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Effect of surface imperfections on the ductility of pure chromium

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Abstract

The fracture behaviour of high-purity polycrystalline chromium was investigated using bend tests at room temperature in air. It was found that plasticity was dependent largely on surface imperfections. For example, brittle fracture took place in a roughly polished specimen containing a large number of small cracks on the surface. However, once the specimen was polished finely or electropolished, it was able to be bent by more than 90‡ without showing any brittle fracture. Such a surface effect on the fracture mode is very similar to the observations in glasses and in alkali halide crystals (for example, NaCl and LiF).

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Authors and Affiliations

  1. Department of Production Systems Engineering, Toyohashi University of Technology, Toyohashi, 441, Aichi, Japan

    M. Morinaga, T. Nambu & J. Fukumori

  2. Chemical Laboratories, Tosoh Corporation Ltd, 4560 Kaisei-cho, ShinNanyo-shi, 746, Yamaguchi, Japan

    M. Kato & T. Sakaki

  3. Oita National College of Technology, 1666 Oaza-maki, Oita-shi, 870-01, Oita, Japan

    Y. Matsumoto

  4. Mechanical Engineering Laboratory, Agency of Industrial Science and Technology, 1-2 Namiki, Tsukuba, 305, Ibaraki, Japan

    Y. Torisaka & M. Horihata

Authors
  1. M. Morinaga
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  2. T. Nambu
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  3. J. Fukumori
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  4. M. Kato
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  5. T. Sakaki
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  6. Y. Matsumoto
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  7. Y. Torisaka
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  8. M. Horihata
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Morinaga, M., Nambu, T., Fukumori, J. et al. Effect of surface imperfections on the ductility of pure chromium. J Mater Sci 30, 1105–1110 (1995). https://doi.org/10.1007/BF01178452

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  • DOI: https://doi.org/10.1007/BF01178452

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