Solid-phase wetting at grain boundaries in the Zr-Nb system |
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| Authors: | A S Gornakova B B Straumal A L Petelin A B Straumal |
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| Institution: | 1.Institute of Solid-State Physics,Russian Academy of Sciences,Chernogolovka,Russia;2.National University of Science and Technology MISiS,Moscow,Russia |
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| Abstract: | The microstructure of Zr-Nb polycrystalline alloys with niobium concentrations of 1, 2.5, 4, and 8 wt % is investigated in
the temperature interval of 620–840°C. It is revealed that the second solid phase β-Nb forms either a chain of separate lens-like
precipitates or continuous homogeneous layers at grain boundaries in zirconium, depending on the annealing temperature and
the energy of the Zr/Zr grain boundary. It is shown that the greater the quantity of the second solid phase, the lower is
the temperature of the termination of grain-boundary wetting. A model is constructed that explains the dependence of the temperature
of grain boundary wetting on the amount of wetting phase. It is found that the complete wetting of all grain boundaries in
zirconium by the second solid phase does not occur in Zr-Nb alloys. |
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