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Article

Determination of Al-2.18Mg-1.92Li Alloy’s Microstructure Degradation in Corrosive Environment

1
Faculty of Metallurgy, University of Zagreb, 44000 Sisak, Croatia
2
Faculty of Natural Sciences and Engineering, University of Ljubljana, SI-1000 Ljubljana, Slovenia
*
Authors to whom correspondence should be addressed.
Academic Editor: Hyokyung Sung
Crystals 2021, 11(4), 338; https://doi.org/10.3390/cryst11040338
Received: 21 February 2021 / Revised: 24 March 2021 / Accepted: 25 March 2021 / Published: 27 March 2021
(This article belongs to the Special Issue Advance in Alloy Materials)
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 αAl dendritic network and precipitation of AlLi (δ), Al2LiMg (T), and Al8Mg5 (β) phase. All of the phases are anodic with respect to the αAl 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 αAl, leading to intergranular corrosion and cavity formation. The δ phase precipitates from the Li and Mg enriched the αAl solid solution at the solution-hardening temperature. View Full-Text
Keywords: Al-Mg-Li alloy; solidification sequence; as-cast; solution hardening; microstructure; degradation Al-Mg-Li alloy; solidification sequence; as-cast; solution hardening; microstructure; degradation
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MDPI and ACS Style

Kozina, F.; Brodarac, Z.Z.; Brajčinović, S.; Petrič, M. Determination of Al-2.18Mg-1.92Li Alloy’s Microstructure Degradation in Corrosive Environment. Crystals 2021, 11, 338. https://doi.org/10.3390/cryst11040338

AMA Style

Kozina F, Brodarac ZZ, Brajčinović S, Petrič M. Determination of Al-2.18Mg-1.92Li Alloy’s Microstructure Degradation in Corrosive Environment. Crystals. 2021; 11(4):338. https://doi.org/10.3390/cryst11040338

Chicago/Turabian Style

Kozina, Franjo, Zdenka Z. Brodarac, Sandra Brajčinović, and Mitja Petrič. 2021. "Determination of Al-2.18Mg-1.92Li Alloy’s Microstructure Degradation in Corrosive Environment" Crystals 11, no. 4: 338. https://doi.org/10.3390/cryst11040338

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