Nanostructure and related mechanical properties of an Al-Mg-Si alloy processed by severe plastic deformation

Gulnaz Nurislamova (1, 2) , Xavier Sauvage (1) , Maxim Murashkin (2) , Rinat Islamgaliev (2) , Ruslan Valiev (2)

1 GPM - Groupe de physique des matériaux
2 IPAM - Institute for Physics of Advanced Materials

Microstructural features and mechanical properties of an Al-Mg-Si alloy processed by high-pressure torsion have been investigated using transmission electron microscopy, X-ray diffraction, three-dimensional atom probe, tensile tests and microhardness measurements. It is shown that HPT processing of the Al-Mg-Si alloy leads to a much stronger grain size refinement than of pure aluminium (down to 100 nm). Moreover, massive segregation of alloying elements along grain boundaries is observed. This nanostructure exhibits a yield stress even two times higher than that after a standard T6 heat treatment of the coarse grained alloy

Mots clés: Aluminum alloys; severe plastic deformation; nanostructure; segregation

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Gulnaz Nurislamova, Xavier Sauvage, Maxim Murashkin, Rinat Islamgaliev, Ruslan Valiev. Nanostructure and related mechanical properties of an Al-Mg-Si alloy processed by severe plastic deformation. Philosophical Magazine Letters, 2008, 88 (6), pp.459. ⟨10.1080/09500830802186938⟩. ⟨hal-00314142⟩