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The tracer grain boundary diffusivity, P, of nickel in polycrystalline Ni-B, Ni-9 at% Al-B and in NiAl-B intermetallic has been measured with boron concentrations x B up to 0 3 at% B. The measurements were done by the residual activity method in the temperature interval from 773 to 1073 K. It was observed that P decreases with growing concentration of boron in Ni-B and Ni-9 at% Al-B. This...
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