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The nucleation and growth of grains in a series of Al-based alloys produced by electrolysis are observed under SEM. The atomicTi/Al ratios of the nuclei and the distribution of Ti at certain points are analyzed by point EDS. The particles in differentatomic Ti/Al ratios might act as the nuclei of α-Al. At the early stage of growth, the spherical Ti-enriched regions might formaround these particles within very limited temperature ranges in which the reactions such as the peritectic reactions etc occur.At the latter stage of growth, the dendrites freely develop in the radial orientations, and the concentration of Ti decreases
The nucleation and growth of grains in a series of Al-based alloys produced by electrolysis are observed under SEM. The atomic Ti / Al ratios of the nuclei and the distribution of Ti at certain points are analyzed by point EDS. The particles in different atomic Ti / Al ratios might act as the nuclei of α-Al. At the early stage of growth, the spherical Ti-enriched regions might formaround these particles within very limited temperature ranges in which the reactions such as the peritectic reactions etc occur. At the latter stage of growth, the dendrites freely develop in the radial orientations, and the concentration of Ti decreases