Abstract
USING an improved X-ray technique, Preston1 and Guinier2 have shown that when aluminium-copper single crystals containing 4 per cent copper are aged at low temperatures, thin plates of copper-rich atoms are formed on (100) planes of the crystal. Swindells and Sykes3 found, from specific heat measurements on a similar alloy, that when specimens previously aged at low temperatures were re-heated, heat was absorbed before the chemical energy of precipitation was liberated. They suggested that this energy absorption was due to the dispersion of the copper-rich plates formed during the low-temperature ageing, an interpretation which was confirmed by Preston.
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References
Preston, Proc. Phys. Soc., 52, 77 (1940).
Guinier, C.R., 206, 1972 (1938).
Swindells and Sykes, Proc. Roy. Soc., A, 163, 237 (1939).
Barrett and Geisler, J. App. Phys., 11, 733 (1940).
Sykes and Jones, J. Inst. Met., 59, 257 (1936).
Mehl and Jetter, Amer. Soc. Metals, Preprint No. 30 (1939).
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JONES, F., LEECH, P. Pre-Precipitation Phenomena in Age-Hardening Alloys. Nature 147, 327–328 (1941). https://doi.org/10.1038/147327b0
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DOI: https://doi.org/10.1038/147327b0
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