Aluminium based alloy with a high Young's modulus and high mecha

Details Aluminium based alloy with a high Young's modulus and high mecha Aluminium based alloy with a high Young's modulus and high mecha

1990-04-04

1991-09-10

Upendra, Roy

Metal treatment

Compositions

Heat treating

148 127A, 420532, 428659, C22C 2110

Patent

active

050470922

ABSTRACT:
The invention concerns aluminum based alloys of the 7000 series with a high Young'3 s modulus (E.gtoreq.74 GPa), high mechanical strength (R.sub.0.2 .gtoreq.530 MPa in the longitudinal direction), good tenacity (KIC, longitudinal direction .gtoreq.20 MPa.sqroot.m ), and good resistance to corrosion under tension (.sigma..gtoreq.250 MPa in the short transverse direction, durability .gtoreq.30 days ASTM standard G 38-73. The alloy according to the invention is of the following composition by weight: from 5.5 to 8.45% of Zr; from 2 to 3.5% Mg; from 0.5 to 2.5% up to 0.5% Fe; up to 0.5% Si; other elements .ltoreq.0.05% each; and up to 0.15% in all with 0.1.ltoreq.Zr.ltoreq.0.5% 0.3.ltoreq.Cr.ltoreq.0.6%; and 0.3.ltoreq.Mn.ltoreq.1.1%. It is preferably worked by the following process steps: a solid body of the composition claimed above is formed by spray deposition; the body is converted to a worked product, at from 300.degree. to 450.degree. C., the optionally converted cold; and the worked product undergoes heat treatment comprising dissolution, quenching and annealing in a T6 or T7 state.

REFERENCES:
patent: 3563814 (1971-02-01), Lyle et al.
patent: 3791876 (1974-02-01), Kroger
patent: 4462843 (1984-07-01), Baba et al.
patent: 4711762 (1987-12-01), Vernam et al.
patent: 4747890 (1988-05-01), Meyer
patent: 4830826 (1989-05-01), Ichiro
patent: 4874578 (1989-10-01), Homberger et al.

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