Al-Cu-Li-Mg alloys with very high specific mechanical strength

Details Al-Cu-Li-Mg alloys with very high specific mechanical strength Al-Cu-Li-Mg alloys with very high specific mechanical strength

1988-02-16

1989-06-20

Dean, R.

Metal treatment

Compositions

Heat treating

148159, 148417, C22F 104

Patent

active

048406830

ABSTRACT:
The invention relates to aluminum based alloys essentially containing Cu, Li and Mg, which have very high specific mechanical strength and can be used particularly to obtain heat treated articles of complex shapes. The analyses are as follows (as % by weight): Cu 2.4 to 3.5%, Li 1.9 to 2.7%; Mg from 0 to 0.8%; and up to: 0.20% Fe; 0.10% Si; 1% Mn; 0.30% Cr; 0.2% Zr; 0.1% Ti 0.02% Be preferably with the following limitation: 4.8.ltoreq.% Cu+% Li+% (Mg/2).ltoreq.6.0. In the treated state the alloys have very high specific mechanical strength (Vickers hardness/density>70), even in the absence of any plastic deformation between quench and temper, thus justifying their use inter alia for components of complex shapes such as cast or stamped parts.

REFERENCES:
patent: 4526630 (1985-07-01), Field
patent: 4603029 (1986-07-01), Quist et al.
patent: 4735774 (1988-04-01), Narayanan et al.

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