The motion of a curved grain boundary, with a so-called surface triple junction, in bicrystals was considered. The migration of a 37.5°, 39.9° and 40.6° <111> grain boundary with such a junction was measured experimentally. The effect of the surface triple junction upon grain boundary motion was explained in terms of the dynamic equilibrium of boundary and junction velocities. The boundary motion in samples with differing boundary curvatures revealed a strict proportionality of boundary velocity and driving force. This confirmed that, over the entire temperature range investigated, the surface triple junction did not affect the boundary motion.

Effect of “Surface” Triple Junction on Curved Boundary Motion in Al-Bicrystals. V.A.Ivanov, D.A.Molodov, L.S.Shvindlerman, G.Gottstein: Acta Materialia, 2004, 52[4], 969-75