Heterogeneous Nucleation for AZ91 with In Situ Synthesis Al4C3
Heterogeneous nucleation is a critical factor for grain refinement magnesium alloys. The paper reports the Al-9wt.%Mg-10wt.%SiCp master alloy were prepared by adding SiCp into the Al-Mg molten with stirring in 610-595°C, which were introduced into AZ91. Experimental results indicated Al4C3 were in situ synthesis on the surface of SiCp by the reaction between SiCp and Al in 850°C, which could be as nucleant substrate for primary Mg during the solildification of magnesium alloys. This investigation provided a novel idea for grain refinement Mg-Al alloy.
Zhengyi Jiang and Chunliang Zhang
X. Q. Luo et al., "Heterogeneous Nucleation for AZ91 with In Situ Synthesis Al4C3", Advanced Materials Research, Vols. 97-101, pp. 1069-1072, 2010