Experimental and modelling assessment of ductility in a precipitation hardening AlMgScZr alloy

Precipitation hardening is the most effective strategy to enhance mechanical properties of metals. Dislocation mechanisms control strengthening during precipitation have been demonstrated extensively. However, owing complexity different precipitates in alloys, variations ductility caused by are complex and not clarified so far. In this study, effects on aluminium alloys investigated based a modified dislocation-based approach experimental characterisation. The AlMgScZr alloy with spherical Al3(Sc, Zr) used as model system understand ductility. Via heat treatment, shearable nonshearable introduced AlMg matrix. results show that decreases when occur, while it increases being replaced precipitates. variation mainly controlled dynamic recovery rate dislocations. Finally, analysing precipitate–dislocation interactions evaluating dislocation density evolution deformation, for demonstrated. This study reveals mechanism controlling which can provide theoretical foundation design high-performance structural materials.