the part on the top right is called a MAGNETRON! it is pretty corny name that dates back to the 60's. this is made of a copper core, it has aluminum heat sinks, and couple large plain magnets inside it. people often sell the magnetrons on
Ebay. The thing on the bottom is a small motor core, i believe it is made of some type of lead. The thing on the top left is a small DC motor that runs the rotating tray on the inside of the microwave. You can scrap all of them at motor price near my home. If I break the magnetron apart more, i can usually argue it as copper two, but that is only if i spend the time to tear it apart.