IMPACT OF INITIAL MICROSTRUCTURE ON THE CARTRIDGE CASE EARRING OF ALUMINIUM ALLOYS

• Ahmad

  English

  Author

• Aamir H. Bhatia

  English

  Author

Investigations were conducted into defects discovered during the impact extrusion of EN AW-5754 aluminum alloy during
the manufacturing of cartridge cases. There was a noticeable propensity to earring after impact extrusion in cartridge
casings made from a single metallurgical heat. The earring in cartridge casings from the opposite heat, however, was not
seen. The local variation in material flow during extrusion is what causes the presence of the earring. The variation in
second phase particle distribution in utilized preforms (slugs) is the cause of this behavior.

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