Al-Mg-Si extrusion alloy

Details Al-Mg-Si extrusion alloy Al-Mg-Si extrusion alloy

1992-06-23

1993-06-29

Wyszomierski, George

Metal treatment

Stock

Age or precipitation hardened or strengthened

148417, 148439, 148440, 420534, 420546, C22C 2104, C22C 2108

Patent

active

052230503

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 bet-phase Mg.sub.2 Si. The ingot may be made by casting an ingot of the alloy, homogenizing the ingot, cooling the homogenized 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:
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Shibata, K. et al, "Effect of Precipitation Heat Treatment on Extrudability of Ingots of 6063 Alloy," Sumitomo Light Metal Technical Report, v. 26, pp. 327-335, 1976.
Chemical Abstracts vol. 75, No. 10, Sep. 6, 1971, p. 303, abstract No. 68335s.
Scharf (I), G., et al., "Das Auftreten von Magnesiumsilizidausscheidungen in Strangpressprofilen aus AlMgSiO.5 auf Basis Al 99.9", Metall. 20 (1966) v. 3, pp. 203-209 (and translation).
Scharf (II), G., et al., "Verbesserte Giesstechnik fur Rundbarren aus AlMgSiO.5 und Einfluss des Gussgefuges auf die Pressbarkeit", Metall. 32 (1978), v. 6, pp. 555.560 (and translation).
Westengen, H., et al., "Precipitation Reactions in an Aluminium 1 wt. % Mg.sub.2 Si Alloy", Z. Metallkunde., 70 (1979), v. 8, 99. 528-535.

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