Abstract
The sessile-drop method and high-temperature small-angle x-ray diffraction technique were used to characterize the density of liquid Al–Si alloys with Si content C = 0 to 22 wt%. A distinct abnormal volume expansion of the hyper-eutectic melts was identified just above the liquidus (within TL–Tk) during the heating sequence (h.s.), which is irreversible during the cooling sequence (c.s.). This phenomenon is explained by the segregation of Si atoms from the supersaturated “quasi-eutectic” structure and formation of silicon clusters in the superheated melt. In addition, a pre-peak in the x-ray diffraction spectrum of Al–14% Si melt was observed at 850 °C, which is associated with the silicon clusters. The pre-peak remains when the superheated melt is cooled down to the liquidus (670 °C); this result is in accord with the density measurements.
Similar content being viewed by others
References
P.M. Smith, J.W. Elmer, and G.F. Gallegos, Scripta Mater. 40, 937 (1999).
H. Sasaki., E. Tokizaki, K. Terashima, and S. Kimura, Jpn. J. Appl. Phys. 33, 3803 (1994).
H. Nakanishi, K. Nakazato, K. Abe, S. Maeda, and K. Terashima, J. Cryst. Growth 203, 75 (1999).
G.G. Doge, Z. Naturforsch 21, 266 (1966).
F. Bashforth and J.G. Adams, An Attempt to Test the Theories Of Capillary Actions (University Press, Cambridge, United Kingdom, 1883).
K. Mukai and Z. Yuan, Mater. Trans. JIM 41, 323 (2000).
G.G. Kryshenko, V.I. Shpakov, V.I. Nikitin, and S.I. Torshilova, Izb. AN SSSR. Metalle. 4, 204 (1977).
P.S. Popel, E.L. Demina, E.L. Arhangelskii, and B.A. Baum, Teplofiz. Besokih. Temp. T25, 487 (1987).
C. Maze and G. Burnet, Surf. Sci. 13, 450 (1969).
T. Iida and R. Guthrie, The Physical Properties of Liquid Metals (Clarendon, Oxford, United Kingdom, 1993), p. 233.
K. Okajima, S. Matsubuchi, and H. Sakao, Tran. Japan Inst. Met. 26, 183 (1985).
Y. Waseda, K. Shinoda, K. Sugiyama, S. Takeda, K. Terashima, and J.M. Toguri, Jpn. J. Appl. Phys. 34, 4124 (1995).
W. Cahn Nature 323, 668 (1986).
Z.H Jin, H.W. Sheng, and K. Lu, Phys. Rev. B 60, 141 (1999).
J. Gabathuler, S. Steeb, and P. Lamparter, Z. Naturforsch 34a, 1305 (1979).
S. Krishnan and D.L. Price, J. Phys: Condens. Matter 12, R145 (2000).
J. Bletry, Z. Naturforsh 33a, 327 (1978).
M. Saboungi, J. Marr, and M. Blander, J. Chem. Phys. 68, 1375 (1978).
K. Okajima, S. Matsubuchi, and H. Sakao, Trans. JIM. 26, 183 (1985).
K. Okajima and H. Sakao, Trans. JIM. 22, 347 (1981).
Y. Waseda, The Structure of Non-Crystalline Materials (McGraw-Hill, New York, 1980).
A.C. Barnes, M.A. Hamilton, U. Beck, and H.E. Fischer, J. Phys.: Condens. Matter 12, 7311 (2000).
H.Y. Hsieh, B.H. Toby, T. Egami, Y. He, and S.J. Poon, J. Mater. Res. 5, 2807 (1990).
L. Cervinka, J. Non-Cryst. Solids 232–234, 1 (1998).
S. Ansell, S. Krishna, J.J. Felten, and D.L. Price, J Phys. Condens. Matter 10, L73 (1998).
D.L. Price, S.C. Moss, R. Reijers, M. Saboungi, and S. Susman, J. Phys. C: Solid State Phys. 21, L1069 (1988).
W.M. Wang, X.F. Bian, J. Y. Qin, and S.I. Syliusarenko, Metall. Mater. Trans. A 31, 2163 (2000).
A.J. Pedraza, in Lasers in Materials, edited by R.P. Agarwala, Mater. Sci. Forum 301, 69 (1999).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Wang, W.M., Bian, X.F., Wang, H.R. et al. Origin of the anomalous volume expansion in Al–Si alloys above liquidus. Journal of Materials Research 16, 3592–3598 (2001). https://doi.org/10.1557/JMR.2001.0492
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1557/JMR.2001.0492