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This article is cited in 35 scientific papers (total in 35 papers)
CONDENSED MATTER
“Wetting” phase transitions by the second solid phase for linear defects (grain boundary triple junctions)
A. B. Straumalab, I. A. Mazilkinba, K. V. Tsoib, B. Baretzkyc, B. B. Straumalabc a National University of Science and Technology MISiS, Moscow, 119049 Russia
b Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region,142432 Russia
c Institute of Nanotechnology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, 76344 Germany
Abstract:
In this work, the wetting phase transition of grain boundaries (GBs) and their triple junctions (GB TJs) by the second solid phase in the magnesium-based alloy EZ33A is studied. The condition for complete wetting for the GB TJ ($\sigma_{\text{GB}}>\sqrt{3}\sigma_{\text{SS}}$) is weaker than that for GBs ($\sigma_{\text{GB}}>2\sigma_{\text{SS}}$). Therefore, if the transition from partial to complete wetting occurs with increasing temperature, then all GB TJs should become completely wetted at a temperature $T_{\text{wTJ}}$, which is lower than the temperature $T_{\text{wGB}}$, at which all GBs become completely wetted. For the first time, it has been found experimentally that GB TJs are completely wetted at $T_{\text{wTJ}}=(380\pm10)\,^\circ$C, which is approximately $70^\circ$C lower than $T_{\text{wGB}}=(450\pm10)\,^\circ$C. The wetting phase at the GBs is the intermetallic compound (Mg,Zn)$_{12}$RE. A similar phenomenon was previously observed for GB TJ wetting with a liquid phase [B.B. Straumal, O. Kogtenkova, and P. Zieba, Acta Mater. 56, 925 (2008)].
Received: 16.07.2020 Revised: 21.07.2020 Accepted: 21.07.2020
Citation:
A. B. Straumal, I. A. Mazilkin, K. V. Tsoi, B. Baretzky, B. B. Straumal, ““Wetting” phase transitions by the second solid phase for linear defects (grain boundary triple junctions)”, Pis'ma v Zh. Èksper. Teoret. Fiz., 112:4 (2020), 275–280; JETP Letters, 112:4 (2020), 257–261
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https://www.mathnet.ru/eng/jetpl6243 https://www.mathnet.ru/eng/jetpl/v112/i4/p275
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