Discontinuous segregation patterning across disconnections

• DOI: 10.1016/j.actamat.2023.118724
• Publication Date: 2023-01-25T16:34:52Z
• Authors: Chongze Hu; Stéphane Berbenni; Douglas L. Medlin; Rémi Dingreville
• Keywords: Disconnection; Discontinuity (linguistics); Nanocrystalline material

Twinning is a frequent deformation mechanism in nanocrystalline metals, and segregation of solute atoms at twin boundaries thermodynamic process that plays an important role the stability strengthening these materials. In pristine, defect-free boundaries, generally follows single- or multilayer patterned coverage solutes uniformly symmetrically distributed sites across boundary. However, when disconnection, type interfacial line defect, present boundary, we report possible discontinuity patterns this defect for broad range binary alloys. The change pattern explained by break local symmetry disconnection terraces. characteristics are dictated orientation dislocation content sitting step region its synergistic/antagonistic interactions with character. These findings not only advance our understanding origin interface phenomena key contribution from defects, but they also shed light on applications tailoring atomically precise structures to design alloys emerging properties.