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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2008, Volume 88, Issue 8, Pages 615–620
(Mi jetpl261)
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This article is cited in 45 scientific papers (total in 45 papers)
CONDENSED MATTER
First observation of a wetting phase transition in low-angle grain boundaries
B. B. Straumala, B. S. Bokshteinb, A. B. Straumalb, A. L. Petelinb a Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia
b State Technological University "Moscow State Institute of Steel and Alloys ", Leninskii pr. 4, Moscow, 119049, Russia
Abstract:
The wetting phase transition at low-angle intercrystallite grain boundaries has been experimentally observed. In contrast to the high-angle grain boundaries with the misorientation angels θ > 15°, the low-angle grain boundaries (θ < 15°) are not continuous two-dimensional defects, but constitute a discrete wall (network) of lattice dislocations (edge and/or helical). The theory predicts that, depending on θ, either a continuous layer of the liquid phase or a wall (network) of microscopic liquid tubes on wetted dislocation nuclei is formed at completely wetted low-angle grain boundaries. It has been shown that the continuous liquid layers at low-angle grain boundaries in the Cu-Ag alloys appear at the temperature T wminL = 970°C, which is 180°C higher than the onset temperature T wmin = 790°C and 50°C lower than the finish temperature of the wetting phase transition at high-angle grain boundaries, T wmax = 1020°C.
Received: 11.08.2008 Revised: 09.09.2008
Citation:
B. B. Straumal, B. S. Bokshtein, A. B. Straumal, A. L. Petelin, “First observation of a wetting phase transition in low-angle grain boundaries”, Pis'ma v Zh. Èksper. Teoret. Fiz., 88:8 (2008), 615–620; JETP Letters, 88:8 (2008), 537–542
Linking options:
https://www.mathnet.ru/eng/jetpl261 https://www.mathnet.ru/eng/jetpl/v88/i8/p615
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