Immiscible Alloy Solidification: Earth vs Microgravity

Two-phase metal alloys that never fully dissolve into each other — like aluminum-indium or copper-cobalt — behave completely differently depending on where you melt them. This simulator pours the same immiscible melt into twin crucibles, one on Earth and one in orbital microgravity, and lets Stokes' law drive each droplet's motion in real time. On Earth, density-driven settling coalesces the dense phase into a bottom layer and the light phase into a top layer before the melt can freeze. In microgravity, with the settling term reduced to nearly zero, the same droplets stay finely and uniformly dispersed all the way to solidification. Tune density contrast, melt viscosity and droplet size and watch the live stratification-index readouts diverge between the two crucibles.