Effect of Fe-Bearing Phases on the Mechanical Properties and Fracture Mechanism of Al–2wt.%Cu–1.5wt.%Mn (Mg,Zn) Non-Heat Treatable Sheet Alloy
The effects of Fe-bearing phases on the structure, mechanical properties, and fracture mechanism of a non-heat-treatable model sheet alloy (wt.%: Al–2%Cu–1.5%Mn(-Mg,Zn)), designed for Al<sub>20</sub>Cu<sub>2</sub>Mn<sub>3</sub> dispersoids, was investigated. This...
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MDPI AG
2023-11-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/13/11/1911 |
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| author | Nikolay Belov Torgom Akopyan Kirill Tsydenov Stanislav Cherkasov Natalia Avxentieva |
| author_facet | Nikolay Belov Torgom Akopyan Kirill Tsydenov Stanislav Cherkasov Natalia Avxentieva |
| author_sort | Nikolay Belov |
| collection | DOAJ |
| description | The effects of Fe-bearing phases on the structure, mechanical properties, and fracture mechanism of a non-heat-treatable model sheet alloy (wt.%: Al–2%Cu–1.5%Mn(-Mg,Zn)), designed for Al<sub>20</sub>Cu<sub>2</sub>Mn<sub>3</sub> dispersoids, was investigated. This involved a combination of thermodynamic modeling in the Thermo-Calc program and experimental studies of structure and mechanical properties. It has been shown that the addition of 0.5 and 0.4% iron and silicon leads to the formation of eutectic inclusions in the Al<sub>15</sub>(Mn,Fe)<sub>3</sub>Si<sub>2</sub> phase. In addition to the Fe- bearing inclusions, the formation of the eutectic Al<sub>2</sub>Cu and Al<sub>2</sub>CuMg phases can be expected in the as-cast structure of the experimental alloys. Despite their relatively high fraction of eutectic particles, non-homogenized alloy ingots demonstrated sufficiently high deformation processability during the hot (400 °C) and cold rolling, which made it possible to obtain high-quality sheet alloys (with reduction degrees of 80 and 75%, respectively). The results of the tensile tests revealed that, after cold rolling, the addition of 1% Mg significantly increased the tensile and yield strengths, whereas the effect of 1% Zn was negligible. At the same time, the uniform distribution of Fe-bearing phases in the structure of the cold-rolled sheets contributes to the preservation of the dimple mechanism of the fracture toughness. This helps to maintain the same level of ductility for the cold-rolled sheet Fe-containing alloys as for Fe-free alloys. It has been shown, based on the data obtained, that adding Fe, Si, Mg, and Zn to the base Al–2%Cu–1.5%Mn alloy in a total amount of more than 3% makes it possible to retain the ductile fracture patterns of the base alloy and obtain a fairly higher level of mechanical properties. This suggests the fundamental possibility of using a variety of secondary raw materials (containing the main elements present in aluminum alloys of different alloying systems) to prepare a base alloy that does not require homogenization or thermal hardening. |
| first_indexed | 2024-03-09T16:35:58Z |
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| id | doaj.art-1ac19fed292844cf97bb1de6f947befa |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T16:35:58Z |
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| spelling | doaj.art-1ac19fed292844cf97bb1de6f947befa2023-11-24T14:56:03ZengMDPI AGMetals2075-47012023-11-011311191110.3390/met13111911Effect of Fe-Bearing Phases on the Mechanical Properties and Fracture Mechanism of Al–2wt.%Cu–1.5wt.%Mn (Mg,Zn) Non-Heat Treatable Sheet AlloyNikolay Belov0Torgom Akopyan1Kirill Tsydenov2Stanislav Cherkasov3Natalia Avxentieva4Department of Metal Forming, National University of Science and Technology MISiS, 4 Leninsky Pr., Moscow 119049, RussiaDepartment of Metal Forming, National University of Science and Technology MISiS, 4 Leninsky Pr., Moscow 119049, RussiaDepartment of Metal Forming, National University of Science and Technology MISiS, 4 Leninsky Pr., Moscow 119049, RussiaDepartment of Metal Forming, National University of Science and Technology MISiS, 4 Leninsky Pr., Moscow 119049, RussiaDepartment of Metal Forming, National University of Science and Technology MISiS, 4 Leninsky Pr., Moscow 119049, RussiaThe effects of Fe-bearing phases on the structure, mechanical properties, and fracture mechanism of a non-heat-treatable model sheet alloy (wt.%: Al–2%Cu–1.5%Mn(-Mg,Zn)), designed for Al<sub>20</sub>Cu<sub>2</sub>Mn<sub>3</sub> dispersoids, was investigated. This involved a combination of thermodynamic modeling in the Thermo-Calc program and experimental studies of structure and mechanical properties. It has been shown that the addition of 0.5 and 0.4% iron and silicon leads to the formation of eutectic inclusions in the Al<sub>15</sub>(Mn,Fe)<sub>3</sub>Si<sub>2</sub> phase. In addition to the Fe- bearing inclusions, the formation of the eutectic Al<sub>2</sub>Cu and Al<sub>2</sub>CuMg phases can be expected in the as-cast structure of the experimental alloys. Despite their relatively high fraction of eutectic particles, non-homogenized alloy ingots demonstrated sufficiently high deformation processability during the hot (400 °C) and cold rolling, which made it possible to obtain high-quality sheet alloys (with reduction degrees of 80 and 75%, respectively). The results of the tensile tests revealed that, after cold rolling, the addition of 1% Mg significantly increased the tensile and yield strengths, whereas the effect of 1% Zn was negligible. At the same time, the uniform distribution of Fe-bearing phases in the structure of the cold-rolled sheets contributes to the preservation of the dimple mechanism of the fracture toughness. This helps to maintain the same level of ductility for the cold-rolled sheet Fe-containing alloys as for Fe-free alloys. It has been shown, based on the data obtained, that adding Fe, Si, Mg, and Zn to the base Al–2%Cu–1.5%Mn alloy in a total amount of more than 3% makes it possible to retain the ductile fracture patterns of the base alloy and obtain a fairly higher level of mechanical properties. This suggests the fundamental possibility of using a variety of secondary raw materials (containing the main elements present in aluminum alloys of different alloying systems) to prepare a base alloy that does not require homogenization or thermal hardening.https://www.mdpi.com/2075-4701/13/11/1911Al–Cu–Mn–Mg–Zn–Fe–Si systemFe-bearing phasesrolled sheetsAl<sub>20</sub>Cu<sub>2</sub>Mn<sub>3</sub> dispersoidsmechanical propertiesfracture mechanism |
| spellingShingle | Nikolay Belov Torgom Akopyan Kirill Tsydenov Stanislav Cherkasov Natalia Avxentieva Effect of Fe-Bearing Phases on the Mechanical Properties and Fracture Mechanism of Al–2wt.%Cu–1.5wt.%Mn (Mg,Zn) Non-Heat Treatable Sheet Alloy Metals Al–Cu–Mn–Mg–Zn–Fe–Si system Fe-bearing phases rolled sheets Al<sub>20</sub>Cu<sub>2</sub>Mn<sub>3</sub> dispersoids mechanical properties fracture mechanism |
| title | Effect of Fe-Bearing Phases on the Mechanical Properties and Fracture Mechanism of Al–2wt.%Cu–1.5wt.%Mn (Mg,Zn) Non-Heat Treatable Sheet Alloy |
| title_full | Effect of Fe-Bearing Phases on the Mechanical Properties and Fracture Mechanism of Al–2wt.%Cu–1.5wt.%Mn (Mg,Zn) Non-Heat Treatable Sheet Alloy |
| title_fullStr | Effect of Fe-Bearing Phases on the Mechanical Properties and Fracture Mechanism of Al–2wt.%Cu–1.5wt.%Mn (Mg,Zn) Non-Heat Treatable Sheet Alloy |
| title_full_unstemmed | Effect of Fe-Bearing Phases on the Mechanical Properties and Fracture Mechanism of Al–2wt.%Cu–1.5wt.%Mn (Mg,Zn) Non-Heat Treatable Sheet Alloy |
| title_short | Effect of Fe-Bearing Phases on the Mechanical Properties and Fracture Mechanism of Al–2wt.%Cu–1.5wt.%Mn (Mg,Zn) Non-Heat Treatable Sheet Alloy |
| title_sort | effect of fe bearing phases on the mechanical properties and fracture mechanism of al 2wt cu 1 5wt mn mg zn non heat treatable sheet alloy |
| topic | Al–Cu–Mn–Mg–Zn–Fe–Si system Fe-bearing phases rolled sheets Al<sub>20</sub>Cu<sub>2</sub>Mn<sub>3</sub> dispersoids mechanical properties fracture mechanism |
| url | https://www.mdpi.com/2075-4701/13/11/1911 |
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