Abstract
This study was conducted in order to determine and understand the effect of substrate on the behavior of eutectic In-Sn. Samples for mechanical testing were produced with either bare Cu or Ni on Cu substrates. Both the microstructure and the mechanical behavior are strongly dependent on substrate. When eutectic In-Sn is joined to bare Cu, Cu diffusion into the joint causes the alloy to become off-eutectic, giving a nonuniform and irregular microstructure. The addition of a layer of Ni acts as a diffusion barrier, preventing Cu diffusion sufficiently such that a uniform, normal colony-based eutectic forms. Deformation is more uniform in the In-Sn on Ni, while it is concentrated along the length of the joint in the In-Sn on Cu. This distinction is reflected in the different shapes of shear stress-strain curves between In-Sn on Cu and In-Sn on Ni. The stress exponents and activation energies for creep also vary with substrate. Creep deformation is governed by the In-rich β phase for In-Sn on Cu and by the Sn-rich γ phase for In-Sn on Ni. If In-Sn on Ni samples are aged, the microstructure coarsens and the mechanical behavior changes to resemble that of the as-cast In-Sn on Cu.
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C.E.T. White and G.P. Evans:Res. Dev., 1986, vol. 28, pp. 88–90.
R. Kubiak, M. Wolcyrz, and W. Zacharko:J. Less-Common Met., 1979, vol. 65, pp. 263–69.
Fuh-Kuo Chen: Ph.D. Dissertation, University of California, Berkeley, CA, 1989.
J.L. Freer and J.W. Morris, Jr.:J. Electron. Mater., 1992, vol. 21, pp. 647–52.
J.L. Freer Goldstein: Ph.D. Dissertation, University of California, Berkeley, CA, 1993.
V.V. Slepushkin and G.S. Mukovnina:Zashch. Met., 1985, vol. 21, pp. 280–82.
F.A. Mohamed, K.L. Murty, and J.W. Morris, Jr.:Metall. Trans., 1973, vol. 4, pp. 935–40.
R. Darveaux, E. Yung, I. Turlik, and K.L. Murty:Mater. Res. Soc. Symp. Proc, 1991, vol. 203, pp. 443–48.
E.L. Bradley III: Ph.D. Dissertation, University of California, Berkeley, CA, 1993.
R.E. Eckert and H.J. Drickamer:J. Chem. Phys., 1952, vol. 20, pp. 13–17.
J.D. Meakin and E. Klokholm:Trans. TMS-AIME, 1960, vol. 218, pp. 463–66.
C. Coston and N.H. Nachtreib:J. Phys. Chem., 1964, vol. 68, pp. 2219–29.
I. Kaur, W. Gust, and L. Kozma:Handbook of Grain and Interface Boundary Diffusion, Ziegler Press, Stuttgart, Germany, 1989, pp. 1277–85.
E.I. Rabkin, L.S. Shvindlerman, and B.B. Straumal:J. Less-Common Met., 1990, vol. 158, pp. 23–33.
C.E.T. White and H. Okamoto:Phase Diagrams of Indium Alloys and Their Engineering Applications, Indium Corporation of America, Utica, NY, and ASM INTERNATIONAL, Metals Park, OH, 1992, p. 255.
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Formerly with the Department of Materials Science and Mineral Engineering, University of California at Berkeley.
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Freer Goldstein, J.L., Morris, J.W. The effect of substrate on the microstructure and creep of eutectic In-Sn. Metall Mater Trans A 25, 2715–2722 (1994). https://doi.org/10.1007/BF02649224
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DOI: https://doi.org/10.1007/BF02649224