Influence of alloyed Sc and Zr, and heat treatment on microstructures and stress corrosion cracking of Al–Zn–Mg–Cu alloys

Microstructure, mechanical properties and stress corrosion cracking of Al–Zn–Mg–Zr alloy sheet with trace amount of Sc

“…With the increase of the strain, the stress increases rapidly and then holds constant or decreases to some extent after reaching the peak stress value. Through the SSRT, the susceptibility index of the stress corrosion of the studied alloys is derived.According to the obtained results and the literatures[45][46], Eq. (3) is used to evaluate the index of susceptibility to SCC.…”

Some effects of alloy composition on stress corrosion cracking in Al–Zn–Mg–Cu alloys

“…Intergranular stress corrosion cracking (SCC) of aluminium alloys continues to be a significant issue with 7xxx series Al-Zn-Mg-Cu alloys [1,2], especially observed for short-transverse (S-L and S-T) crack orientations in plate and forgings. SCC depends on numerous variables, such as alloy composition, ageing condition, and environment (e.g.…”

Influence of Contaminated NH3 on Stress Corrosion Behavior of 7075 High Strength Aluminum Alloy in Marine Atmosphere Environment

“…Burleigh [14] reviewed the earlier research on aluminum alloy SCC and believed that anodic dissolution type SCC mainly occurs in Al-Cu-Mg alloy, while hydrogen induced cracking type SCC exists in Al-Zn-Mg-Cu alloy. In contrast, a great number of later researches argued that the synergy mechanism of the two types can better explain the essence of high strength Aluminum Alloy SCC [8][9][10]. In this paper, the addition of significantly promoted the stress corrosion behavior of the two kinds of high strength aluminum alloy.…”

“…We believe that this is because the natural environment corrosion test generally needs a long time, but the completed test is mainly concerned with the weight loss and morphology change for the corrosion. It is difficult to carry out in-depth study of its stress corrosion behavior.Recently, researchers usually use the tensile test in the solution for the study of stress corrosion of aluminum alloy [8][9][10]. But in the marine atmosphere, the essence of aluminum alloy corrosion is the electricity chemical process in unsteady thin electrolytes layer whose thickness, shape and distribution will be of cyclical changes due to temperature, humidity, light, rainfall and other factors with alternating effects.…”