Grain Boundary Solute Drag Model in Regular Solution Alloys
Grain Boundary Solute Drag Model in Regular Solution Alloys
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DOI：
10.1103/physrevlett.127.175503
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发表时间：
2021-10-22
影响因子：
8.6
通讯作者：
Abdeljawad, Fadi
中科院分区：
文献类型：
--
作者：
Alkayyali, Malek;Abdeljawad, Fadi
提出了规则固溶体合金的晶界(GB)溶质阻力模型。该模型考虑了体相和晶界中的溶质-溶质相互作用，并捕捉到了单层、多层和不对称偏析等效应。我们的分析表明，对理想溶液热力学的偏离起着至关重要的作用，其中溶质阻力随溶质-溶质相互作用参数的变化而变化。此外，还发现GB偏析的不对称性引入了一个额外的成分来溶解阻力。提出了一种普遍的溶质阻力-GB速度关系，并用它解释了最近在多种工程合金中观察到的缓慢晶粒长大现象。
We present a grain boundary (GB) solute drag model in regular solution alloys. The model accounts for solute-solute interactions in both the bulk and GBs and captures effects such as monolayer, multilayer, and asymmetrical segregation. Our analysis shows that deviations from ideal solution thermodynamics play a paramount role, in which solute drag is shown to scale with solute-solute interaction parameters. Further, it is found that the asymmetry in GB segregation introduces an additional component to solute drag. A universal solute drag-GB velocity relation is proposed and used to explain recent experimental observations of sluggish grain growth in a wide range of engineering alloys.