Abstract

A356 alloy is widely used in rail transit and aerospace fields due to its excellent comprehensive properties. The refiner is called “flavor element” in aluminum industry, which plays an important role in improving the alloy microstructure and mechanical properties. In this paper, as-cast Al-3Ti-1B-1.5Ce master alloy was prepared by fluoride salt method. The optimum amount and holding time were obtained by comparing the effects of Al-3Ti-1B-1.5Ce and Al-3Ti-1B on the microstructure and properties of A356 alloy. Results showed that the average grain size in A356 alloy modified by 0.6% Al-3Ti-1B was 153.73 µm, which was much smaller than that of A356 alloy with an average grain size of 1750 µm. The introduction of Ce element caused a better refining effect of the Al-3Ti-1B-1.5Ce master alloy. When the addition of Al-3Ti-1B-1.5Ce master alloy was 0.4%, the average grain size, tensile strength and elongation reached 145.96 µm, 213.9 MPa and 11.86%, respectively.KeywordsAl-3Ti-1B-1.5Ce refinerA356 aluminum alloyGrain refinementRecession resistance

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