TitleThermodynamic Assessment of Mushy Zone in Directional Solidification
Journal titleArchives of Foundry Engineering
KeywordsAluminum alloys ; Directional solidification ; Mushy zone ; CALPHAD ; Fe intermetallics ; β-Al5FeSi
Divisions of PASNauki Techniczne
Archives of Foundry Engineering continues the publishing activity started by Foundry Commission of the Polish Academy of Sciences (PAN) in Katowice in 1978. The initiator of it was the first Chairman Professor Dr Eng. Wacław Sakwa – Corresponding Member of PAN, Honorary Doctor of Czestochowa University of Technology and Silesian University of Technology. This periodical first name was „Solidification of Metals and Alloys” , and made possible to publish the results of works achieved in the field of the Basic Problems Research Cooperation. The subject of publications was related to the title of the periodical and concerned widely understand problems of metals and alloys crystallization in a casting mold. In 1978-2000 the 44 issues have been published. Since 2001 the Foundry Commission has had patronage of the annually published “Archives of Foundry” and since 2007 quarterly published “Archives of Foundry Engineering”. Thematic scope includes scientific issues of foundry industry:
- Theoretical Aspects of Casting Processes,
- Innovative Foundry Technologies and Materials,
- Foundry Processes Computer Aiding,
- Mechanization, Automation and Robotics in Foundry,
- Transport Systems in Foundry,
- Castings Quality Management,
- Environmental Protection.
Solidification of AlSiFe alloys was studied using a directional solidification facility and the CALPHAD technique was applied to calculate
phase diagrams and to predict occurring phases. The specimens solidified by electromagnetic stirring showed segregation across, and the
measured chemical compositions were transferred into phase diagrams. The ternary phase diagrams presented different solidification paths
caused by segregation in each selected specimen. The property diagrams showed modification in the sequence and precipitation
temperature of the phases. It is proposed in the study to use thermodynamic calculations with Thermo-Calc which enables us to visualize
the mushy zone in directional solidification. 2D maps based on property diagrams show a mushy zone with a liquid channel in the
AlSi7Fe1.0 specimen center, where significant mass fraction (33%) of β-Al5FeSi phases may precipitate before α-Al dendrites form.
Otherwise liquid channel occurred almost empty of β in AlSi7Fe0.5 specimen and completely without β in AlSi9Fe0.2. The property
diagrams revealed also possible formation of α–Al8Fe2Si phases.
PublisherThe Katowice Branch of the Polish Academy of Sciences
Date2015[2015.01.01 AD - 2015.12.31 AD]
TypeArtykuły / Articles