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Atomic insight into the shearing behavior of precipitates in an Al-Cu-Mg-Ag alloy

ACTA MATERIALIA(2024)

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Abstract
The interaction mechanism between the precipitates and moving dislocations is one of the key factors that governs the mechanical properties of precipitation -hardened aluminum alloys. In this study, for the first time, via a combination of atomic -resolution scanning transmission electron microscopy, image simulation, and firstprinciples density functional theory calculations, we have revealed the slip system for omega ' precipitates in the Al-Cu-Mg-Ag system. Additionally, we re-examined the case for the omega precipitates and discovered a different slip system from those previously proposed. This study demonstrates the workflow of determining the slip system(s) for nano -sized precipitates and the current results can shed useful insights into understanding dislocationprecipitate interactions and predicting the strength of Al-Cu-Mg-Ag alloys.
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Key words
Al-Cu-Mg-Ag alloy,Slip system,Density functional theory,Scanning transmission electron microscopy
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