Al-Mg-Si extrusion alloy and method

Details Al-Mg-Si extrusion alloy and method Al-Mg-Si extrusion alloy and method

1988-05-27

1989-08-29

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148 127A, 148159, C21D 800

Patent

active

048613894

ABSTRACT:
An extrusion ingot of an Al-Mg-Si alloy, has substantially all the Mg present in the form of particles having an average diameter of at least 0.1 microns of beta'-phase Mg.sub.2 Si in the substantial absence of beta-phase Mg.sub.2 Si. The ingot may be made by casting an ingot of the alloy, homogenising the ingot, cooling the homogenised ingot to a holding temperature of 250.degree. C. to 425.degree. C. at a cooling rate of at least 400.degree. C./h, holding the ingot for 0.25 to 3 hours, and cooling. The ingot has improved extrusion properties.

REFERENCES:
patent: 3113052 (1963-12-01), Scaneck
patent: 4256488 (1981-03-01), Livak
patent: 4412870 (1983-11-01), Vernam et al.
patent: 4659396 (1973-04-01), Lifka et al.

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