Abstract
In this work, the solidification and segregation behaviors of 8090 Al-Li alloy have been investigated with differential thermal analysis (DTA) and the metallographic-electron microprobe method. The results show that 8090 Al-Li alloy has a much more complex solidification path than Al-Li binary alloy due to the addition of many alloying elements and the presence of impure elements. Solidification begins at about 635 °C with the reaction of L → α-Al + L′, and this reaction goes on to termination. The alloying element Cu and impure elements Fe and Si have a strong segregation tendency. During solidification, Cu segregates to the interdendrite and finally forms α-Al + T2 eutectic. As a result, the solidification temperature range is greatly extended. Iron and Si form the insoluble constituents Al7Cu2Fe, AlLiSi,etc., although their concentrations in the alloy are quite low. With the increase of Fe content, there is a eutectic reaction of α-Al/Al3Fe at about 595 °C. The formation of insoluble constituents is influenced by both concentrations of impure elements in the alloy and the cooling rate.
Similar content being viewed by others
References
E.J. Lavernia, T.S. Srivatsan, and F.A. Mohamed:J. Mater. Sci., 1990, vol. 25, pp. 1137–58.
V.K.T. Rao and R.O. Ritchie:Mater. Sci. Technol., 1989, vol. 5, p. 882.
T.S. Srivatsan and T. Alan Place:J. Mater. Sci., 1989, vol. 24, p. 1543.
S. Kang and N.J. Grant: inAluminum-Lithium Alloys 11, Proc. 2nd Int. Conf. on Aluminum-Lithium Alloys, E.A. Starke, Jr. and T.H. Sanders, Jr., eds., Monterey, California, Apr. 12–14, 1983, The Metallurgical Society of AIME, Warrendale, PA, 1983, p. 469.
K. Dinsdale, S.J. Harris, and B. Noble: inAluminum-Lithium Alloys, Proc. 1st Int. Conf. on Aluminum-Lithium Alloys, T.H. Sanders, Jr. and E.A. Starke, Jr., eds., Georgia, TMS-AIME, Warrendale, PA, 1981, p. 219.
M.H. Tosten, J.M. Galbraith, and P.R. Howell:J. Mater. Sci. Lett., 1987, vol. 6, p. 51.
N.C. Parson and T. Sheppard: inAluminum-Lithium III, Proc. 3rd Int. Conf. on Aluminum-Lithium Alloys, C. Baker, P.J. Gregson, S.J. Harris and C.J. Peel, eds., Oxford, UK, July 8–11, 1985, The Institute of Metals, London, 1986, p. 222.
T.H. Sanders, Jr. and E.A. Starke, Jr.: inAluminum-Lithium V, Proc. 5th Int. Conf. on Aluminum-Lithium Alloys, T.H. Sanders, Jr. and E.A. Starke, Jr., eds., Williamsburg, Virginia, March 27–31, 1989, Materials and Component Eng. Publ. Ltd., Birmingham, UK, 1989, p. 1.
H.M. Flower and P.J. Gregson:Mater. Sci. Technol., 1987, vol. 3, p. 81.
A.K. Hardy and J.W. Silcock:J. Inst. Met., 1955-1956, vol. 84, p. 423.
Sinn-Wen Chen, Howard W. Beumler, and Y. Austin Chang:Metall. Trans. A, 1991, vol. 22A, pp. 203–13.
Sinn-Wen Chen, Ying-Yu Chuang, Y. Austin Chang, and Men G. Chu:Metall. Trans. A, 1991, vol. 22A, pp. 2837–48.
S.W. Chen, C.H. Jan, J.C. Lin, and Y.A. Chang:Metall. Trans. A, 1989, vol. 20A, p. 2247.
B. Dubost, C. Colinet, and I. Ansara: inAluminum-Lithium V, Proc. 5th Int. Conf. on Aluminum-Lithium Alloys, T.H. Sanders, Jr. and E.A. Starke, Jr., eds., Williamsburg, Virginia, March 27–31, 1989, Materials and Component Eng. Publ. Ltd., Birmingham, UK, 1989, p. 623.
M.C. Flemings:Solidification Processing, McGraw-Hill Book Co., New York, NY, 1974, pp. 31–87.
L.F. Mondolfo:Aluminum Alloys: Structure and Properties, Butterworth’s, Sevenoaks, United Kingdom, 1976, pp. 566–75.
Y.L. Liu: Ph.D. Thesis, Institute of Metals Research, Academia Sinica, Shenyang, People’s Republic of China, 1992.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Liu, Y.L., Hu, Z.Q., Zhang, Y. et al. The solidification behavior of 8090 Al-Li alloy. Metall Trans B 24, 857–865 (1993). https://doi.org/10.1007/BF02663146
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02663146