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Metals 2017, 7(9), 363; doi:10.3390/met7090363

Mushy Zone Morphology Calculation with Application of CALPHAD Technique

1
Institute of Materials Technology, Poznan University of Technology, Piotrowo 3, 60-965 Poznan, Poland
2
Department of Materials Science and Engineering, University of Alabama at Birmingham, 1720 2nd Avenue South, Birmingham, AL 35294, USA
3
Institut für Werkstoff-Forschung, German Aerospace Center DLR, Linder Höhe, 51147 Köln, Germany
*
Author to whom correspondence should be addressed.
Received: 20 July 2017 / Revised: 5 September 2017 / Accepted: 5 September 2017 / Published: 12 September 2017
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Abstract

Mushy zone morphology in AlSiMn alloys was studied using directional solidification, and the CALPHAD (Computer Coupling of Phase Diagrams and Thermochemistry) technique was applied for thermodynamic calculations. The specimens solidified with forced convection presented segregation across the sample diameter, and the measured compositions were located on the Al-Si-Mn phase diagram. Scheil-Gulliver calculations for measured compositions were used to determine various solidification paths that may occur in specimens. Property diagrams and solidification paths presented the segregation effect on the characteristic temperatures, mushy zone length and the sequence of occurring phases whilst 2D maps enabled visualization of the mushy zone during directional solidification. Melt stirring was found to change solidification range, as well as mushy zone length and shape, and the dendrite tips formed a rough profile across the specimens. The study revealed mushy zones with dense dendritic structure and liquid channels empty of Mn phases, where intermetallics had no possibility to flow in the liquid, whilst in other samples with channels filled with Al15Si2Mn4, Mn-precipitates also flowed above the α-Al. The melt flow may lead to a mainly dendritic mushy zone or to a mushy zone with dendrites reaching only lower half of mushy length with intermetallics forming and freely flowing above dendrites in the liquid upper half. View Full-Text
Keywords: aluminum alloys; mushy zone; directional solidification; CALPHAD; Mn intermetallics; Al15Si2Mn4 aluminum alloys; mushy zone; directional solidification; CALPHAD; Mn intermetallics; Al15Si2Mn4
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Mikolajczak, P.; Genau, A.; Ratke, L. Mushy Zone Morphology Calculation with Application of CALPHAD Technique. Metals 2017, 7, 363.

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