Liu Xiangfa

Function of modification and refinement of rapidly solidified master alloy Al—Ti—Sr

The function of modification and refinement of a master alloy Al—Ti—Sr solidified at cooling rates of 10 K s-1 or less and 103 K s-1 or greater for a hypoeutectic Al–10 wt% Si alloy has been studied. The master alloy Al–Ti–Sr solidified at a cooling rate of 103 K s-1 or greater presents a more marked function of modification and refinement than that solidified at a cooling rate of 10 K s-1 or less, both under the casting condition of a sand mould and a permanent mould. The addition amount of the master alloy is reduced by rapid solidification technology, keeping the same degree of modification and refinement.

THE EFFECT OF MAGNESIUM ON THE ANTIMONY MODIFICATION OF AL-SI

In an investigation into the effect of effectof magnesium on the antimony modification of Al−11.8Si eutectic alloy, it was found that the finer-lamella eutectic silicon in Al−11.8Si modified with 0.2% antimony became a shorter, granulated rod form with a 0.2–0.6 percent increase in magnesium. The tensile strengthand elongation of the alloy increased by 8.5 percent and 69 percetn, respectively.