Improved intergranular corrosion resistance of Al-Mg-Mn alloys with Sc and Zr additions

Meng jia Li, Shuo Liu, Xiang dong Wang, Yun jia Shi*, Qing lin Pan, Xiao jie Zhou, Rui feng Zhang, Nick Birbilis

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    21 Citations (Scopus)

    Abstract

    Al-5.8Mg-0.4Mn with minor alloying additions of Sc and Zr was investigated via electrochemical testing and nitric acid mass loss testing (NAMLT) in order to reveal the influence of Sc and Zr upon sensitization and intergranular corrosion. The Al-Mg-Mn alloys were also analysed using an electron probe microanalyzer, indicating that β-phase (Al3Mg2) was more likely to precipitate around rectangular or cubic Al6Mn particles. Results reveal that the strength and intergranular corrosion resistance of Al-5.8Mg-0.4Mn was improved by the combined addition of Sc and Zr. The Al3(Sc1-xZrx) dispersoids can lead to an alteration of the relative proportion of low angle grain boundaries, and lower volume fraction of β-phase was observed for Al-5.8Mg-0.4Mn-xSc-yZr relative to the Sc and Zr free alloy.

    Original languageEnglish
    Article number103202
    JournalMicron
    Volume154
    DOIs
    Publication statusPublished - Mar 2022

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