Effect of solution treatment temperature on grain boundary composition and environmental hydrogen embrittlement of an Al–Zn–Mg–Cu alloy
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In: Vacuum, Vol. 184.2021, No. February, 109937, 02.2021.
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TY - JOUR
T1 - Effect of solution treatment temperature on grain boundary composition and environmental hydrogen embrittlement of an Al–Zn–Mg–Cu alloy
AU - Moshtaghi, Masoud
AU - Safyari, Mahdieh
AU - Hojo, Tomohiko
N1 - Publisher Copyright: © 2020 Elsevier Ltd
PY - 2021/2
Y1 - 2021/2
N2 - The effect of solution treatment temperature on hydrogen embrittlement (HE) of an Al–Zn–Mg–Cu alloy was investigated. Slow strain rate tensile tests in humid air and dry nitrogen gas were used to calculate the index of susceptibility to HE. Fracture morphology of the specimens were observed by scanning electron microscope. The grain boundary segregation of Mg, Zn and Cu was investigated using Auger electron spectroscopy for the specimens solution-treated in the temperature range 400–480 °C after fracture by a tensile test inside a vacuum chamber. The results showed that there is a strong correlation among the concentration of Mg, Zn and Cu at grain boundary, the index of susceptibility to HE and the fraction of brittle signatures in the fracture surfaces of the specimens with different solution treatment temperatures. When the segregation of the solutes kept at the minimum (at 440 °C), the HE behavior of the specimen was greatly improved.
AB - The effect of solution treatment temperature on hydrogen embrittlement (HE) of an Al–Zn–Mg–Cu alloy was investigated. Slow strain rate tensile tests in humid air and dry nitrogen gas were used to calculate the index of susceptibility to HE. Fracture morphology of the specimens were observed by scanning electron microscope. The grain boundary segregation of Mg, Zn and Cu was investigated using Auger electron spectroscopy for the specimens solution-treated in the temperature range 400–480 °C after fracture by a tensile test inside a vacuum chamber. The results showed that there is a strong correlation among the concentration of Mg, Zn and Cu at grain boundary, the index of susceptibility to HE and the fraction of brittle signatures in the fracture surfaces of the specimens with different solution treatment temperatures. When the segregation of the solutes kept at the minimum (at 440 °C), the HE behavior of the specimen was greatly improved.
U2 - 10.1016/j.vacuum.2020.109937
DO - 10.1016/j.vacuum.2020.109937
M3 - Article
VL - 184.2021
JO - Vacuum
JF - Vacuum
SN - 0042-207X
IS - February
M1 - 109937
ER -
