Effect of magnetic stirring, grain modification and refinement on the solidification structure of an A356 aluminum alloy
| Autor: | Oscar Bustos, Rodrigo Allende, R Leiva, Christian Sánchez |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Alloy General Physics and Astronomy 02 engineering and technology engineering.material 01 natural sciences Grain Refinement Physics::Fluid Dynamics Condensed Matter::Materials Science 0103 physical sciences General Materials Science Composite material Cooling curve forced convection 010302 applied physics Rotating magnetic field Rotational speed General Chemistry 021001 nanoscience & nanotechnology Grain size Forced convection Casting (metalworking) Magnet engineering solidification 0210 nano-technology Al-Si |
| Zdroj: | Matéria (Rio de Janeiro) v.26 n.1 2021 Matéria (Rio de Janeiro. Online) instacron:RLAM |
| Popis: | The effect of the application of forced convection during the continuous solidification of Al-Si alloys has been presented in this work. The investigation has been made on the hypothesis that as an alloy solidifies under the action of a rotating magnetic field, a nondendritic casting structure would be obtained. The Al-Si alloy has been studied in its three different states (original, modified, and modified with a grain refiner), using a magnetic stirring equipment with permanent magnets, a device that has allowed the study of the effect of the rotational speed (degree of stirring) on the micro- and macro- solidification structure, as well as on the material’s mechanical properties. With the purpose of validating the hypothesis, different analyses and tests have been carried out, such as thermal analysis of the solidification process, micro- and macrostructural analysis, and hardness measurements for the different process conditions studied. The results have shown that magnetic stirring affects the cooling curves, expanding the solidification range. A microstructural evolution of the alloys has also been observed, from a 100% dendritic structure to a mature rosette type structure, in addition to a notable decreasing of grain size, which results in the improvement of the material’s mechanical behavior. Keywords: Grain Refinement, forced convection, solidification, Al-Si. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|