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Bingyi Zhao,Qizhou Cai,Bing Li,Jingfan Cheng 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.5
A novel grain refi ner consisting of TiC nanoparticles (NPs) supported by Ti powders (abbr. TiC/Ti refi ner) was preparedby high-energy milling. The addition of 0.5 wt% TiC/Ti refi ner converted the structure of pure Al from coarse dendrites tofi ne equiaxed grains with the average grain size of 114.7 μm, and it also increased the nucleation temperature of α(Al) from656.7 to 664.4 °C. When TiC/Ti refi ner was introduced into Al melt, the heat released from the Al–Ti reaction promoted theuniform dispersion of TiC NPs. The dissolution of the reaction product TiAl 3 released Ti atoms into the melt and thus formeda “Ti-rich transition region” around TiC NPs. The dispersive TiC NPs could act as the heterogeneous nuclei for α(Al) andthe “Ti-rich transition region” further improved the lattice orientation relationship between Al ( ̄11̄ 1 ) and TiC ( 11̄1 ) planes,which eventually resulted in the refi ning of α(Al).