Real-time Observation on Coarsening of Second-Phase Droplets in Al-Bi Immiscible Alloy Using Synchrotron Radiation X-ray Imaging Technology

doi:10.1007/s40195-015-0282-0

Abstract

Abstract:

The coarsening process of second-phase droplet in solidifying Al-20 wt% Bi immiscible alloy is in situ studied using synchrotron radiation imaging technology. The collision-induced coarsening and Ostwald coarsening phenomena are directly observed and analyzed. It is found that through observation, collision-induced coarsening phenomenon occurs between droplets with little difference in radius, while Ostwald coarsening phenomenon occurs among droplets with much difference in radius. Moreover, the coarsening rate of Ostwald coarsening is much higher than that of collision-induced coarsening.

Key words: Al, alloys, Coarsening, Secondary, phase, Droplet, particles

Hui-Jun Kang, Peng Zhou, Fei Cao, Jing Zhu, Ya-Nan Fu, Wan-Xia Huang, Ti-Qiao Xiao, Tong-Min Wang. Real-time Observation on Coarsening of Second-Phase Droplets in Al-Bi Immiscible Alloy Using Synchrotron Radiation X-ray Imaging Technology[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(7): 940-945.

Figures/Tables 6

Fig. 1 Schematic diagram of experimental setup

Fig. 2 Collision-induced coarsening process of Bi-rich droplets with a field of view of 1.88 mm × 1.29 mm: a t 0, b t 0 + 267 s, c t 0 + 457 s, d t 0 + 466 s, e t 0 + 516 s, f t 0 + 635 s

Fig. 3 Ostwald coarsening process of Bi-rich droplets with a field of view of 1.21 mm × 1.29 mm: a t 0, b t 0 + 877 s, c t 0 + 925 s, d t 0 + 928 s, e t 0 + 942 s, f t 0 + 1046 s

Fig. 4 Variation of radius and motion trajectories of droplets A and B with time: a droplet radius, b motion trajectories

Fig. 5 Variation in radius and motion trajectories of droplet C with time: a droplet radius, b motion trajectories

Fig. 6 Schematic representation of two coarsening models among droplets

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