High strength automobile bumper alloy

Details High strength automobile bumper alloy High strength automobile bumper alloy

1975-04-21

1976-03-23

Stallard, W.

Metal treatment

Compositions

Heat treating

C22F 104

Patent

active

039458610

ABSTRACT:
An improved automotive bumper or bumper back-up bar is provided in an aluminum alloy containing selected amounts of zinc and magnesium with a small amount of zirconium and copper, with small amounts of chromium and manganese being optional but preferred. Copper is included to enhance strength. The alloy can contain 5.5-9% Zn, 0.8-2% Mg, 0.11-0.25% Cu, 0.05-0.2% Zr, and preferably 0.05-0.35% Mn or 0.05-0.25% Cr, or both. The alloy products contemplated include shaped sheet and extrusion bumper products. The improved method contemplates homogenization at a controlled temperature and control of subsequent thermal exposure to, in cooperation with the homogenization, assure good performance from the standpoint of both strength and resistance to stress corrosion cracking.

REFERENCES:
patent: 2865796 (1958-12-01), Rosenkranz
patent: 3212941 (1965-10-01), O'Brien
patent: 3762916 (1973-10-01), Kirman
patent: 3850763 (1974-11-01), Zinnbauer et al.

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