Aluminum alloy suitable for high pressure die casting

Patent metadata

Field	Value
Publication number	US-9677158-B2
Application number	US-201313833397-A
Country	US
Kind code	B2
Filing date	Mar 15, 2013
Priority date	Mar 15, 2013
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

Copper-free aluminum alloys suitable for high pressure die casting and capable of age-hardening under elevated temperatures are provided. The allow includes about 9.5-13 wt % silicon, about 0.2 to 0.6 wt % Magnesium, about 0.1 to 2 wt % iron, about 0.1 to 2 wt % manganese, about 0.1 to 1 wt % nickel, about 0.5 to 3 wt % zinc, and 0 to 0.1 wt % strontium, with a balance of aluminum. Methods for making high pressure die castings and castings manufactured from the alloy are also provided.

First claim

What is claimed:

1. An aluminum casting alloy capable of temperature-elevated age-hardening, the alloy comprising: at least about 84 weight percent aluminum (Al); about 9.5 to about 13 weight percent silicon (Si); about 0.2 to about 0.6 weight percent magnesium (Mg); about 1 to 2 weight percent iron (Fe); and about 0.1 to 2 weight percent manganese (Mn); about 0.1 to 1 weight percent nickel (Ni); about 0.5 to 3.0 weight percent zinc (Zn); and about 0.1 weight percent [500 ppm] strontium (Sr); wherein the ratio of weight percent Mn:Fe is about 0.5 to about 3, and the total amount of Mn+Fe is from about 0.5 to about 1.5 weight percent, further
wherein the alloy is free of copper (Cu), and further wherein the alloy exhibits a eutectic phase in the range of 15-16 volume percent and solidifies at a temperature of from about 500° C. to about 650° C.

2. The alloy according to claim 1 , wherein the ratio of weight percent Mn:Fe is between about 1.0 and 2, and the total amount of Mn+Fe is from about 0.8 to about 1.2 wt %.

3. An aluminum alloy capable of age-hardening, the alloy consisting essentially of: at least about 84 to about 90 weight percent aluminum (Al); about 9.5 to about 13 weight percent silicon (Si): about 0.2 to about 0.6 weight percent magnesium (Mg); about 1.0 to about 2 weight percent iron (Fe); about 0.1 to about 2 weight percent manganese (Mn); about 0.1 to about 1 weight percent nickel (Ni); about 0.5 to about 3.0 weight percent zinc (Zn); and about 0.1 weight percent strontium (Sr);
wherein the alloy is free of copper and exhibits a eutectic phase in the range of 15-16 volume percent.

4. An aluminum alloy capable of age-hardening according to claim 3 , the alloy consisting essentially of: about 11 weight percent Si; about 0.4 weight percent Mg;
about 1.0 weight percent Fe;
about 0.8 to about 1.0 weight percent Mn,
about 0.3 weight percent Ni;
about 2.0 weight percent Zn;
about 0.1 weight percent Sr; and
a balance of Al
wherein the alloy is free of copper and exhibits a eutectic phase in the range of 15-16 volume percent.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Wang Qigui
• Yang Wenying
• Traub Jason R

Classifications

• B22D21/007

  with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C · CPC title

• B22D17/00

  Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure · CPC title

• C22C21/04 Primary

  Modified aluminium-silicon alloys · CPC title

• C22F1/043

  of alloys with silicon as the next major constituent · CPC title