Wetting transition of grain-boundary triple junctions
Wetting transition of grain-boundary triple junctions
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DOI：
10.1016/j.actamat.2007.10.043
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发表时间：
2008-03
期刊：
影响因子：
9.4
通讯作者：
B. Straumal;O. Kogtenkova;P. Ziȩba
中科院分区：
文献类型：
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作者：
B. Straumal;O. Kogtenkova;P. Ziȩba
研究了Al-30 wt.%合金中熔体对晶界和晶界三结点的润湿相变Zn和Al-10 wt.% Zn-4wt.%镁多晶体。完全润湿的条件对TJ（σGB>3σSL）比对GB（σGB>2σSL）弱，σ GB为GB能，2σ SL为固/液界面能。因此，TJ润湿转变温度应低于GB润湿转变温度TwGB。首次在实验中观察到TJ在TwTJ下完全润湿，TwTJ比TwGB低约10-15°C。
The wetting phase transition of grain boundaries (GBs) and grain-boundary triple junctions (GB TJs) by the melt has been studied in the Al–30wt.%Zn and Al–10wt.%Zn–4wt.%Mg polycrystals. The condition of complete wetting is weaker for TJs (σGB>3σSL) than that for GBs (σGB>2σSL), σGBbeing the GB energy and 2σSLbeing the energy of the solid/liquid interphase boundary. As a result the temperature of TJ wetting transition should be lower than that of GB wetting transition TwGB. It has been experimentally observed for the first time that TJs become completely wetted at TwTJ, which is about 10–15°C below TwGB.