Open AccessStress corrosion cracking resistance of aluminum alloy 7000 series after two-step aging
Author(s) -
Bore Jegdić,
Biljana Bobić,
Milos Pavlovic,
Ana Alil,
Slaviša Putić
Publication year - 2014
Publication title -
chemical industry and chemical engineering quarterly
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.189
H-Index - 26
eISSN - 2217-7434
pISSN - 1451-9372
DOI - 10.2298/ciceq140324024j
Subject(s) - materials science , alloy , stress corrosion cracking , cracking , fracture toughness , metallurgy , fracture mechanics , stress (linguistics) , scanning electron microscope , fracture (geology) , corrosion , environmental stress fracture , composite material , aluminium , linguistics , philosophy
The effect of one step-and a new (short) two-step aging on the resistance to stress corrosion cracking of an aluminum alloy 7000 series was investigated, using slow strain rate test and fracture mechanics method. Aging level in the tested alloy was evaluated by means of scanning electron microscopy and measurements of electrical resistivity. It was shown that the alloy after the new two-step aging is significantly more resistant to stress corrosion cracking. Values of tensile properties and fracture toughness are similar for both thermal states. Processes that take place at the crack tip have been considered. The effect of the testing solution temperature on the crack growth rate on the plateau was determined. Two values of the apparent activation energy were obtained. These values correspond to different processes that control crack growth rate on the plateau at higher and lower temperatures. [Projekat Ministarstva nauke Republike Srbije, br. TR 34028 i br. TR 34016
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