Abstract
The effect of cooling rate on grain refining behavior of Mg-4Y-3Nd-1.5Al alloy was carried out by optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and x-ray diffraction (XRD) analysis. The different cooling rates were obtained by using step-sample method. The experimental results show that the grain size of Mg-4Y-3Nd-1.5Al alloy decreases with increasing cooling rate. The volume fraction of eutectic phases increases with increasing cooling rate. The Al2RE particles are effective heterogeneous nucleation sites as α-Mg. The refining effect on Mg-4Y-3Nd-1.5Al alloy is affected by the number and size of Al2RE particles. The number of increases and the average particle size of Al2RE phase decreases with increasing cooling rate.
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