Purification Effects of C2Cl6 on A00 Aluminum

The effects of several fluxes on purification, microstructures and properties of A00 aluminum have been studied. The experimental results and analyses indicate that many cracks and large porosities exist in the surface film above the melt purified by C2C16 and that the film is floc and mostly composed of Al2O3 and pure aluminum, which carries many carbon particles and AlCl3 not fully volatilized. And then over 50% （mass fraction） of the all-melting residue is pure aluminum, which is one of the major reasons for high melting loss. Moreover, because of a mass of gas bubbles and a state of seethe, there are many inclusions which size is under 10 ~tm in the microstructure of A00 aluminum purified with C2C16 or fluxes containing C2C16. With this purifying method, the aluminum crystal grains are extended along the radius that was observed firstly and the average crystal size of A00 aluminum are about 100-150μm. In addition, small size inclusions have little affected on tensile strength and micro inclusions under 10μm have little affected on elongation.