Aluminium is used in top level metallization.

Metallization is a technique used to form metal contacts and interconnects in the fabrication of ICs.

There are several ways to achieve plastic metallization. Vacuum Metallization is done by evaporating metal in a vacuum chamber which then condenses onto the base coat of the plastic part. Arc and Flame Spraying where the metallic powder is heated and melted and released in a spray. Other methods are electroless plating and elecgtroplating.

Krishna Shenai has written:

'Vlsi Metallization'

Yes, if they are programmable. No, if they are not programmable.