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Influence of heat treatments on the stress corrosion cracking susceptibility of 7075 aluminum wires in NaCl solutions
Author(s) -
Schnatterer C.,
Zander D.
Publication year - 2016
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201608978
Subject(s) - stress corrosion cracking , materials science , intergranular corrosion , hydrogen embrittlement , corrosion , metallurgy , alloy , cracking , aluminium , ultimate tensile strength , environmental stress fracture , stress (linguistics) , hydrogen , composite material , chemistry , linguistics , philosophy , organic chemistry
The influence of heat treatments on the stress corrosion cracking susceptibility (SCC) of industrially drawn 7075 wires was investigated in 2 wt% NaCl solution at a pH of 3. The T4 treated material showed the highest susceptibility, whereas the T6 treated alloy showed a reduced sensitivity to SCC. Over‐aging was found to reduce SCC susceptibility most effectively. The high susceptibility of the T4 treated material was proposed to be a result of the strong intergranular corrosion attack during testing, reducing the loaded cross‐section of the tensile specimen and increasing the stress level. The fatal crack formation is proposed to be a result of hydrogen embrittlement by the evolved hydrogen.