What's the interest in mixing mix two different alloys as partial liquid? Use the cores and chemical inhomogenities as tracers for solidification. Initial reaction is that when you increased the size of the feeders you doubled the mass flow and overloaded the heat extraction of the feed/reactor. Do the temperatures at the various points in the process and a quick heat capacity balance make sense? Up scaling has always been a problem with solidification (remembering some reocasting work from the mid 70's). At +10C all you need to do is pour the material into a container somewhat below the liquidus of the alloy to get a nondendritic structure. Various mode of agitation during subsequent solidification can produce some interesting macrograin and segregation patterns in the nondendritic matrix.
- posted 18 years ago