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Determination of Al-2.18Mg-1.92Li alloy's microstructure degradation in corrosive environment
ID Kozina, Franjo (Author), ID Zovko Brodarac, Zdenka (Author), ID Brajčinović, Sandra (Author), ID Petrič, Mitja (Author)

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Abstract
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 This link opens in a new window
UDC:669
ISSN on article:2073-4352
DOI:10.3390/cryst11040338 This link opens in a new window
COBISS.SI-ID:80274947 This link opens in a new window
Publication date in RUL:28.02.2022
Views:811
Downloads:96
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Record is a part of a journal

Title:Crystals
Shortened title:Crystals
Publisher:MDPI
ISSN:2073-4352
COBISS.SI-ID:36677893 This link opens in a new window

Licences

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

Projects

Funder:Other - Other funder or multiple funders
Funding programme:University of Zagreb, Faculty of Metallurgy
Project number:IP-124

Funder:Other - Other funder or multiple funders
Funding programme:Ministry of Science and Education, Infrastructural scientific projects
Project number:KK.01.1.1.02.0020
Name:Centre for Foundry Technology—SIMET

Funder:EC - European Commission
Funding programme:European Regional Development Fund, Operational Programme Competitiveness and Cohesion
Project number:KK.01.1.1.02.0022
Name:VIRTULAB—Integrated laboratory for primary and secondary raw materials

Funder:Other - Other funder or multiple funders
Funding programme:University of Zagreb, Framework of Financial Support of Research
Project number:FPI-124-2019-ZZB
Name:Design and Characterization of Innovative Engineering Alloys

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