Evaluation of Microstructure and Refining Effect of Al–TiB2 and Al–5Ti–1B Grain Refiners
High-concentration Al–Ti–B master alloy was prepared by melt self-propagating high-temperature synthesis, and then the extruder bar of intermediate alloy was also prepared. The grain refiner can be divided into two categories. One is TiB2 particles only, and the other is two particulate matter containing both TiB2 and TiAl3. The microstructures of the two-grain refiners were observed under scanning electron microscope (SEM) and compared with the commercial refiners. The fining effects of the two-grain refiners were analyzed. The refining mechanism of TiAl3 and TiB2 was discussed, and the optimum dosage and the refinement scheme of pure aluminum were optimized.
KeywordsAluminum alloy Grain refiner Microstructure Refinement effect
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