Abstract
MOST metals other than those having a face-centred cubic structure show a more or less rapid transition from ductile to brittle behaviour as the temperature is lowered. Well above the transition temperature the fracture surfaces are mainly fibrous with only a few cleavage facets, but at intermediate temperatures fracture occurs by cleavage after a strain of a few per cent. So far little attention has been paid to the mechanism of this ductile cleavage fracture. Recently, we have examined cleavage facets and longitudinal sections of a number of fractured specimens in which cleavage occurred after straining about 10 per cent at room temperature at a rate of strain of 0.88 × 10−4 sec.−1. The tensile specimens, which had grain diameters of about 2 mm., were prepared from arc-cast deoxidized molybdenum and were 0.1 in. in diameter1. The results throw some light on the mechanism of fracture.
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References
Johnson, A. A., Phil. Mag., 4, 194 (1959).
Low, J. R., Madrid Colloquium on Deformation and Flow of Solids (Springer-Verlag, 1956).
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JOHNSON, A., SHAW, B. Ductile Cleavage Fracture of Molybdenum. Nature 183, 1542–1543 (1959). https://doi.org/10.1038/1831542b0
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DOI: https://doi.org/10.1038/1831542b0
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