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本文提出了一种通过测定非平衡晶界偏聚临界时间确定空位-溶质原子复合体扩散系数的方法。按照这种方法,测出含硼Fe-30wt％Ni合金中空位-硼原子复合体的扩散系数D_v=1×10~(-5)exp(-0.94/KT)。与此同时,也确定出扩散距离公式X=2δ~(1/2)(Dt)~(1/2)中的扩散常数δ,对于上面提到的合金,其空位-硼原子复合体和硼原子的扩散常数δ=0.48。
This paper presents a method to determine the diffusion coefficient of vacancies - solute atoms complex by determining the critical time of non-equilibrium grain boundary segregation. According to this method, the diffusion coefficient D_v = 1 × 10 -5 exp (-0.94 / KT) of the vacancy-boron atom complex in the boron-containing Fe-30wt% Ni alloy was measured. At the same time, the diffusion constant δ in the diffusion distance formula X = 2δ ~ (1/2) (Dt) ~ (1/2) is also determined. For the above-mentioned alloy, the vacancy- boron atom complex and boron The atomic diffusion constant δ = 0.48.