Effects of Adding Process on Yield of Zr Element and Solidification Structure

Zr has become an indispensable trace element in the super-high strength aluminium alloy. In the present work, three Zr adding methods were adopted, that is adding aluminium zirconium master alloy, adding K2ZrF6 and adding composite zircon salt. The effects of melting temperature on the yield of Zr were studied, and the effects of different Zr element adding techniques on the existence form of Zr in aluminium alloy matrix were also researched. The results show that the yield of Zr is the highest and the grain refinement effect is the best upon adding composite zircon salt. The second phase containing Zr is coarse and the grain refinement effect is not good upon adding aluminium zirconium master alloy at 750 °C.