The Hidden Structure Dependence of the Chemical Life of Dislocations

X. Zhou, Jaber Rezaei Mianroodi, A. Kwiatkowski da Silva, T. Koenig, G. B. Thompson, Pratheek Shanthraj, D. Ponge, B. Gault, B. Svendsen, D. Raabe

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article numbereabf0563
JournalScience Advances
Volume7
Issue number16
DOIs
Publication statusPublished - 18 Mar 2021

Fingerprint

Dive into the research topics of 'The Hidden Structure Dependence of the Chemical Life of Dislocations'. Together they form a unique fingerprint.

Cite this