I have a small collection of NiTi wire spools and "hydrolic" style devices that I got back around Y2K. I'm surprised it isn't being used more often on Mars or Moon rovers, since they are less likely to break down than more mechanical devices.

I did hear that one of the Mars rovers used NiTi to open/close a glass dust cover to measure how much dust settled on the rover over night, by comparing the photosensor results when it opened due to "noon" time heat. I don't know if that is true or not, and have no links to suggest either way. It certainly would work, though.

In any case, it's pretty fascinating stuff. Lots of fun to play with on the Raspberry Pi, too, since it takes so little electricity to cause a reaction (just enough to make it heat up, actually).