Journal
SCIENCE ADVANCES
Volume 7, Issue 16, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abf0563
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Funding
- Alexander von Humboldt-Stiftung
- DFG through Priority Program 1713
- [NSF-DMR-1709803]
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Dislocations are one-dimensional defects in crystals that affect material deformation, mechanical response, and transport properties. They lead to severe lattice distortion and solute segregation, resulting in localized spatial variations in chemistry that determine microstructure and material behavior. Recent advances in atomic-scale characterization methods have revealed a wide variety of defect-specific solute decoration patterns, offering potential for compositional and structural nano-scale design of advanced materials.
Dislocations are one-dimensional defects in crystals, enabling their deformation, mechanical response, and transport properties. Less well known is their influence on material chemistry. The severe lattice distortion at these defects drives solute segregation to them, resulting in strong, localized spatial variations in chemistry that determine microstructure and material behavior. Recent advances in atomic-scale characterization methods have made it possible to quantitatively resolve defect types and segregation chemistry. As shown here for a Pt-Au model alloy, we observe a wide range of defect-specific solute (Au) decoration patterns of much greater variety and complexity than expected from the Cottrell cloud picture. The solute decoration of the dislocations can be up to half an order of magnitude higher than expected from classical theory, and the differences are determined by their structure, mutual alignment, and distortion field. This opens up pathways to use dislocations for the compositional and structural nanoscale design of advanced materials.
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