Title

The Formation of Negative- And Positive-Segregated Bands During Solidification of Aluminum-Copper Alloys

Abstract

The evolution of macrosegregation, appearing in the form of negative- and positive-segregated bands, in an aluminum-copper alloy unidirectionally solidified from the bottom has been analyzed numerically. It is found that a negative-segregated band is formed in the solidified casting if the casting is quenched during solidification. On the other hand, a positive-segregated band is created resulting from a sudden decrease of heat extraction rate at the bottom of the casting. Multiple negative- and positive-segregated bands could be formed in the solidified casting if the thermal boundary condition at the bottom of the casting fluctuates with time. The predicted banding segregation in the solidified alloy compares favorably with the available experimental data. © 1993.

Department(s)

Mechanical and Aerospace Engineering

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1993 Elsevier, All rights reserved.


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