Influence of equal-channel angular pressing on the corrosion fatigue behaviour of an Al-Mg-Si aluminium alloy for automotive conductors

Clement Rochet (1, 2) , Eric Andrieu (1) , Babak Arfaei (3) , Jean-Paul Harouard (2) , Adrien Laurino (2) , Terry Lowe (4) , Grégory Odemer (1) , Christine Blanc (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 LEONI WIRING SYSTEMS FRANCE (FRANCE)
3 Ford Motor Company
4 Colorado School of Mines

The influence of equal channel angular pressing (ECAP) on the corrosion fatigue behaviour of an Al-Mg-Si alloy was studied. Preliminary fatigue tests in air showed an increase in fatigue lifetime for ECAP samples, as compared to as-received samples, related to the ECAP-induced grain refinement. After pre-corrosion, the fatigue lifetime was lower for ECAP samples than for as-received samples, because the fragmentation of coarse intermetallics during ECAP led to an increase in the density of corrosion defects.C orrosion fatigue tests demonstrated a synergy between cyclic mechanical loading and corrosion processes for all samples; a deleterious effect of ECAP was also noted.

Mots clés: Aluminium alloys; Brittle fracture; Cold working; Corrosion fatigue

Domaines: Matériaux

Clement Rochet, Eric Andrieu, Babak Arfaei, Jean-Paul Harouard, Adrien Laurino, et al.. Influence of equal-channel angular pressing on the corrosion fatigue behaviour of an Al-Mg-Si aluminium alloy for automotive conductors. International Journal of Fatigue, 2020, 140, pp.105812. ⟨10.1016/J.IJFATIGUE.2020.105812⟩. ⟨hal-03033280⟩