In this paper, the effects of titanium and boron refinement treatment on microstructure changes during semi-solid remelting of ZL104 aluminum alloy were studied. The experimental results show that the elemental titanium and boron significantly refine the spherical primary α-Al grains of semi-solid ZL104 aluminum alloy, and the primary grains are fine and ideal spherical. Titanium and boron refining mechanism: Titanium and boron effectively refine the as-cast microstructure of ZL104 alloy, improve the conditions of primary grain spheroidization, and improve the roundness and uniformity of spherical grains.
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