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The structure evolution of the ZL109 alloy in the process of semi-solid squeeze casting and the mechanical properties of the components were investigated.The results show that(1)the eutectic silicon phase in original billets is refined in the low super-heat casting process;(2) the eutectic structure in billets starts to fuse and the crystals of the eutectic silicon phase are refined further and sphericized in the remelting process of billets;(3)in the semi-solid squeeze casting process,the sphericity of theαphase and the refining of the silicon phase occur,ow- ing to the friction between solid and liquid;(4)in the process of heat treatment,the eutecticαphase aggregates with the primaryαphase and the eutectic silicon pieces aggregate together.The elongation of the semi-solid component after heat treatment rises to 1.42%.
The structure evolution of the ZL109 alloy in the process of semi-solid squeeze casting and the mechanical properties of the components were investigated. The results show that (1) the eutectic silicon phase in original billets is refined in the low super-heat casting process (2) the eutectic structure in billets starts to fuse and the crystals of the eutectic silicon phase are refined further and sphericized in the remelting process of billets; (3) in the semi-solid squeeze casting process, the sphericity of the alphaphase and the refining of the silicon phase occur, ow- ing to the friction between solid and liquid; (4) in the process of heat treatment, the eutectic alphaphase aggregates with the primary alphaphase and the eutectic silicon pieces aggregate. The elongation of the semi-solid component after heat treatment rise to 1.42%.