Process of manufacturing aluminum rivets which retain a high...

Details Process of manufacturing aluminum rivets which retain a high... Process of manufacturing aluminum rivets which retain a high...

C - Chemistry, Metallurgy

22

C

75/83, 78/9

C22C 21/12 (2006.01) C22C 21/16 (2006.01)

Patent

CA 1233677

ABSTRACT OF THE DISCLOSURE: Rivets for use in the aircraft industry are made from a wrought aluminum alloy (Material No. 3.1324 in accordance with DIN). As that alloy will precipitation- harden at room temperature, the rivets must be closed imme- diately after they have been annealed and quenched. The time in which the rivets can be deformed can be extended to as much as one week if the rivets are stored below - 17°C. In order to overcome said disadvantages in the processing of the rivets, 0.002 to 0.3% cadmium is added to the wrought aluminum alloy. The resulting modified material exhibits a delayed precipitation hardening at room temperature and even when it is fully precipitation-hardened has a very high ductility. For this reason the precipitation hardening will not impose restrictions as regards the time in which rivets made of said alloy can be closed.

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