Abstract: In order to fabricate high-silicon aluminum alloy material, eutectic Al-12Si and hypereutectic Al-30Si alloy powders were pretreated in high temperature atmosphere oxidation, then they were canned and extruded into Al alloy materials. Oxygen analyzer, optical microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM), were used to study and compare the oxygen content and microstructure of pretreatment powders and the microstructure of materials. The results indicate that the oxygen content of the aluminum silicon alloy powders increases and the oxidation rate decreases with prolonging oxidation time. The oxygen content on powder surface is higher than that in inner particle. The oxygen content of Al-30Si powders is higher and the oxidation rate is quicker than that of Al-12Si powders in the same oxidation time. The crystal particles of alloy powders grow up in different degrees after pretreatment in high temperature atmosphere oxidation, the growth of size of Al-12Si eutectic alloy particles is not obvious, but that of Al-30Si hypereutectic alloy is very obvious.

Key words: high-silicon aluminum alloy; electronic packaging; high temperature atmosphere oxidation