Faceting and Migration of Low Angle <100> Tilt Grain Boundaries in Pure Aluminum
The kinetic and structural behavior of symmetrical <100> tilt grain boundaries with rotation angles 8.4°, 12.0°, 14.3° and 16.0° were investigated in-situ in a hot stage SEM in the temperature range between 380°C and 640°C. The results revealed that depending on the rotation angle the boundary either remained straight, became faceted or curved under the driving force provided by the boundary surface tension during high temperature annealing. The transition “facetedcurved boundary” was also found to depend on temperature. The observed behavior is attributed to the anisotropy of grain boundary energy with respect to boundary inclination.
S.-J.L. Kang, M.Y. Huh, N.M. Hwang, H. Homma, K. Ushioda and Y. Ikuhara
D. M. Kirch et al., "Faceting and Migration of Low Angle <100> Tilt Grain Boundaries in Pure Aluminum", Materials Science Forum, Vols. 558-559, pp. 903-908, 2007