Burned Mosfet and popped flyback diode.. help! Big DC motor PWM

And the energy stored in the inductor at switch-off is 1/2 x L x I^2 -> 13.75 joules!

That's big spike. Where will it go?

for comparison they reckon it takes 4mJ at a spark plug in an internal combustion engine to light the mixture.

regards

Allan.