Grain refining effects of C 2 Cl 6 addition were investigated using AZ31 magnesium alloy. The addition of C 2 Cl 6 to AZ31 magnesium alloy significantly reduced the grain size from 280 μm to about 120 μm, and the tensile properties were also increased due to grain refinement. EPMA analysis showed that apparent segregation of carbon element occurred in AZ31castings treated with carbon. It was considered that the carbon might also have strong segregating power that restricts the grain growth and affects the constitutional undercooling, which in turn results in grain refining effects.
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