Grain-boundary segregation effect on the strength in Al bicrystals doped with Mg and Ni. Results of MD-modeling
Karkina L.E.1, Karkin I.N.1
1M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
Email: lidiakarkina@gmail.com
The effect of the ordered grain-boundary segregations in Al-3 at.%Mg and Al-3 at.%Ni alloys on the grain-boundary (GB) fracture was studied using the atomistic modelling method. It was demonstrated that for symmetrical and asymmetric grain boundaries of a special type Σ5 with a tilt axis <001>, the GB fracture resistance of Al-Ni alloy increased significantly compared with Al. For Al-Mg, the effect of Mg segregation on GB was weak, ambiguous, and depended on the type of plane within GB width along which the fracture occurred. Keywords: segregations, grain boundaries, atomistic modelling, grain boundary facture.
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