Abstract
IRON containing small amounts of carbon and nitrogen exhibits a peculiar relationship between stress and strain which appears in different forms at different temperatures; it shows the yield phenomenon at room temperature, blue brittleness at temperatures in the range 200–400° C., and twinning at the temperature of liquid air. The part played by the carbon and nitrogen in the yield phenomenon has been explained by a recent theory1–3 according to which certain foreign atoms in the metal collect preferentially at dislocations. Blue brittleness occurs when the temperature and strain-rate are such that strain ageing can occur during the time needed for a Lüders band to travel along the specimen. This causes repeated yielding to take place.
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CHURCHMAN, A., COTTRELL, A. Yield Phenomenon and Twinning in α-Iron. Nature 167, 943–945 (1951). https://doi.org/10.1038/167943b0
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DOI: https://doi.org/10.1038/167943b0
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