Influence of Dislocation Pile-Up on Main Crack Propagation in Nanocrystals in the Hydrogen Environment

IF 2 3区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Mechanica Solida Sinica Pub Date : 2023-07-31 DOI:10.1007/s10338-023-00417-9

Jiding Zhang, Yue Sheng, Hongda Yang, Jinbo Wu, Xiaoyu Jiang

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Abstract

The influence of material micro-defects on the main crack growth under pure shear loading is studied theoretically. The mechanism behind the initiation of micro-cracks and crack propagation induced by dislocation accumulation near the grain boundary (GB) is mainly considered, and the influence of dislocation accumulation on the main crack propagation is analyzed. The research results reveal that the initiation of micro-cracks near the GB is prior to the propagation of the main crack. In a hydrogen environment, hydrogen can cause serious embrittlement of the crack tip and promote crack growth. The energy release rate in the main crack growth direction in the dislocation emission direction is the highest. Therefore, the main crack will eventually merge with the micro-cracks at the GB along the direction of the slip band, resulting in fracture of the crystal material. The research presented in this paper provides some new information for the first stage of crack propagation and contributes to the analysis of the mechanism of crystal metal fracture.

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位错堆积对氢环境下纳米晶主裂纹扩展的影响

从理论上研究了纯剪切载荷下材料微缺陷对主裂纹扩展的影响。重点研究了晶界附近位错积累诱发微裂纹萌生和裂纹扩展的机理，分析了位错积累对主裂纹扩展的影响。研究结果表明:微裂纹的萌生早于主裂纹的扩展;在氢环境中，氢会引起裂纹尖端的严重脆化，促进裂纹扩展。在位错发射方向上，主裂纹扩展方向的能量释放率最高。因此，主裂纹最终会沿滑移带方向与GB处的微裂纹合并，导致晶体材料断裂。本文的研究为裂纹扩展的第一阶段提供了一些新的信息，有助于分析金属晶体断裂的机理。

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来源期刊

Acta Mechanica Solida Sinica 物理-材料科学：综合

CiteScore

3.80

自引率

9.10%

发文量

1088

审稿时长

9 months

期刊介绍： Acta Mechanica Solida Sinica aims to become the best journal of solid mechanics in China and a worldwide well-known one in the field of mechanics, by providing original, perspective and even breakthrough theories and methods for the research on solid mechanics. The Journal is devoted to the publication of research papers in English in all fields of solid-state mechanics and its related disciplines in science, technology and engineering, with a balanced coverage on analytical, experimental, numerical and applied investigations. Articles, Short Communications, Discussions on previously published papers, and invitation-based Reviews are published bimonthly. The maximum length of an article is 30 pages, including equations, figures and tables