Abstract The serration behavior of Σ3n (n ≤ 3) boundaries in Alloy 617 is investigated through electron back scattered diffraction analysis and molecular dynamics (MD) simulation. Furthermore, the implication of grain boundary serrations on the corrosion response in alloy 617 was also evaluated. While Ʃ3 boundaries are never serrated, both Ʃ9 and Ʃ27 boundaries showed mixed serration behavior. Five parameter stereological analysis has revealed that the Ʃ9 and Ʃ27 boundaries lie on both low and high index planes. This observation justifies the mixed serration behavior of Ʃ9 and Ʃ27 considering the fact that boundaries lying on high index planes possess higher surface energy as substantiated through molecular dynamics simulation. Finally, a ‘misorientation-deviation’ based approach is proposed which could mostly identify those Ʃ9 and Ʃ27 boundaries which are likely to be serrated. The corrosion studies revealed that the serrated specimen is highly resistant to corrosion against the as-received condition.

中文翻译：

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对合金 617 中 Σ3n (n≤3) 边界的锯齿行为的潜在洞察

摘要 通过电子背散射衍射分析和分子动力学(MD) 模拟研究了617 合金中Σ3n (n ≤ 3) 晶界的锯齿行为。此外，还评估了晶界锯齿对 617 合金腐蚀响应的影响。虽然 Ʃ3 边界从来没有锯齿，但 Ʃ9 和 Ʃ27 边界都表现出混合锯齿行为。五参数体视分析表明Ʃ9和Ʃ27边界位于低和高指数平面上。考虑到位于高指数平面上的边界具有更高的表面能，这一观察结果证明了 Ʃ9 和 Ʃ27 的混合锯齿行为是正确的，这一事实通过分子动力学模拟得到证实。最后，提出了一种基于“错误定向-偏差”的方法，该方法主要可以识别那些可能呈锯齿状的 Ʃ9 和 Ʃ27 边界。腐蚀研究表明，锯齿状试样在原样条件下具有很高的耐腐蚀性。