Effect of surface imperfections on the ductility of pure chromium

The fracture behaviour of high-purity polycrystalline Cr 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 sma...

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Bibliographic Details
Published in:Journal of materials science 1995-02, Vol.30 (4), p.1105-1110
Main Authors: MORINAGA, M, NAMBU, T, FUKUMORI, J, KATO, M, SAKAKI, T, MATSUMOTO, Y, TORISAKA, Y, HORIHATA, M
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Fractures
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
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Summary:The fracture behaviour of high-purity polycrystalline Cr 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 > 90 deg 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 (e.g. NaCl and LiF).
ISSN:0022-2461
1573-4803
DOI:10.1007/BF01178452