Slip transmission across plate-shaped Ω nano-precipitates in Al-Cu-Mg-Ag alloys

WQ Wu and SL Yang and JF Nie and A Misra and J Wang, SCRIPTA MATERIALIA, 259, 116539 (2025).

DOI: 10.1016/j.scriptamat.2025.116539

Atomistic simulations, crystallographic analysis and experimental HAADF- STEM images were used to elucidate the dislocation mechanisms of shearing Omega phase (Al2Cu) nano-plates in Al-Cu-Mg-Ag alloys. Slip transmission across the Omega phase was found to be associated with the 1/4101(101)Omega slip system because of a higher geometric compatibility factor and a lower residual dislocation magnitude associated with this slip system as compared to others. This study highlights the role of nano-plate size, shape and geometry on the impeding effect on dislocation motion and the plastic co-deformation capability associated with slip transmission.

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