Abstract
The contact angle θ at the intersection of a grain boundary in Al bicrystals with the solid Al/liquid Al−Sn interphase boundary has been measured for two symmetric tilt <011> {001} grain boundaries with tilt angles ϕ of 32° and 38.5°. The temperature dependencies θ(T) present the evidence of the grain boundary wetting phase transition at Tw. The observed hysteresis is consistent with the assumption that the wetting transition is of first order. The determined discontinuity in the temperature derivative of the grain boundary energy is−5.6 μJ/m2K (T w1=617°C) for the boundary with a low energy (ϕ=38.5°) and −17 μJ/m2K (T w2=604°C) for the grain boundary with a high energy (ϕ=32°).
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Straumal, B.B., Gust, W. & Molodov, D.A. Wetting transition on grain boundaries in Al contacting with a Sn-rich melt. Interface Sci 3, 127–132 (1995). https://doi.org/10.1007/BF00207014
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DOI: https://doi.org/10.1007/BF00207014