Not at my swing speed.
Oh yea, I've seen a pretty substantial spark before with my driver if I end up drop kicking it a bit, or brushing the ground. You can even get it to happen with sandy conditions. Like if they just reseeded a divot, and it has a bit of sand to it. Something pretty grainy, you can get a spark to happen.
Have often seen some sparks off buddy's clubs if we are playing near dusk. That was probably from the titanium in the ball cover (titanium dioxide for whiteness). The big question of course is whether a club staring on fire is considered damaged "in the normal course of play"?
Nah. Titanium dioxide is not flammable and will not have the same affect. We have used it at work. Even a steel head can create a spark off certain types of rock. The article talks about the heat created from a titanium club head being hot enough to ignite brush.
I've known this since 1995 when I had a generation1 Cobra Ti driver. You don't even need to hit a rock!! I remember brushing dry firm turf on a practice swing and causing sparks!!
With that said, I don't recall ever making sparks brushing the ground since the 1990s and I haven't seen this with any drivers since.