Microstructural Evolution in AlMgSi Alloys during Solidification under Electromagnetic Stirring
作者： Piotr Mikolajczak
DOI: 10.3390/MET7030089
关键词: Phase (matter) 、 Eutectic system 、 Precipitation (chemistry) 、 Equiaxed crystals 、 Forced convection 、 CALPHAD 、 Metallurgy 、 Materials science 、 Alloy 、 Dendrite (crystal)
摘要: Equiaxed solidification of AlMgSi alloys with Fe and Mn was studied by electromagnetic stirring to understand the effect forced flow. The specimens solidified a low cooling rate, temperature gradient, convection. Stirring induced coil system around caused transformation from equiaxed dendritic rosette morphology minor dendrites and, occasionally, spheroids. This evolution quantitatively observed specific surface Sv. precipitation sequence phases calculated using CALPHAD (Computer Coupling Phase Diagrams Thermochemistry) technique. Melt flow decreased secondary dendrite arm spacing λ2 in AlSi5Fe1.0 alloy, while increased slightly Mg-containing alloys. length detrimental β-Al5FeSi only alloy under stirring, whereas alloys, changes phase were negligible; however, all specimens, number density increased. modification Mn-rich phases, eutectics, Mg2Si analyzed. It found that occurrence regions reduced fluid late stages consequentially, shortening β-Al5FeSi, diminished arm-ripening convection, supported diffusive ripening. However, have not disturbed early stage solidification, rosettes unaffected.
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