Abstract
The structural changes during age hardening were investigated in a high purity aluminum alloy containing 6 pet Zn and 2 pet Mg by means of X-ray diffraction and dilatometry. It was found that when aging at low temperatures (up to 200°C) the precipitate which formed was MgZn2; above 300°C, (AlZn)49Mg32; at intermediate temperatures both phases formed. The precipitation at low temperatures started with the formation of Guinier-Preston zones in the (111) planes, followed by the formation of a transition lattice very similar to MgZn2 but with a = 4.96 and c = 8.68; this was replaced eventually by MgZn2. The dilatometric work confirmed the X-ray results; the length changes determined experimentally coincided with the changes calculated for the foregoing transformations.
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References
W. Fraenkel and R. Seng: Ztsch. für Metallkunde, 1920, vol. 12, p. 225.
W. Sanders and K. L. Meissner: Ztsch. für Metallkunde, 1924, vol. 16, p. 120.
P. J. Saldau and M. I. Zamatorin: Ztsch. Anorg-allgem. Chemie, 1933, vol. 213, p. 377.
A. A. Botchvar and V. G. Kuznetzov: Metallurg, 1933, vol. 2, p. 7.
L. N. Sergeev: Metallurg, 1937, vol. 3, p. 79.
P. Brenner and W. Feldmann: Aluminium, 1943, vol. 25, p. 38.
G. Chaudron, J. Herenguel, and P. Lacombe: Comptes Rendus, 1944, vol. 218, p. 404.
W. Bungardt and V. Hauk: Metallforschung, 1947, vol. 2, p. 161.
W. L. Fink and L. A. Willey: AIME Trans., 1937, vol. 124, p. 78.
G. Bergman, J. T. Waugh, and L. Pauling: Nature, 1952, vol. 169, p. 1057.
A. H. Geisler and J. K. Hill: Acta Crystallographica, 1948, vol. 1, p. 238.
L. W. McKeehan: Ztsch. für Kristallographie, 1935, vol. 91, p. 501.
G. C. Preston: Journal of Scientific Instruments, 1941, vol. 18, p. 154.
C. S. Barrett and A. H. Geisler: Journal of Applied Physics, 1943, vol. 152, pp. 182, 201.
H. K. Hardy and T. J. Heal: Progress in Metal Physics, 1954, vol. 5, p. 279.
A. H. Geisler, C. S. Barrett and R. F. Mehl: AIME Trans., 1943, vol. 152, p. 182.
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N. A. GJOSTEIN, Student Associate AIME, formerly Standard Oil of Indiana Fellow at Illinois Institute of Technology
TP 4303E. Manuscript, July 5, 1955. Cleveland Meeting, October 1956.
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Mondolfo, L.F., Gjostein, N.A. & Levinson, D.W. Structural Changes During the Aging in An Al-Mg-Zn Alloy. JOM 8, 1378–1385 (1956). https://doi.org/10.1007/BF03377889
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DOI: https://doi.org/10.1007/BF03377889