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THE INFLUENCE OF AGE‐HARDENING ON FATIGUE CRACK PROPAGATION BEHAVIOUR IN 7075 ALUMINIUM ALLOY IN VACUUM
Author(s) -
LafarieFrenot M. C.,
Gasc C.
Publication year - 1983
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1983.tb00348.x
Subject(s) - materials science , alloy , crack closure , aluminium , hardening (computing) , aluminium alloy , homogeneous , fracture mechanics , microstructure , crack growth resistance curve , metallurgy , composite material , thermodynamics , layer (electronics) , physics
— The influence of age‐hardening on the middle and low crack growth rates of a 7075 Al alloy is studied in vacuum. A transition in fracture surfaces morphology and crack growth curves is observed with the T 651 and T 7351 treatments in the near‐threshold regime. Measurements of crack closure show its dependance on surfaces roughness and explain the lack of dependance of Δ K th with load ratio, except for the T 7351 alloy. An equation of crack growth rate to the fourth power of Δ K eff is in good agreement only with the crack propagation curves obtained for microstructure with an homogeneous deformation mode.