Determination of Al-2.18Mg-1.92Li alloy's microstructure degradation in corrosive environment

Kozina, Franjo (author), Zovko Brodarac, Zdenka (author), Brajčinović, Sandra (author), Petrič, Mitja (author)

The utilization of aluminum-lithium-magnesium (Al-Li-Mg) alloys in the transportation industry is enabled by excellent engineering properties. The mechanical properties and corrosion resistance are influenced by the microstructure development comprehending the solidification of coherent strengthening precipitates, precipitation of course and angular equilibrium phases as well as the formation and widening of the Precipitate-free zone. The research was performed to determine the microstructure degradation of Al-2.18Mg-1.92Li alloy in a corrosive environment using electrochemical measurements. The solidification sequence of the Al-2.18Mg-1.92Li alloy, obtained using Thermo–Calc software support, indicated the transformation of the α$_{Al}$ dendritic network and precipitation of AlLi (δ), Al$_2$LiMg (T), and Al$_8$Mg$_5$ (β) phase. All of the phases are anodic with respect to the α$_{Al}$ enabling microstructure degradation. To achieve higher microstructure stability, the sample was solution hardened at 520 °C. However, the sample in as-cast condition showed a lower corrosion potential (−749.84 mV) and corrosion rate (17.01 mm/year) with respect to the solution-hardened sample (−752.52 mV, 51.24 mm/year). Higher microstructure degradation of the solution-hardened sample is a consequence of δ phase precipitation at the grain boundaries and inside the grain of α$_{Al}$, leading to intergranular corrosion and cavity formation. The δ phase precipitates from the Li and Mg enriched the α$_{Al}$ solid solution at the solution-hardening temperature.

• Language: English
• Keywords: Al-Mg-Li alloy, solidification sequence, as-cast, solution hardening, microstructure, degradation
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2021
• Number of pages: 13 str.
• Numbering: Vol. 11, iss. 4, art. 338
• PID: 20.500.12556/RUL-135201
• UDC: 669
• ISSN on article: 2073-4352
• DOI: 10.3390/cryst11040338
• COBISS.SI-ID: 80274947
• Publication date in RUL: 28.02.2022

Record is a part of a journal

• Title: Crystals
• Shortened title: Crystals
• Publisher: MDPI
• ISSN: 2073-4352
• COBISS.SI-ID: 36677893

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• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 01.04.2021