The influence of the angle ψ between the grain boundary plane and the precipitate habit plane on the morphology of θ′ in aluminium–copper alloys is specified from transmission electron microscopy of low angle tilt boundaries about 〈100〉. The precipitates are rectangular plates in the habit plane: their length, parallel to the tilt axis, and their width decrease markedly when the angle ψ increases. Thermodynamic considerations, taking the precipitate shape into account, explain some of the results of both the present and previous studies. It is concluded that intergranular precipitation kinetics are directly influenced by the angle between the grain boundary plane and the precipitate habit plane.
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References
1.
VAUGIIAND.: Acta Metall., 1968, 16, 563.
2.
LE COZEJ.: thesis, Paris VI, 1972.
3.
LE COZEJ., BISCONDIM., LEVYJ., and GOUXC.: Méni. Sci. Rev. Metall., 1973, 70, 397.
4.
SIMONJ. P. and GuvorP.: Ser. Metall., 1975, 9, 295.
5.
BUTLERE. P. and SWANNP.: Acta Metall., 1976, 24, 343.
6.
SIMONJ. P. and GUyOTP.: J. Mater. Sci., 1975, 10, 1947.
7.
LEVYJ. and GouxC.: C.R. Acad. Sci., Serie C, 1966, 263, 697.
8.
MICHAUTB.: thesis, Grenoble, 1971.
9.
TUK. N. and TURNBULLD.: Acta Metall., 1967, 15, 1317.
10.
TURNBULLD.: ‘Solid State Physics: Advances in Research and Applications’ (eds.SeitzF. and TurnbullD.), Vol. III, 256–262. 1956: New York(Academic Press Inc.).
11.
SILCOCKJ. M., HEALT. J., and HARDYH. K.: J. Inst. Met., 1954, 82, 239.
12.
AARONSONH. I., CLARKJ. B., and LAIRDC.: Met. Sci. J., 1968,2, 155.
13.
TAYLORJ. W.: J. Inst. Met., 1957 –58, 86, 456.
14.
HASSONG.: thesis, Paris VI, 1972.
15.
HASSONG. and GouxC.: Ser. Metall., 1971, 5, 889.
16.
READw. T. and SHOCKLEYw.: Ph vs. Rev., 1950, 78, 275.
17.
AARONH. B. and BOLLINGG. F.: Surf Sci., 1972, 31, 27.
18.
WEATHERLYG. C. and NICHOLSONR. B.: Philos. Mag., 1968, 17, 801.
