Materion has confirmed that it is now supplying its AMC 4632 hypereutectic aluminium-silicon alloy for use as a MotoGP piston material. Unlike its SupremEX alloys this is not an MMC, so it is legal for use in MotoGP engines.
It is manufactured using a proprietary powder metallurgy method that refines the microstructure and provides enhanced mechanical properties over the 2618 and 4032 aluminium alloys from which racing pistons are commonly forged or billet-machined. In particular, it aids in piston weight reduction and improves stability at elevated temperatures.