位错将局限于高氢浓度的区域。基于这种材料在微观尺度上的软化，对溶质氢与材料弹塑性相互作用的固体力学分析表明，在宏观尺度上，变形可以以强剪切带的形式局部化。因此，本文结合实验和数值分析结果，为氢脆的氢增强局部塑性机理提供了清晰的解释。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Philosophical Magazine A

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