Abstract
A novel preparation technology of Al–Ti–B–C inoculant with uniform microstructure is prepared using B4C powder instead of graphite in Al–Ti melt reaction method in this study. It is found that the addition of B4C powder improves the wettability between carbon element and liquid aluminum and reduce the tendency to the gravity segregation simultaneously. The result shows that Al–Ti–B–C inoculant using B4C powder presents excellent grain refinement performance than the conventional approach. After T6 heat treatment, the ultimate tensile strength, the yield strength and elongation of A356 alloy are increased to 292 ± 6 MPa, 238 ± 7 MPa and 8.2% ± 0.5% from 260 ± 7 MPa, 218 ± 5 MPa and 4.9% ± 0.6% by addition of Al–Ti–B–C inoculant with a very small ratio of 0.3% in weight. The increase of strength in Al–Ti–B–C refined alloy is attributed to the grain refinement of primary α-Al, while the increase of ductility results from the submicron particles in Al–Ti–B–C inoculant adsorb impurity atoms as well as decreased grain size.
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