 Die casting is a metal casting process that is characterized by forcing molten metal under high pressure into a mold cavity . The mold cavity is created using two hardened tool steel dies which have been machined into shape and work similarly to an injection mold during the process . Most die castings are made from non @-@ ferrous metals , specifically zinc , copper , aluminium , magnesium , lead , pewter and tin @-@ based alloys . Depending on the type of metal being cast , a <unk> or cold @-@ chamber machine is used . 
