Neodymium-iron-boron magnet thermal failure in electric vehicles

Tom's two Chevy Bolts use Dy-Fe magnets (180°F tolerance) rather than Nd-Fe-B (140°F). Military interest for nuclear-reactor-powered ships.

I have two all-electric vehicles, Chevy Bolts. They don't use neodymium iron in the electric motors in my car. Anybody know what they use? Dysprosium iron. Why? Because neodymium iron starts to lose its great magnetic properties at 140 degrees Fahrenheit. Dysprosium iron will go to 180. When someone's gunning that car they're liable to get it hot, particularly if you're in Arizona, and then all of a sudden you lose your power if you go above the transformation. Who else is interested in dysprosium iron? The US military. They have a number of applications such as nuclear reactors powering ships that would like that extra forty degrees of safety margin. So there's all kinds of things that follow on from these different things.