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The effect of Al-3Ti-0.2C-5Sr(wt%) grain refiner on the refining performance and modification of A356 alloy was investigated using optical microscope(OM).The morphology and crystal structure of ternary Al-Ti-Sr phases in Al-3Ti-0.2C-5Sr refiner were analyzed by scanning electron microscopy(SEM) and transmission electron microscopy(TEM).The results show that the ternary Al-TiSr phases in Al-3Ti-0.2C-5Sr refiner can promote the grain refining efficiency of A356 alloy.The ternary Al-Ti-Sr phases co-exist in two morphologies,i.e.,blocky-like phase and surround-like phase,besides,which both have the same chemical composition of Al_(34)Ti_3Sr.The crystal structure of Al_(34)Ti_3Sr is face-centered cubic,and the lattice parameter is determined to be about 1.52 nm.
The effect of Al-3Ti-0.2C-5Sr (wt%) grain refiner on the refining performance and modification of A356 alloy was investigated using optical microscope (OM). The morphology and crystal structure of ternary Al-Ti-Sr phases in Al -3Ti-0.2C-5Sr refiner were analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the ternary Al-TiSr phases in Al-3Ti-0.2C-5Sr refiner can promote the grain refining efficiency of A356 alloy. The ternary Al-Ti-Sr phases co-exist in two morphologies, ie, blocky-like phase and surround-like phase, except, which both have the same chemical composition of Al_ (34) Ti_3Sr.The crystal structure of Al_ (34) Ti_3Sr is face-centered cubic, and the lattice parameter is determined to be about 1.52 nm.