On the origin of extremely high strength of ultrafine–grained Al alloys produced by severe plastic deformation

Ruslan Valiev (1) , Nariman Enikeev (1) , Maxim Murashkin (1) , V. Kazykhanov (1) , Xavier Sauvage (2)

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

Ultrafine–grained Al alloys produced by high pressure torsion are found to exhibit a very high strength, considerably exceeding the Hall–Petch predictions for the ultrafine grains. The phenomena can be attributed to the unique combination of ultrafine structure and deformation–induced segregations of solute elements along grain boundaries, which may affect the emission and mobility of intragranular dislocations.

Mots clés: Ultrafine–grained materials; Al alloys; high pressure torsion; Hall–Petch relationship; segregation

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

Ruslan Valiev, Nariman Enikeev, Maxim Murashkin, V. Kazykhanov, Xavier Sauvage. On the origin of extremely high strength of ultrafine–grained Al alloys produced by severe plastic deformation. Scripta Materialia, 2010, 63, pp.949. ⟨10.1016/j.scriptamat.2010.07.014⟩. ⟨hal-00526517⟩