I've had a Aluminum CX bike (kinesis built) have a fatigue failure in the bottom bracket cluster. That one also had the non-drive side crank have a fatigue crac

I've had a Aluminum CX bike (kinesis built) have a fatigue failure in the bottom bracket cluster. That one also had the non-drive side crank have a fatigue crack at the BB interface. I've had a (cheap) Trek steel late 80's mountain bike have a fatigue failure at the chainstay bridge. Each one had thousands of miles, but not 10k. In each case, it was probably more of a welding or detailing issue than the actual material involved.