Abstract
Abstract Hypoperitectic Cu − 20 wt.% Sn alloy was solidified under different cooling rates and solidification growths using directional solidification system. The effects of cooling rate and solidification growth on the microsegregation profiles and tertiary dendritic arm spacing (λ3) were experimentally investigated along the casting. A mathematical model known as phase-field was applied to simulate microstructure and microsegregation during solidification in system Cu-Sn liquid. In this paper the applicability of the phase-field model to the solidification problem in a real alloy system was systematically explored. Microsegregation profiles and realistic dendritic structures were obtained using the phase-field model. The results calculated by phase-field model show various solidification features consistent with our experiment. The calculated tertiary dendritic arm spacing (λ3) and microsegregation profiles were compared with experimental values from directional solidification system. Since the calculated microsegregation profiles using the equilibrium partition coefficient (keq) can yielded discrepancies from the experimental results, an effective partition coefficient (kef) as a function of solidification growth, is proposed in phase-field model, showing a good agreement with the experimental data for any case examined.
Highlights
From seminal experimental studies on alloys solidification using unidirectional solidification process, dating back to the early 1980’s, a collection of experimental works has stemmed ever since, in order to investigate the microstructural growth during the solidification process[1,2,3,4,5,6,7,8,9,10,11]
The temperature profiles versus time experimentally determined during solidification are represented in Figure 3, for three specimens, which are denoted by 1, 2 and 3
In order to show the predictive capacity of phase-field model, the numerical results were compared with those obtained during solidification experiment
Summary
From seminal experimental studies on alloys solidification using unidirectional solidification process, dating back to the early 1980’s, a collection of experimental works has stemmed ever since, in order to investigate the microstructural growth during the solidification process[1,2,3,4,5,6,7,8,9,10,11]. This technique allows the study of the solid phase growth as a function of thermal variables and solidification growth, making it a very attractive technique for investigations on solidification process in alloys of eutectic or near-eutectic composition[12,13,14].
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