Conventional forging with aluminum is not very popular. But there are all kinds of casting technology out there to produce premium aluminum parts, such as:

- permanent mold casting
- die casting
- low pressure casting
- high pressure casting
- squeeze casting (slushy metal)

Sometimes the cavity is flushed with argon before casting to help eliminate porosity.

I've seen technology where they join two forgings to make a lightweight piston.

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95 E320 Cabriolet, 159K