http://en.wikipedia.org/wiki/Hypereutectic_piston
-- Thanks,
Brent Hasty

Brent,
These compounds often have to be forced to happen. Most of the
pistons formed using these alloys are forged. Cosworth was an early user
or may have worked with the metalurgists to produce it. The result
was a tough forged piston with a lower controlled expansion rate.

Bill Jepson

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