Abstract
Such solidification variables as liquid cooling rate (VLC), average cooling rate in the solidification range (VSC), temperature gradient (G) and moving velocity of solid-liquid interface (R) were measured in Mg-2.4%Ag-1.5%RE-0.65%Zr alloy. The solidified alloy has equiaxed structures caused by a grain refining effect of Zr. The equiaxed grain size is affected so strongly by VLC that the size exponentially decreases with a rise in VLC. The amount of Mg-RE-Ag eutectic compound increases at accelerated R. The interface assumes a shape elongated from a triple junction of grain boundaries with increase of VLC or with decrease in G and increase in R. The amount of eutectic compound in the alloy decreases by T6 treatment and remains at the triple junction, though the equiaxed grain size unchanges. The compound transforms from rodlike to granular as VLC accelerates.
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