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Semisolid casting with ultrasonically melt-treated billets of Al-7mass%Si alloys

China Foundry 2012年第1期9卷 78-83页

作者： Yoshiki Tsunekawa Masahiro Okumiya Takahiro Motomura Toyota Technological Institute

The demand for high performance cast aluminum alloy components is often disturbed by increasing impurity elements,such as iron accumulated from recycled *** is strongly required that coarse plate-like iron compound of β-Al5FeSi turns into harmless form without the need for applying refining additives or expensive virgin *** microstructural modification of Al-7mass%Si alloy billets with different iron contents was examined by applying ultrasonic vibration during the *** melt-treated billets were thixocast right after induction heating up to the semisolid temperature of 583 oC,the microstructure and tensile properties were evaluated in the thixocast *** primary α-Al is required to fill up a thin cavity in thixocasting,so that the microstructural modification by ultrasonic melt-treatment was firstly confirmed in the *** ultrasonic melt-treatment in the temperature range of 630 oC to 605 oC,the primary α-Al transforms itself from dendrite into fine globular in *** coarse plate-like β-Al5FeSi compound becomes markedly finer compared with those in non-treated *** soaking up to 583 oC,does not appreciably affect the size of β-Al5FeSi compounds;however,it affects the solid primary α-Al morphology to be more globular,which is convenient for *** thixocasting with preheated billets,eutectic silicon plates are extremely refined due to the rapid solidification arising from low casting *** tensile strength of thixocast samples with different iron contents does not change much even at 2mass% of iron,when thixocast with ultrasonically melt-treated ***,thixocast Al-7mass%Si-2mass%Fe alloy with non-treated billets exhibits an inferior strength of 80MPa,compared with 180MPa with ultrasonically melt-treated *** elongation is also improved by about a factor of two in thixocastings with ultrasonically melt-treated billets for all iron contents of Al-7mas

关键词： cast Al-Si alloy ultrasonic radiation thixocasting α-Al iron compound

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