Interpreting hydrogen-induced fracture surfaces in terms of deformation processes: A new approach
Interpreting hydrogen-induced fracture surfaces in terms of deformation processes: A new approach
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DOI：
10.1016/j.actamat.2011.03.002
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发表时间：
2011-05-01
期刊：
影响因子：
9.4
通讯作者：
Sofronis, P.
中科院分区：
文献类型：
--
作者：
Martin, M. L.;Robertson, I. M.;Sofronis, P.
传统上，根据潜在变形过程来解释断裂面上的拓扑特征是基于对过程和机制的假设知识，而没有建立直接的相关性。通过高分辨率扫描电子显微镜（SEM）、原子力显微镜和聚焦离子束加工的结合，可以通过透射电子显微镜对表面下的微观结构进行研究，从而可以将发育的结构与断口的拓扑结构相关联。使用这种方法，在低分辨率扫描电镜下显示平坦的氢致裂缝表面的特征显示出与潜在的密集位错排列相关的细尺度波动。从氢脆模型的角度讨论了这种微观组织的形成和断口表面，得出的结论是，表面的形成可以在氢脆增强塑性模型的框架内理解，建立了有利于形成所观察到的表面特征的条件。(C) 2011材料学报Elsevier Ltd.出版。版权所有。
Interpreting topological features on fracture surfaces in terms of the underlying deformation processes has traditionally been based on assumed knowledge of the processes and mechanisms with no direct correlation being established. By using a combination of high-resolution scanning electron microscopy (SEM), atomic force microscopy and focused-ion beam machining to enable investigation by transmission electron microscopy of the microstructure immediately beneath the surface, correlation of developed structure with the topology of the fracture surface becomes possible. Using this methodology, features on hydrogen-induced fracture surfaces that appear flat at low resolution under SEM are revealed to be decorated with fine-scale undulations that are associated with an underlying dense arrangement of dislocations. The formation of this microstructure and the fracture surface are discussed in terms of hydrogen embrittlement models, with the conclusion reached that the surface formation can be understood within the framework of the enhanced plasticity model of hydrogen embrittlement establishing the conditions that favor the formation of the observed surface features. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.