论文标题
Deadloying金属中的晶界影响：多相现场研究
Grain Boundary Effects in Dealloying Metals: A Multi-Phase Field Study
论文作者
论文摘要
采用多相现场模型来研究经历液体交易合金的微结构演化。提出的模型扩展了Geslin等人的原始方法。考虑在存在晶界的情况下进行交易。该模型是使用光谱方法使用半平时阶梯式算法实现的，该方法可以在长时间尺度上模拟大型2D和3D域，同时仍保持现实的界面厚度。该模型的行动是为了证明耦合的晶型迁移机制，以保持与此期间这种拓扑结合的固体液体界面保持平衡接触角。这种机制在局部加速了交易，通过将较不高贵的合金金属溶解（并拒绝较高的金属）迁移到迁移的晶界，从而将液态通道的扩散耦合增长增强到前体中。与已发表的实验观察结果的定性一致性，迁移的晶界的更深腐蚀通道不对称地破坏了最终交易结构的韧带连通性。结果表明，这些晶界迁移辅助腐蚀通道即使对于少量溶解合金物种的前体，即所谓的\ textit {分配极限}
A multi-phase field model is employed to study the microstructural evolution of an alloy undergoing liquid dealloying. The model proposed extends upon the original approach of Geslin et al. to consider dealloying in the presence of grain boundaries. The model is implemented using a semi-implicit time stepping algorithm using spectral methods, which enables simulating large 2D and 3D domains over long time-scales while still maintaining a realistic interfacial thickness. The model is exercised to demonstrate a mechanism of coupled grain-boundary migration to maintain equilibrium contact angles with this topologically-complex solid-liquid interface during dealloying. This mechanism locally accelerates dealloying by dissolving the less noble alloy metal from (and rejecting the more noble metal into) the migrating grain boundary, thereby enhancing the diffusion-coupled-growth of the liquid channel into the precursor. The deeper corrosion channel at the migrating grain boundary asymmetrically disrupts the ligament connectivity of the final dealloyed structure, in qualitative agreement with published experimental observations. It is shown that these grain boundary migration-assisted corrosion channels form even for precursors with small amounts of the dissolving alloy species, below the so-called \textit{parting limit}
