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Enhancement of the Icosahedral Quasicrystalline Phase Forming Ability with Be Addition to an Al62.5Cu25.5Fe12 Alloy

  • S.M. Lee (a1), B.H. Kim (a2), W.T. Kim (a2) and D.H. Kim (a2)

Abstract

The quasicrystalline phase forming ability, solidification structure, thermal stability, and phase relationships of a series of conventionally-cast Al62-xCu25.5Fe12.5Bex (x=0,1,3,5,7) alloys were investigated. Single icosahedral quasicrystalline phase was successfully obtained by partial replacement of Al with Be (7 at.%) in an Al62Cu25.5Fe12.5 alloy during crucible cooling. The I-phase in an Al55Cu25.5Fe12.5Be7 alloy has the same face-centered icosahedral structure as that in an Al62Cu25.5Fe12.5 alloy, with less phason strain. Hardness of the I-phase increases with x, i.e. from Hv 710 for x=1 to Hv 809 for x=7.

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[1] Tsai, A.P., Inoue, A., and Masumoto, T., Jpn. J. Appl. Phys., 26, L1505 (1987).
[2] Tsai, A.P., Inoue, A., and Masumoto, T., Jpn. J. Appl. Phys., 30, 463 (1989).
[3] Dong, C., Boissieu, M.de, Dubois, J.M., Pannetier, J., and Janot, C., J. Mater. Sci. Letts., 8 (1989).
[4] Rosas, G. and Perez, R., Materials Lett., 36, 229 (1998).
[5] Lee, S.M., Lee, B.H., Kim, W.T., and Kim, D.H., accepted in J. Mater. Res. (2001).

Enhancement of the Icosahedral Quasicrystalline Phase Forming Ability with Be Addition to an Al62.5Cu25.5Fe12 Alloy

  • S.M. Lee (a1), B.H. Kim (a2), W.T. Kim (a2) and D.H. Kim (a2)

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