Abstract
In the field of aluminum alloy processing, Al–5Ti–B master alloy stands out as the most widely used grain refiner. The morphology, distribution and quantity of the TiAl3 phase in the master alloy are critical factors influencing refining effect. In this study, Al–5Ti–B master alloy was prepared by fluoride salt reaction method. The influences of feeding temperature (700–900°C) on the preparation of Al–5Ti–B master alloy were discussed in terms of microstructure characteristics, elemental yields, grain refinement effects and master alloy hardness. The results indicated that with the increasing of feeding temperature, the size of the TiAl3 phase in the Al–5Ti–B master alloy was gradually decreased until it disappeared, with a gradual increasing of holes. The element recovery rates, refinement effects and master alloy hardness all trended downward. Furthermore, the nucleation mechanism of the TiAl3 phase was discussed. Based on the impact of feeding temperature on the morphology of the TiAl3 phase and the analysis of the diffusion movement of Ti element in the melt, coupled with thermodynamic theory, the difficulty of nucleation of the TiAl3 phase at high temperatures was explained. This study is intended to provide a reference for the control of feeding temperature during the industrial production of high-quality Al–5Ti–B master alloy.
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Acknowledgements
This work was supported by the industry-university-research Joint Innovation Project of Longyan City (No. 2022LYF18003) and the Technology Research and Industrial Application of New Aluminum Alloy Grain Refiner Related Products and Aphanitic Graphite Deep Purification. Thanks for the experiment conditions provided by Jiuding Fluorine Chemical Co., Ltd.
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XG: Manuscript writing. CZ: Format modification and review. QY, ML, FS, DY, ZL, YZ: Provision and guidance of experimental equipment. YL: Thermodynamic calculations. LH: Review. XL: Project administration.
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Geng, X., Zhang, C., Li, Y. et al. Exploration of TiAl3 Phase Nucleation Mechanism in Al–5Ti–B Master Alloy. JOM 76, 2537–2546 (2024). https://doi.org/10.1007/s11837-024-06452-2
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DOI: https://doi.org/10.1007/s11837-024-06452-2