Abstract
The phenomenon of thermal hardening was first observed by Orowan1 2 in single crystals of chemically pure zinc. He noticed that, sometimes, zinc crystals, after resting for 24–48 hours at room temperature, showed no trace of plastic deformation with applied stresses as much as 30 per cent above the previously determined critical yield stress. The crystal might remain for several minutes under such a high load without yielding; then extension would suddenly occur, and the yield stress fall, almost immediately, to the normal value originally observed.
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References
Orowan, E., Z. Phys., 89, 634 (1934).
Orowan, E., Proc. Phys. Soc., 52, 14 (1940).
Andrade, E. N. da C., and Roscoe, R., Proc. Phys. Soc., 49, 152 (1937).
Dehlinger, U., and Gisen, F., Phys. Z., 21, 862 (1934).
Taylor, G. I., Proc. Roy. Soc., A, 145, 362 (1934).
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SMITH, C. Thermal Hardening of Cadmium Crystals. Nature 160, 466–467 (1947). https://doi.org/10.1038/160466a0
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DOI: https://doi.org/10.1038/160466a0
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