A rotating disk study of impurity segregation in aluminum alloy solidification
Author(s)Buntin, Parker Bancroft.
Massachusetts Institute of Technology. Department of Materials Science and Engineering.
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The presence of impurities during the solidification of aluminum alloys can be detrimental to alloy properties and performance. As aluminum manufacturers aim to increase the amount of recycled scrap in direct-chill cast aluminum ingots, they face rising levels of impurities that threaten the quality of the aluminum alloys produced. The harmful effects of impurities are exacerbated by convection-induced macrosegregation of impurities within ingots, which leads to local regions of accumulation or depletion of impurity-containing intermetallic compounds. A small-scale rotating disk experimental approach was used to study the segregation of iron, the most common impurity in aluminum alloys, in the presence of forced convection. Applying forced convection was found to deplete iron from solidified aluminum, and evidence for the entrainment of iron within fluid flow streamlines was observed. The rotating disk system is shown to be a promising experimental approach for further research in the solidification of aluminum alloys.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Thesis: S.M., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2019Cataloged from student-submitted PDF version of thesis.Includes bibliographical references (pages 75-80).
DepartmentMassachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology
Materials Science and Engineering.