Effect of strontium and cooling rate upon eutectic temperatures of A319 aluminum alloy

DTA analysis was used to investigate the solidification reactions of alloy A319 with either 12 or 136 ppm of Sr added. Strontium does not affect primary solidification of (Al) dendrites but modifies the kinetics of the (Al)-Si eutectic. The effects of Sr level and of cooling rate on the characteristic temperatures for the (Al)-Si and other eutectic reactions are described.