The effect of stacking faults or twin formation on crack propagation in bcc iron

Authors: Guo, Ya-Fang¹; Wang, Chong-Yu²; Wang, Yue-Sheng¹

Source: Philosophical Magazine Letters, Volume 84, Number 12, December 2004 , pp. 763-770(8)

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Abstract:

Crack propagation in bcc iron at different strain rates and temperatures has been studied by atomistic simulation and continuum mechanics. The results show that stacking-fault creation, or twin formation and movement, are accompanied by crack extension in brittle fracture. Moreover, it is found, from the analysis of structure evolution, that the twinning process is reversible at low temperature, and is unstable with respect to the creation of new crack surfaces. We conclude that brittle fracture can be described as a competition between twin formation and new surface creation, and that stacking-fault creation or twin formation is favourable for fracture by cleavage.

Document Type: Research article

DOI: http://dx.doi.org/10.1080/09500830500061573

Affiliations: 1: Institute of Engineering Mechanics, Northern JiaoTong University, Beijing 100044, People's Republic of China 2: Tsinghua University, Beijing 100084, People's Republic of China

Publication date: 2004-12-01

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