3D atom probe study of solute atoms clustering during natural ageing and pre-ageing of an Al-Mg-Si alloy

F. de Geuser (1) , Williams Lefebvre (1) , D. Blavette (1)

1 GPM - Groupe de physique des matériaux

The pair-correlation function applied to 3D Atom Probe reconstructed volumes has been used to study the influence of a pre-ageing treatment (363 K) on the early stages of precipitation at 458K in an Al-Mg-Si 6016 alloy. Mg-Si short-range positive pair correlation (clustering) is shown to form after a pre-ageing treatment. The hetero-atomic clusters are thought to act as preferential nucleation sites and lead to a finer dispersion of precipitates after ageing.

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Matériaux; Instrumentations et Détecteurs [physics.ins-det]

F. de Geuser, Williams Lefebvre, D. Blavette. 3D atom probe study of solute atoms clustering during natural ageing and pre-ageing of an Al-Mg-Si alloy. Philosophical Magazine Letters, 2006, 86 (4), pp.227--234. ⟨10.1080/09500830600643270⟩. ⟨hal-00408093⟩