论文标题
解决在等型尼科菲克尔介质熵合金中多组分扩散的问题
Solving the issues of multicomponent diffusion in an equiatomic NiCoFeCr medium entropy alloy
论文作者
论文摘要
通过在同一组成的三个夫妇相交的传统扩散夫妇方法之后，在四组分不均匀合金中实验估算扩散系数，除非鉴定出较小的恒定扩散率的较小组成范围。另外，在具有两个以上组件的系统中估计组件的固有扩散系数。为了解决这些问题，我们遵循了伪二元和伪内扩散夫妇方法，用于估计NICOFECR介质熵合金的等准体组成处的扩散系数。除了伪二进制互扩散系数外，我们还通过设计伪二进制伴侣来估计所有组件的内在扩散系数，从而使Ni和Co开发了扩散曲线，使FE和CR保持FE和CR在一对夫妇和FE中的cr恒定，而FE和CR则在另一对偏这层中保持Ni和CO的差异使Ni和CO保持不变。随后，我们提出了使用热力学细节来计算示踪剂扩散系数的关系。我们发现，在等准组组成下直接按照辐射示意剂方法估计的数据匹配。随后，我们产生了三个伪内部扩散夫妇，在接近等准组组成的组合物处相交。发现Fe的主要伪内扩散系数高于Ni和Co。因此，我们估计了不同类型的扩散系数，突出了四组分NICOFECR介质熵合金中复杂扩散过程的不同类型。
Estimating the diffusion coefficients experimentally in a four-component inhomogeneous alloy following the conventional diffusion couple method by intersecting three couples at the same composition is difficult unless a small composition range of constant diffusivity is identified. Additionally, the intrinsic diffusion coefficients of the components cannot be estimated in a system with more than two components. To solve these issues, we have followed the pseudo-binary and pseudo-ternary diffusion couple methods for estimating the diffusion coefficients at the equiatomic composition of NiCoFeCr medium entropy alloy. Along with the pseudo-binary interdiffusion coefficients, we have estimated the intrinsic diffusion coefficients of all the components by designing the pseudo-binary couples such that Ni and Co develop the diffusion profiles keeping Fe and Cr constant in one couple and Fe and Cr develop the diffusion profiles keeping Ni and Co constant in another couple. Subsequently, we have proposed the relations for calculating the tracer diffusion coefficients utilizing the thermodynamic details. We have found a good match with the data estimated directly following the radiotracer method at the equiatomic composition. Following, we have produced three pseudo-ternary diffusion couples intersecting at the compositions close to the equiatomic composition. The main pseudo-ternary interdiffusion coefficients of Fe are found to be higher than Ni and Co. Therefore, we have estimated different types of diffusion coefficients highlighting the complex diffusion process in the four-component NiCoFeCr medium entropy alloy.
