Effect of Rubidium on Solidification Parameters, Structure and Operational Characteristics of Eutectic Al-Si Alloy
Modification of the eutectic silicon in Al–Si alloys causes a structural transformation of the silicon phase from a needle-like to a fine fibrous morphology and is carried out extensively in the industry to improve mechanical properties of the alloys. The theories and mechanisms explaining the eutec...
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MDPI AG
2023-08-01
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| author | Igor A. Petrov Anastasiya D. Shlyaptseva Alexandr P. Ryakhovsky Elena V. Medvedeva Victor V. Tcherdyntsev |
| author_facet | Igor A. Petrov Anastasiya D. Shlyaptseva Alexandr P. Ryakhovsky Elena V. Medvedeva Victor V. Tcherdyntsev |
| author_sort | Igor A. Petrov |
| collection | DOAJ |
| description | Modification of the eutectic silicon in Al–Si alloys causes a structural transformation of the silicon phase from a needle-like to a fine fibrous morphology and is carried out extensively in the industry to improve mechanical properties of the alloys. The theories and mechanisms explaining the eutectic modification in Al–Si alloys are considered. We discuss the mechanism of eutectic rubidium modification in the light of experimental data obtained via quantitative X-ray spectral microanalysis and thermal analysis. X-ray mapping revealed that rubidium, which theoretically satisfies the adsorption mechanisms of silicon modification, had an effect on the silicon growth during solidification. Rubidium was distributed relatively homogeneously in the silicon phase. Microstructural studies have shown that rubidium effectively refines eutectic silicon, changing its morphology. Modification with rubidium extends the solidification range due to a decrease in the solidus temperature. The highest level of mechanical properties of the alloy under study was obtained with rubidium content in the range of 0.007–0.01%. We concluded that rubidium may be used as a modifier in Al-Si eutectic and pre-eutectic alloys. The duration of the modifying effect of rubidium in the Al-12wt%Si alloy melt and porosity in the alloy modified with rubidium were evaluated. |
| first_indexed | 2024-03-10T23:44:24Z |
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| language | English |
| last_indexed | 2024-03-10T23:44:24Z |
| publishDate | 2023-08-01 |
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| spelling | doaj.art-31322001c555419fbd23905506e30f792023-11-19T02:10:37ZengMDPI AGMetals2075-47012023-08-01138139810.3390/met13081398Effect of Rubidium on Solidification Parameters, Structure and Operational Characteristics of Eutectic Al-Si AlloyIgor A. Petrov0Anastasiya D. Shlyaptseva1Alexandr P. Ryakhovsky2Elena V. Medvedeva3Victor V. Tcherdyntsev4Moscow Aviation Institute, Orshanskaya 3, 125993 Moscow, RussiaMoscow Aviation Institute, Orshanskaya 3, 125993 Moscow, RussiaMoscow Aviation Institute, Orshanskaya 3, 125993 Moscow, RussiaInstitute of Electrophysics, Ural Branch, Russian Academy of Science, Amudsena Str., 106, 620016 Yekaterinburg, RussiaLaboratory of Functional Polymer Materials, National University of Science and Technology “MISIS”, Leninskii prosp, 4, 119049 Moscow, RussiaModification of the eutectic silicon in Al–Si alloys causes a structural transformation of the silicon phase from a needle-like to a fine fibrous morphology and is carried out extensively in the industry to improve mechanical properties of the alloys. The theories and mechanisms explaining the eutectic modification in Al–Si alloys are considered. We discuss the mechanism of eutectic rubidium modification in the light of experimental data obtained via quantitative X-ray spectral microanalysis and thermal analysis. X-ray mapping revealed that rubidium, which theoretically satisfies the adsorption mechanisms of silicon modification, had an effect on the silicon growth during solidification. Rubidium was distributed relatively homogeneously in the silicon phase. Microstructural studies have shown that rubidium effectively refines eutectic silicon, changing its morphology. Modification with rubidium extends the solidification range due to a decrease in the solidus temperature. The highest level of mechanical properties of the alloy under study was obtained with rubidium content in the range of 0.007–0.01%. We concluded that rubidium may be used as a modifier in Al-Si eutectic and pre-eutectic alloys. The duration of the modifying effect of rubidium in the Al-12wt%Si alloy melt and porosity in the alloy modified with rubidium were evaluated.https://www.mdpi.com/2075-4701/13/8/1398cast aluminum alloysmodificationrubidiummicrostructureeutectic siliconsolidification process |
| spellingShingle | Igor A. Petrov Anastasiya D. Shlyaptseva Alexandr P. Ryakhovsky Elena V. Medvedeva Victor V. Tcherdyntsev Effect of Rubidium on Solidification Parameters, Structure and Operational Characteristics of Eutectic Al-Si Alloy Metals cast aluminum alloys modification rubidium microstructure eutectic silicon solidification process |
| title | Effect of Rubidium on Solidification Parameters, Structure and Operational Characteristics of Eutectic Al-Si Alloy |
| title_full | Effect of Rubidium on Solidification Parameters, Structure and Operational Characteristics of Eutectic Al-Si Alloy |
| title_fullStr | Effect of Rubidium on Solidification Parameters, Structure and Operational Characteristics of Eutectic Al-Si Alloy |
| title_full_unstemmed | Effect of Rubidium on Solidification Parameters, Structure and Operational Characteristics of Eutectic Al-Si Alloy |
| title_short | Effect of Rubidium on Solidification Parameters, Structure and Operational Characteristics of Eutectic Al-Si Alloy |
| title_sort | effect of rubidium on solidification parameters structure and operational characteristics of eutectic al si alloy |
| topic | cast aluminum alloys modification rubidium microstructure eutectic silicon solidification process |
| url | https://www.mdpi.com/2075-4701/13/8/1398 |
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