The Formation of Negative- And Positive-Segregated Bands During Solidification of Aluminum-Copper Alloys
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.
Q. Z. Diao and H. Tsai, "The Formation of Negative- And Positive-Segregated Bands During Solidification of Aluminum-Copper Alloys," International Journal of Heat and Mass Transfer, Elsevier, Jan 1993.
The definitive version is available at http://dx.doi.org/10.1016/0017-9310(93)90114-L
Mechanical and Aerospace Engineering
Article - Journal
© 1993 Elsevier, All rights reserved.