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Wetting transition of grain-boundary triple junctions

✍ Scribed by B.B. Straumal; O. Kogtenkova; P. Zięba

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
732 KB
Volume
56
Category
Article
ISSN
1359-6454

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✦ Synopsis

The wetting phase transition of grain boundaries (GBs) and grain-boundary triple junctions (GB TJs) by the melt has been studied in the Al-30 wt.%Zn and Al-10 wt.%Zn-4 wt.%Mg polycrystals. The condition of complete wetting is weaker for TJs (r GB > ffiffi ffi 3 p r SL ) than that for GBs (r GB > 2r SL ), r GB being the GB energy and 2r SL being 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 T wGB . It has been experimentally observed for the first time that TJs become completely wetted at T wTJ , which is about 10-15 °C below T wGB .

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