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Reversing Sensitization Of Naturally Exfoliated 5456-H116 Aluminum Alloys, Ren-Yu Chen, Cheng-Chyuan Lai
Reversing Sensitization Of Naturally Exfoliated 5456-H116 Aluminum Alloys, Ren-Yu Chen, Cheng-Chyuan Lai
Journal of Marine Science and Technology
5456-H116 Al-Mg alloy has been broadly used in the U.S. Navy in order to meet the demand of reducing ship hull weight while considering high specific strength, corrosion resistance, and weldability. A particular concern of these alloy is sensitization, which causes it to be sensitized when highly anodic β phase (Al3Mg2) is precipitated at grain boundaries especially in service exceeding 65~200°C, leading to intergranular corrosion (IGC), exfoliation and stress corrosion cracking (SCC). This study investigated the reversal of sensitization of a naturally exfoliated 5456-H116 alloy plate by planned heating treatment with a short exposure to 250°C. The properties of sensitized …