I've been working on these for a couple months and now they're available over at ImbueFX. Its a set of videos working in UDK that show you how to create a transition material (in this case Copper to ice) and some cascade work to support it.
Take a look at https://www.youtube.com/watch?v=ttyesdZSnBM for the intro and
https://www.youtube.com/watch?v=CEWfZKad9Og&list=UUA-sP_G8gDY0V9YOOpK7V1g for the bonus chapter.
The vids will be on sale at https://www.imbuefx.com/downloads/vfx-application-series-in-udk-material-transitions/