Faceting diagram for Ag segregation induced nanofaceting at an asymmetric Cu tilt grain boundary

[Display omitted] In this work, we experimentally establish the isothermal nanofacet evolution at an asymmetric ∑5 tilt grain boundary in the Cu-Ag system using a diffusion couple approach. We investigate the nanofacet formation along the grain boundary in dependence of the Ag solute excess concentr...

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Bibliographic Details
Published in:Acta materialia 2021-08, Vol.214, p.116960, Article 116960
Main Authors: Peter, Nicolas J., Duarte, Maria J., Kirchlechner, Christoph, Liebscher, Christian H., Dehm, Gerhard
Format: Article
Language:English
Subjects:
Copper
Copper alloys
Grain boundary phase transformation
Grain boundary segregation
Scanning/Transmission electron microscopy (STEM)
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Summary:[Display omitted] In this work, we experimentally establish the isothermal nanofacet evolution at an asymmetric ∑5 tilt grain boundary in the Cu-Ag system using a diffusion couple approach. We investigate the nanofacet formation along the grain boundary in dependence of the Ag solute excess concentration. The initial grain boundary dissociates into asymmetric Ag-lean segments and Ag-rich symmetric (210) segments. Increasing Ag excess leads to an increase in Ag-rich facet segment length, while the length of the asymmetric facets remains constant. From this, we construct a grain boundary nanofaceting diagram deduced from our experiments relating local atomic structure, overall inclination and Ag solute excess.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2021.116960