Abstract
We have studied the early stages of θ′ precipitation in an Al-Cu-Sn alloy by atom probe field ion microscopy (APFIM) and transmission electron microscopy (TEM). Clusters of Sn atoms were observed in as-quenched samples, and their formation clearly precedes the formation of the θ′ phase. Transmission electron microscopy also revealed that elevated temperature aging leads to the formation of spherical particles. Atom probe analysis and microbeam electron diffraction suggested that these particles were β-Sn (I41/amd, α = 0.583 nm, and c = 0.318 nm). The TEM observations showed that θ′ nucleated heterogeneously on these particles. We have also examined the θ′/α interface following further precipitate growth to check for possible Sn segregation. Atom probe analysis of both the broad face and the narrow rim of the platelike θ′ precipitates has shown no evidence of Sn segregation at θ′/α interfaces. It was also found that cold work prior to aging inhibits the formation of Sn particles resulting in a lower number of these types of nucleation sites for the θ′ phase. Atom probe analysis has also revealed solute depletion at grain boundaries during the early stages of aging in the Al-Cu-Sn alloy, and this, in conjunction with vacancy depletion, explains the formation of narrow precipitate-free zones observed following further aging.
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A.H. Sully, H.K. Hardy, and TJ. Heal:J. Inst. Met, 1949-50, vol. 76, pp. 269–94.
H.K. Hardy:J. Inst. Met, 1950-51, vol. 78, pp. 169–77.
H.K. Hardy:J. Inst. Met, 1951-52, vol. 80, pp. 483–92.
J.M. Silcock, T.J. Heal, and H.K. Hardy:J. Inst. Met, 1955, vol. 84, pp. 23–31.
I.J. Polmear:Light Alloys, 2nd ed., Edward Arnold, London, 1989, pp. 83–88.
I.J. Polmear and H.K. Hardy:J. Inst Met, 1952-52, vol. 81, pp. 427- 32.
R. Sankaren and C. Laird:Acta Metall, 1974, vol. 22, pp. 957–69.
G.W. Lorimer: inPrecipitation Processes in Solids, K.C. Russell and H.I. Aaronson, eds., AIME, New York, NY, 1978, pp. 87–89.
G.B. Brook:Precipitation in Metals, Fulmer Research Institute Special Report No. 3, Stoke Poges, Bucks, United Kingdom, 1963, pp. 10–12.
J.D. Boyd and R.B. Nicholson:Acta Metall., 1971, vol. 19, pp. 1101- 09.
R. Sankaren and C. Laird:Mater. Sci. Eng., 1974, vol. 14, pp. 271- 79.
J.B.M.Van Nuyten:Acta Metall., 1967, vol. 15, pp. 1765–70.
E. Holmes and B. Noble:J. Inst. Met, 1967, vol. 95, pp. 106–10.
B. Noble:Acta Metall., 1968, vol. 16, pp. 393–401.
M. Kanno, H. Suzuki, and O. Kanoh:J. Jpn. Inst. Light Met, 1979, vol. 29, pp. 223–26.
M. Kanno, H. Suzuki, and O. Kanoh:J. Jpn. Inst. Met, 1980, vol. 44, pp. 1139–45.
H. Suzuki, M. Kanno, and I. Araki:J. Jpn. Inst Light Met., 1975, vol. 25, pp. 413–21.
J.M. Silcock:J. Inst. Met, 1955-56, vol. 84, pp. 19–22.
J.M. Silcock:Phil. Mag. A, 1959, vol. 14, pp. 1187–94.
H. Kimura and R.R. Hasiguti:Acta Metall, 1961, vol. 9, pp. 1076- 84.
M. Ohta and F. Hashimoto:J. Phys. Soc. Jpn., 1964, vol. 19, pp. 1987–91.
F.C. Duckworth and J. Burke:Phil. Mag. A, 1966, vol. 14, pp. 473–81.
W.B. Alexander and L.M. Slifkin:Phys. Rev. B, 1970, vol. 1, pp. 3274–82.
M.S. Anand and R.P. Agarwala:Phys. Status Solidi, 1970, vol. 1, pp. K41-K43.
G.M. Hood and R.J. Schultz:Phys. Rev. B, 1971, vol. 4, pp. 2339- 41.
G. Erdelyi, K. Freitag, and H. Mehrer:Phil. Mag. A, 1991, vol. 63, pp. 1167–77.
G.D. Preston:Phil. Mag. A, 1938, vol. 26, pp. 855–68.
J.M. Silcock, T.J. Heal, and H.K. Hardy:J. Inst. Met, 1953-54, vol. 82, pp. 239–48.
Binary Alloy Phase Diagrams, T.B. Massalski, H. Okamoto, P.R. Subramanian, and L. Kacprzac, eds., ASM INTERNATIONAL, Materials Park, OH, 1990, vol. 1, p. 215 and vol. 2, p. 1141.
M.K. Miller and G.D.W. Smith:Atom Probe Microanalysis, Materials Research Society, Pittsburgh, PA, 1989, pp. 37–57.
J.W. Edington:Practical Electron Microscopy in Materials Science, Van Rostrand Reinhold Co., Wokingham, United Kingdom, 1988, vol. 5, pp. 1–30.
K. Hono, T. Hashizume, and T. Sakurai:Surf. Sci., 1992, vol. 266, pp. 506–12.
A.H. Geisler:Phase Transformations in Solids, Wiley, New York, NY, 1951, p. 387.
P.C. Varley, K.B. Day, and A. Sendorek:J. Met, 1957-58, vol. 86, pp. 337–50.
J.L. Taylor:J. Inst. Met, 1963-64, vol. 92, p. 301.
J.D. Embury and R.B. Nicholson:Acta Metall, 1965, vol. 13, pp. 403–17.
J.D. Cook and J. Nutting:The Mechanisms of Phase Transformations in Crystalline Solids, Monograph and Report Series No. 33, Institute of Metals, London, 1969, pp. 54–58.
S.P. Ringer, B.C. Muddle, and I.J. Polmear:Metall. Mater. Trans., 1995, vol. 26A, pp. 0000–00.
S.P. Ringer, K. Hono, I.J. Polmear, and T. Sakurai:Proc. Int. Conf. On Solid-Solid Phase Transformations in Inorganic Materials, Pittsburgh, PA, July 17-22, 1994, W.C. Johnson, J.M. Howe, D.E. Laughlin, and W.A. Soffa, eds., TMS, Warrendale, PA, 1994, pp. 165- 70.
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Formerly Japan Society for the Promotion of Science Postdoctoral Research Fellow, Institute for Materials Research, Tohoku University
Formerly Research Associate, Institute for Materials Research, Tohoku University
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Ringer, S.P., Hono, K. & Sakurai, T. The effect of trace additions of sn on precipitation in Al-Cu alloys: An atom probe field ion microscopy study. Metall Mater Trans A 26, 2207–2217 (1995). https://doi.org/10.1007/BF02671236
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DOI: https://doi.org/10.1007/BF02671236