Real-time observation of grain nucleation and growth during solidification of aluminium alloys |
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| Affiliation: | 1. Warwick Manufacturing Group, The University of Warwick, Coventry CV4 7AL, UK;2. School of Engineering, RMIT University, Melbourne, VIC 3000, Australia;3. Brunel Centre for Advanced Solidification Technology, Brunel University London, Uxbridge UB8 3PH, UK;4. Tomsk State University, Tomsk 634050, Russia;5. College of Engineering, Swansea University Bay Campus, Fabian Way, Swansea SA1 8EN, UK |
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| Abstract: | The crystallisation kinetics of liquid aluminium–titanium alloys with microscopic TiB2 particles added to refine the grain size in the solidified material was studied by X-ray diffraction measurements at a synchrotron source. Real-time observation of the formation and growth of individual grains reveals the central role played by the added TiB2 particles during solidification. Prior to the main transformation, weak reflections of a metastable TiAl3 phase were detected. This observation finally pinpoints the highly debated mechanism responsible for enhanced grain nucleation in Al–Ti–B alloys. |
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