Prediction of the strength of aged Al-Cu alloys with non-hybrid and hybrid 100(Al) plates

VS Krasnikov and MR Gazizov and AE Mayer and PA Bezborodova and VV Pogorelko and RO Kaibyshev, COMPUTATIONAL MATERIALS SCIENCE, 207, 111331 (2022).

DOI: 10.1016/j.commatsci.2022.111331

The effect of precipitate hybridization on macroscopic strengthening in aluminum alloys is investigated on the example of Al-Cu alloy using multiscale approach combining molecular dynamics (MD), continuum modeling and discrete dislocation dynamics (DDD). Non-hybrid and hybrid 100Al plates are considered to involve theta'-phase and theta'-phase in the core and Guinier-Preston zone (GP-like) structure along the broad interfaces, respectively. MD simulations evidence a complex dislocation- precipitate interaction mechanism involving bypassing of both hybrid and non-hybrid 100(Al) plates by dislocations at early deformation stages and their shearing by the following dislocations. MD results are used to calibrate a continuum model of dislocation precipitate interactions in 2D DDD. The shear strength of alloy with hybrid precipitates is found to be 20% higher than that for non-hybrid plates at the same Cu content exceeding 2 wt%.

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