Method of making aluminum rivets with high ductility retention

Details Method of making aluminum rivets with high ductility retention Method of making aluminum rivets with high ductility retention

1984-08-09

1986-11-04

Dean, R.

Metal treatment

Stock

Aluminum base

148 115A, 148127, 420534, 420535, 420536, C22C 2100

Patent

active

046208860

ABSTRACT:
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 immediately 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.degree. 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.

REFERENCES:
patent: 2301759 (1942-11-01), Stroup

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