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The effect of thermal exposure at 70 and 100 °C on intergranular corrosion (IGC) susceptibility of AA5083 alloy has been studied. At both temperatures, metastable β′ phase has been detected at grain boundaries. The thermal exposure resulted in sensitized microstructure in the alloy and, consequently, increased mass loss values during the nitric acid mass loss test (NAMLT). The sensitization of the...
It was revealed that an AA5083 alloy had been severely sensitized after 40 years in service at ground atmosphere temperature. The degree of sensitization of the various regions through the alloy plate thickness is different, which is associated with the non‐uniform distribution of Mg through the plate thickness. The alloy plate exhibits Mg‐rich bands that promoted the heterogeneous distribution of...
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