Grain boundary diffusion of cobalt in Ni of purity level 99.98 wt% was measured over a wide temperature interval using the radiotracer technique and applying the ⁵⁷Co radioisotope. The diffusion experiments were performed in Harrison’s type B and C kinetic regimes. Temperature dependences of triple product and grain boundary diffusivity of Co in Ni have been determined. The value of grain-boundary segregation factor of cobalt in nickel was determined to be about unity in the temperature interval under investigation. It is demonstrated that the purer the material, the higher is the grain-boundary diffusivity and the lower the corresponding activation enthalpy of diffusion.

中文翻译：

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镍中57 Co的晶界扩散

使用放射性示踪技术并应用⁵⁷ Co放射性同位素在宽温度区间内测量了纯度为99.98 wt％的Ni中钴的晶界扩散。扩散实验是在哈里森的B型和C型动力学方案中进行的。已经确定了三元产物的温度依赖性和Co在Ni中的晶界扩散率。在所研究的温度区间中，确定了镍中钴的晶界偏析因子的值约为1。结果表明，材料越纯，晶界扩散率越高，相应的扩散激活焓越低。