Effect of Rare Earth Elements (Y, La) on Microstructural Characterization and Corrosion Behavior of Ternary Mg-Y-La Alloys
In this study, the microstructural properties and corrosion behavior of RE elements (Y, La) added to magnesium in varying minors after casting and homogenization heat treatment were investigated. Three-phase structures, such as α-Mg, lamellae-like phases, and network-shaped eutectic compounds, were...
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MDPI AG
2023-07-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/14/5141 |
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| author | Mohamed Ali Ibrahim Alwakwak Ismail Esen Hayrettin Ahlatcı Esma Keskin |
| author_facet | Mohamed Ali Ibrahim Alwakwak Ismail Esen Hayrettin Ahlatcı Esma Keskin |
| author_sort | Mohamed Ali Ibrahim Alwakwak |
| collection | DOAJ |
| description | In this study, the microstructural properties and corrosion behavior of RE elements (Y, La) added to magnesium in varying minors after casting and homogenization heat treatment were investigated. Three-phase structures, such as α-Mg, lamellae-like phases, and network-shaped eutectic compounds, were seen in the microstructure results. The dendrite-like phases were evenly distributed from the eutectic compounds to the interior of the α-Mg grains, while the eutectic compounds (α-Mg + Mg) RE (La/Y)) were distributed at the grain boundaries. According to the corrosion results, the typical hydroxide formation for lanthanum content caused the formation of crater structures in the material, and with the increase in lanthanum content, these crater structures increased both in depth and in density. In addition, the corrosion products formed by Y<sub>2</sub>O<sub>3</sub> and Y(OH)<sub>3</sub> in the Mg-3.21Y-3.15 La alloy increased the thickness of the corrosion film and formed a barrier that protects the material against corrosion. The thinness of the protective barrier against corrosion in the Mg-4.71 Y-3.98 La alloy is due to the increased lanthanum and yttrium ratios. In addition, the corrosion resistance of both Mg-3.21Y-3.15 La and Mg-4.71 Y-3.98 La alloys decreases after homogenization. This negative effect on corrosion is due to the coaxial distribution of oxide/hydroxide layers formed by yttrium and lanthanum after homogenization. |
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| id | doaj.art-bfe247363ac24fce981fd435dfd83d68 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T00:53:10Z |
| publishDate | 2023-07-01 |
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| series | Materials |
| spelling | doaj.art-bfe247363ac24fce981fd435dfd83d682023-11-18T20:18:35ZengMDPI AGMaterials1996-19442023-07-011614514110.3390/ma16145141Effect of Rare Earth Elements (Y, La) on Microstructural Characterization and Corrosion Behavior of Ternary Mg-Y-La AlloysMohamed Ali Ibrahim Alwakwak0Ismail Esen1Hayrettin Ahlatcı2Esma Keskin3Mechanical Engineering Department, Karabuk University, Karabuk 78050, TurkeyMechanical Engineering Department, Karabuk University, Karabuk 78050, TurkeyMetallurgical and Materials Engineering Department, Karabuk University, Karabuk 78050, TurkeyMetallurgical and Materials Engineering Department, Karabuk University, Karabuk 78050, TurkeyIn this study, the microstructural properties and corrosion behavior of RE elements (Y, La) added to magnesium in varying minors after casting and homogenization heat treatment were investigated. Three-phase structures, such as α-Mg, lamellae-like phases, and network-shaped eutectic compounds, were seen in the microstructure results. The dendrite-like phases were evenly distributed from the eutectic compounds to the interior of the α-Mg grains, while the eutectic compounds (α-Mg + Mg) RE (La/Y)) were distributed at the grain boundaries. According to the corrosion results, the typical hydroxide formation for lanthanum content caused the formation of crater structures in the material, and with the increase in lanthanum content, these crater structures increased both in depth and in density. In addition, the corrosion products formed by Y<sub>2</sub>O<sub>3</sub> and Y(OH)<sub>3</sub> in the Mg-3.21Y-3.15 La alloy increased the thickness of the corrosion film and formed a barrier that protects the material against corrosion. The thinness of the protective barrier against corrosion in the Mg-4.71 Y-3.98 La alloy is due to the increased lanthanum and yttrium ratios. In addition, the corrosion resistance of both Mg-3.21Y-3.15 La and Mg-4.71 Y-3.98 La alloys decreases after homogenization. This negative effect on corrosion is due to the coaxial distribution of oxide/hydroxide layers formed by yttrium and lanthanum after homogenization.https://www.mdpi.com/1996-1944/16/14/5141MgRE elementscorrosion behaviormicrostructure |
| spellingShingle | Mohamed Ali Ibrahim Alwakwak Ismail Esen Hayrettin Ahlatcı Esma Keskin Effect of Rare Earth Elements (Y, La) on Microstructural Characterization and Corrosion Behavior of Ternary Mg-Y-La Alloys Materials Mg RE elements corrosion behavior microstructure |
| title | Effect of Rare Earth Elements (Y, La) on Microstructural Characterization and Corrosion Behavior of Ternary Mg-Y-La Alloys |
| title_full | Effect of Rare Earth Elements (Y, La) on Microstructural Characterization and Corrosion Behavior of Ternary Mg-Y-La Alloys |
| title_fullStr | Effect of Rare Earth Elements (Y, La) on Microstructural Characterization and Corrosion Behavior of Ternary Mg-Y-La Alloys |
| title_full_unstemmed | Effect of Rare Earth Elements (Y, La) on Microstructural Characterization and Corrosion Behavior of Ternary Mg-Y-La Alloys |
| title_short | Effect of Rare Earth Elements (Y, La) on Microstructural Characterization and Corrosion Behavior of Ternary Mg-Y-La Alloys |
| title_sort | effect of rare earth elements y la on microstructural characterization and corrosion behavior of ternary mg y la alloys |
| topic | Mg RE elements corrosion behavior microstructure |
| url | https://www.mdpi.com/1996-1944/16/14/5141 |
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