So do many engine manufacturers use something else?
It's a new story to me, but high-temperature turbine production has been accelerating steadily for decades, and you'd have thought it would have been a flagged issue.
In any event, engine production for the J-20's not going to drive the exotic-metals market any time soon.
BTW, this was the only reference I could find:
https://www.washingtonpost.com/news/...=.930a6aed0857