Abstract
Two quaternary Al-Li-Cu-Zr alloys have been investigated using electron microscopy. Ageing at 190° C resulted in the nucleation ofθ′ precipitates on the Al3Zr/matrix interface in addition to heterogeneous nucleation on matrix dislocations. In the majority of cases, the broad, coherent face of theθ′ plans ms in contact with the Al3Zr precipitates. Similar evidence showed that nucleation of T1 precipitates occurred on the Al3Zr, but to a lesser extent thanθ′. Solid-solid nucleation theory has been used to account for the Al3Zr acting as a nucleation substrate.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
T. H. Sanders Jr andE. A. Starke Jr, (eds) in “Aluminum-Lithium Alloys” (TMS-AIMS, Warrendale, PA. 1981).
T. H. Sanders Jr andE. A. Starke Jr (eds) in “Aluminum-Lithium Alloys II” (TMS-ATME, Warrendale, PA, 1984).
A. K. Vasudevan, R. C. Malcom, W. G. Fricke andR. J. Rioja, “Resistance to Fracture, Fatigue and Stress of Al-Cu-Li-Zr Alloys”, Final Report, NAVAIR Contract No. N00019-80-C-0569, (1985).
E. Ness andN. Ryum,Scripta. Metall. 5 (1971) 987.
E. Ness,Acta Metall. 20 (1972) 499.
W. Stimson, M. H. Tosten, P. R. Howell andD. B. Williams, in Proceedings of the 3rd International Al-Li Conference, Oxford (The Institute of Metals, London, 1980.
P. L. Makin andB. Ralph,J. Mater. Sci. 19 (1984) 3835.
P. J. Gregson andH. M. Flower,J. Mater. Sci. Lett. 3 (1984) 829.
M. H. Tosten, A. K. VasudevanandP. R. Howell, in Proceedings of the 3rd International Al-Li Conference, Oxford (The Institute of Metals, London, 1986) p. 490.
R. F. Hehemann, in “Phase Transformations” (ASM, Metals Park, Ohio, 1970) p. 397.
C. W. Spencer andD. J. Mack, in “Decomposition of Austenite by Diffusional Processes” (Interscience, New York, 1962) p. 549.
R. B. Nicholson, in “Phase Transformations” (ASM, Metals Park, Ohio, 1970) p. 269.
J. W. Gibbs, in “On the Equilibrium of Heterogeneous Substances, Collected Works” (Longsmans, New York, 1928).
W. C. Johnson, C. L. White, P. E. Marth, P. K. Ruf, S. M. Tuominen, K. D. Wade, K. C. Russell andH. I. Aaronson,Metall. Trans. A 6A (1975) 911.
P. E. Marth, H. I. Aaronson, G. W. Lorimer, T. L. Bartel andK. C. Russell,Metall. Trans. A 7A 1976) 153.
J. M. Simerska andV. Synecek,Acta. Metall. 15 (1967) 223.
M. H. Jacobs andD. W. Pashley, in “The Mechanism of Phase Transformations in Crystalline Solids” (Institute of Metals, London, 1969) p. 43.
G. W. Lorimer,Fizika 2 (1970) 331.
G. W. Lorimer andR. B. Nicholson, in “The Mechanism of Phase Transformations in Crystalline Solids” (Institute of Metals, London, 1969) p. 36.
G. W. Lorimer andR. B. Nicholson,Acta. Metall. 14 (1966) 1009.
P. N. T. Unwin, G. W. Lorimer andR. B. Nicholson,ibid. 17 (1969) 136.
H. A. Holl,Metal Sci. J. 1 (1967) 111.
D. W. Pashley, J. Rhodes andA. Dendorek,J. Inst. Met. 94 (1966) 41.
D. W. Pashley, M. H. Jacobs andJ. T. Vietz,Phil. Mag. 16 (1967) 51.
J. P. Simon andP. Guyot,J. Mater. Sci. 12 (1978) 202.
D. Vaughan,Acta. Metall. 16 (1968) 563.
B. Forest andM. Biscondi,J. Mater. Sci. 12 (1978) 202.
H. I. Aaronson, J. B. Clark andC. Laird,Met. Sci. J. 2 (1968) 155.
R. D. Doherty,Met. Sci. 16 (1982) 1.
S. F. Baumann andD. B. Williams,Scripta. Metall. 18 (1984) 611.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Galbraith, J.M., Tosten, M.H. & Howell, P.R. On the nucleation ofθ′ and T1 on Al3Zr precipitates in Al-Li-Cu-Zr alloys. J Mater Sci 22, 27–36 (1987). https://doi.org/10.1007/BF01160548
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF01160548