The micromechanisms of fatigue crack growth in a commercial Al-Zn-Mg-Cu alloy
作者： K.J. Nix , H.M. Flower
DOI: 10.1016/0001-6160(82)90175-4
关键词: Aluminium alloy 、 Crack closure 、 Materials science 、 Paris' law 、 Striation 、 Fracture (geology) 、 Hydrogen embrittlement 、 Cleavage (crystal) 、 Metallurgy 、 Fracture toughness 、 General Engineering
摘要: Abstract A detailed fractographic and microstructural study, using combined scanning transmission electron microscopy has been made of the fracture surfaces produced by fatigue a commercial aluminium alloy 7010:T76 in moist air, dry argon oxygen. In environments is entirely ductile: surface non-crystallographic essentially striation free. air occurs cleavage on {110} coupled with plastic deformation during blunting closing crack: this results formation well defined striations. Striation topography controlled local orientation plane to direction maximum tensile stress slip systems highest shear stress. consequence range profiles are developed. It suggested that component growth result hydrogen embrittlement matrix ahead crack dislocation transport necessary introduce hydrogen.
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