|
I.Steinbach, B.Böttger, J.Eiken
A statistical approach to nucleation, using a temperature distribution function for nucleation on heterogeneous nucleation sites, is combined with phase field simulation of equiaxed crystal growth in a Mg alloy controlled by solute diffusion. The temperature evolution of the system is calculated from a heat balance between release of latent heat and external heat extraction. Thus the effect of inoculation by adding grain refiners, the effect of alloy composition on growth and release of latent heat and finally the effect of external cooling on the final grain density can be studied. The presentation focuses on the interrelation between nucleation density and grain morphology, that can be used to identify the leading mechanism of grain refinement. |
|