Modeling gradual solidification

Hi,

I'm trying to model the gradual solidification of cast-iron while modeling regions that are still solid, where stresses and thermal expansion still apply, and liquid regions, where the liquid can continue to flow when stress is applied to it. I've tried using a phase-change material in heat transfer with solids (I chose this one, since I also need to include the thermal stress and structural mechanics packages), but in this case, Comsol says that I need to input a Young's modulus for both the solid and liquid materials (and does not include a space for the viscosity of the liquid phase). I was wondering if this is even possible to model in Comsol. If it is, could anyone point me in the correct direction?

Thanks!

Luke