Microstructural evolution and mechanical properties of rheocast Al-7.1WT%Si alloy
Effects of Semi-Solid Rheocasting (SSR) process on the structure and mechanical properties of Al-7.1wt%Si alloy were studied. The results showed that the non-dendritic structure could be formed by a short stirring period below liquidus temperature provided that stirring was combined with localized r...
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| Format: | Article |
| Language: | English |
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The Netherlands Press
2016-09-01
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| Series: | Metallurgical & Materials Engineering |
| Subjects: | |
| Online Access: | http://metall-mater-eng.com/index.php/home/article/view/230 |
| _version_ | 1797964144207462400 |
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| author | Mehdi Raeissia Behzad Niroumandb |
| author_facet | Mehdi Raeissia Behzad Niroumandb |
| author_sort | Mehdi Raeissia |
| collection | DOAJ |
| description | Effects of Semi-Solid Rheocasting (SSR) process on the structure and mechanical properties of Al-7.1wt%Si alloy were studied. The results showed that the non-dendritic structure could be formed by a short stirring period below liquidus temperature provided that stirring was combined with localized rapid heat extraction from the melt. The effect was examined by calculation of the time needed for detachment of dendrite arms at the initial stages of solidification and was associated with a large particle density in the rheocast slurry. Samples processed in semisolid state had lower porosity, higher tensile strength and higher elongation than that processed in fully-liquid state. The SSR- processed sample had a lower tensile strength but a higher elongation than the sample cooled without localized cooling and stirring. It was suggested that the lower strength of SSR-processed alloy was related to the inability of the α-particles to restrain crack propagation through the brittle eutectic matrix. |
| first_indexed | 2024-04-11T01:40:28Z |
| format | Article |
| id | doaj.art-b6bc502489194e45989c9ed570adad95 |
| institution | Directory Open Access Journal |
| issn | 2217-8961 |
| language | English |
| last_indexed | 2024-04-11T01:40:28Z |
| publishDate | 2016-09-01 |
| publisher | The Netherlands Press |
| record_format | Article |
| series | Metallurgical & Materials Engineering |
| spelling | doaj.art-b6bc502489194e45989c9ed570adad952023-01-03T08:25:01ZengThe Netherlands PressMetallurgical & Materials Engineering2217-89612016-09-01223155164222Microstructural evolution and mechanical properties of rheocast Al-7.1WT%Si alloyMehdi RaeissiaBehzad NiroumandbEffects of Semi-Solid Rheocasting (SSR) process on the structure and mechanical properties of Al-7.1wt%Si alloy were studied. The results showed that the non-dendritic structure could be formed by a short stirring period below liquidus temperature provided that stirring was combined with localized rapid heat extraction from the melt. The effect was examined by calculation of the time needed for detachment of dendrite arms at the initial stages of solidification and was associated with a large particle density in the rheocast slurry. Samples processed in semisolid state had lower porosity, higher tensile strength and higher elongation than that processed in fully-liquid state. The SSR- processed sample had a lower tensile strength but a higher elongation than the sample cooled without localized cooling and stirring. It was suggested that the lower strength of SSR-processed alloy was related to the inability of the α-particles to restrain crack propagation through the brittle eutectic matrix.http://metall-mater-eng.com/index.php/home/article/view/230Semisolid rheocasting, particle density, Dendrite arm detachment, Ripening model, Tensile strength. |
| spellingShingle | Mehdi Raeissia Behzad Niroumandb Microstructural evolution and mechanical properties of rheocast Al-7.1WT%Si alloy Metallurgical & Materials Engineering Semisolid rheocasting, particle density, Dendrite arm detachment, Ripening model, Tensile strength. |
| title | Microstructural evolution and mechanical properties of rheocast Al-7.1WT%Si alloy |
| title_full | Microstructural evolution and mechanical properties of rheocast Al-7.1WT%Si alloy |
| title_fullStr | Microstructural evolution and mechanical properties of rheocast Al-7.1WT%Si alloy |
| title_full_unstemmed | Microstructural evolution and mechanical properties of rheocast Al-7.1WT%Si alloy |
| title_short | Microstructural evolution and mechanical properties of rheocast Al-7.1WT%Si alloy |
| title_sort | microstructural evolution and mechanical properties of rheocast al 7 1wt si alloy |
| topic | Semisolid rheocasting, particle density, Dendrite arm detachment, Ripening model, Tensile strength. |
| url | http://metall-mater-eng.com/index.php/home/article/view/230 |
| work_keys_str_mv | AT mehdiraeissia microstructuralevolutionandmechanicalpropertiesofrheocastal71wtsialloy AT behzadniroumandb microstructuralevolutionandmechanicalpropertiesofrheocastal71wtsialloy |