Abstract
Al–Ti–C–RE master alloy has been successfully prepared by reaction of K 2TiF 6 salt, graphite powder and rare earth (RE) with Al. The microstructure of the alloy was characterized by optical microscopy, X-ray diffraction, scanning electron microscopy equipped with energy-dispersive spectrometry. The results show the microstructure of Al–Ti–C–RE alloy is composed of α-Al, lath-shaped TiAl 3, granular TiC, and blocky or rim Ti 2Al 20Ce. Compared with the Al–Ti–C master alloy, the addition of RE modifies the morphology of TiAl 3 phase, accelerates the formation of TiC. Al–Ti–C–RE alloy was used for grain refinement studies on commercial pure aluminum. An excellent grain refining performance was obtained when the addition level of Al–Ti–C–RE reaches to 0.5 wt%. The refinement mechanism of Al–Ti–C–RE has also been discussed.
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