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

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arxiv 2009.00432 v1 pith:SYBO5DQG submitted 2020-09-01 cond-mat.mtrl-sci

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

classification cond-mat.mtrl-sci
keywords boundarygrainasymmetricexcessag-richdiagramlengthnanofacet
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In this work, we experimentally establish the isothermal nanofacet evolution at an asymmetric 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.

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