Abstract
An earlier procedure for calculating homogenization during the solidification of binary alloys is extended to include more realistic assumptions for dendrite arm coarsening kinetics and the partition coefficient. Dendrite coarsening is shown to follow the usual exponential function which differs from that relating final dendrite arm spacing λf to local solidification time. This function is not sensitive to the assumption for the partition coefficient or the choice of initial spacing (between λ0 = 0 and λf/2). The homogenization parameter H (normalized difference between the minimum possible concentration and the actual minimum concentration in the centre of the dendrite arm) changes only slightly with the partition coefficient. With the average coarsening parameter used by earlier authors, homogenization is overestimated and a lower amount of the non-equilibrium phase is obtained. The experimental data available for Al–Cu alloys in the range 2–20 wt-% Cu are very closely predicted by the numerical procedure used here.MST/435
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
