Microstructure Evolution Characteristics during Rapid Solidification of Ca-Mg Alloys with Different Mg Contents

The molecular dynamics simulation studies on the microstructure evolution properties of liquid Ca-Mg alloys during the rapid solidifications have been performed. The simulated structure factor S(q) of Ca7Mg3 is well agreed with the experimental data. Results indicate that the glass transition temperatures of CaMg2 and Ca7Mg3 are 590 K and 550 K respectively with the cooling rate of 1 x 10(12) K/s. It also found that icosahedron is much easier to form in CaMg2 system, and Ca-Mg alloys with more Mg content indicate higher glass forming ability.