Microstructure, Mechanical and Corrosion Properties of 5E61 Alloy

Abstract:

The microstructure of Al-6Mg-0.9Mn-0.07Zr-0.2Er (wt.%), registered as 5E61 alloy, were investigated using optical microscopy, scanning electron microscopy and transmission electron microscopy. The results showed that the addition of 0.2 wt.% Er can refine the dendritic structure and form fine and coherent L1₂ structured Al₃(Er_xZr_1-x) precipitates in the alloy. After a two-stage homogenization (280°C/10h, 460°C/36h), the recrystallization temperature of the alloy with 0.2 wt.% Er is about 15°C higher than that of the alloy without Er. The better recrystallization resistance may be related to the Al₃(Er_xZr_1-x) precipitates, which can pin on dislocations and sub-grain boundaries. The hardness of the cold-rolled alloy with 0.2 wt.% Er is 143HV, which is 5% higher than the alloy without Er. The exfoliation corrosion and nitric acid mass loss test were also performed. The exfoliation corrosion of the alloy is N grade, and the mass loss is only 9.84mg/cm².

• Periodical: Materials Science Forum (Volume 898)
• Pages: 29-34
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.29
• Online since: June 2017
• Authors: Pei Liang Liu, Xiao Lan Wu*, Sheng Ping Wen, Hui Huang, Kun Yuan Gao, Zuo-Ren Nie
• Keywords: 5E61, Corrosion, Mechanical Properties, Microstructure

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