Abstract
The grain refining behaviour of a novel Al-Ti-Nb-B alloy in Al-Si melt with low cooling rate was in-situ observed by synchrotron radiography. Nucleation and growth of α-Al dendrites in the near-isothermal Al-8Si-7Cu melts inoculated by Al-1.67Ti-3.33Nb-0.5B and Al-5Ti-1B and were investigated. The evolution of grain number density and dendrite growth rate of α-Al were quantitatively studied, with which the significant difference in nucleation potencies between TiB2 and (Ti,Nb)B2 in Al-Si melt was understood. The superior grain refining efficacy of the Al-1.67Ti-3.33Nb-0.5B alloy owes to the sufficient amount of (Ti,Nb)B2 particles potent for both epitaxial nucleation and free growth.
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