Premium
Enhancing the intergranular corrosion resistance of high Mg‐alloyed Al–Mg alloy by Y addition
Author(s) -
Li Xinlei,
Xia Weijun,
Yan Hongge,
Chen Jihua,
Su Bin,
Li Xinyu
Publication year - 2020
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.202011722
Subject(s) - alloy , intergranular corrosion , corrosion , materials science , microstructure , metallurgy , grain boundary , 6111 aluminium alloy , annealing (glass) , precipitation , ternary operation , phase (matter) , chemistry , physics , meteorology , computer science , programming language , organic chemistry
Microalloying is thought to improve the performance of Al–Mg alloys commonly used in transport applications. The effect of Y addition (0–0.4%) on the microstructure, mechanical properties, and corrosion resistance of Al–9.2Mg–0.7Mn alloy is investigated for potential use in engineering applications. The generation of the β‐Al 3 Mg 2 phase along the grain boundaries is suppressed in the as‐cast alloy due to the formation of the AlMgY ternary phase. The average intergranular corrosion mass loss of the alloy with 0.1% Y addition decreases about 53.1% almost at no expense of mechanical performance in the as‐rolled alloy after annealing. Moreover, the alloy with 0.1% Y addition shows the corrosion mass loss about 30.2% lower than the Y‐free alloy in the sensitized state. The enhanced corrosion resistance of the alloy can be ascribed to the reduced β‐Al 3 Mg 2 precipitation along the grain boundaries associated with Y addition.