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Film Effects on Ductile/Brititle Behavior in Stress-Corrosion Cracking

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Abstract

The present work analyzes the effects of a passive film formed during stress corrosion cracking on ductile/brittle fracture behavior, considering the interaction of a screw dislocation with a thin film-covered mode III crack under an applied remote load. Exact solutions are derived, and the results show that the crack stress field due to the applied load is enhanced by a harder film or abated by a softer film. The critical stress intensity factor for dislocation emission from the crack tip is greatly influenced by both the stiffness and thickness of the film. A dislocation is more easily to be emitted from the crack tip if the covered film has a shear modulus larger than that of the substrate. The opposite is also true, i.e., a softer film makes dislocation emission more difficult. Both phenomena become more significant when the film thickness is smaller.

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Acknowledgments

The authors thank Mr. Cai-Fu Qian for his help in plotting the figures. Financial support from both the Hong Kong Research Grants Council through an RGC grant and the National Natural Science Foundation of China is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Center for Advanced Engineering Materials, Hong Kong University of Science and Technology, Kowloon, Hong Kong

    Tong-Yi Zhang

  2. Department of Materials Physics, Beijing University of Science and Technology, Beijing, 100083, China

    Wu-Yang Chu & Ji-Mei Xiao

Authors
  1. Tong-Yi Zhang
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  2. Wu-Yang Chu
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  3. Ji-Mei Xiao
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Zhang, TY., Chu, WY. & Xiao, JM. Film Effects on Ductile/Brititle Behavior in Stress-Corrosion Cracking. MRS Online Proceedings Library 409, 207–212 (1995). https://doi.org/10.1557/PROC-409-207

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  • DOI: https://doi.org/10.1557/PROC-409-207

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