# US 2009/0260725 A1 · Heat treatable L12 aluminum alloys > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2009/0260725 A1 - Document ID: US20090260725A1 - Status: Published application - Kind: A1 - Application number: 12/148,396 - Filed: 2008-04-18 - Published: 2009-10-22 - Earliest claimed: 2008-04-18 - Assignees: United Technologies Corporation - Inventors: Awadh B. Pandey - Web page: https://patentgrep.com/patent/US20090260725A1 ## CPC - C22F 1/057: of alloys with copper as the next major constituent - C22C 21/16: with magnesium - C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00) - C22C: ALLOYS (treatment of alloys C21D, C22F) ## Abstract High temperature heat treatable aluminum alloys that can be used at temperatures from about −420° F. (−251° C.) up to about 650° F. (343° C.) are described. The alloys are strengthened by dispersion of particles based on the L12 intermetallic compound Al3X. These alloys comprise aluminum, copper, magnesium, at least one of scandium, erbium, thulium, ytterbium, and lutetium; and at least one of gadolinium, yttrium, zirconium, titanium, hafnium, and niobium. Lithium is an optional alloying element. ## Claims ### Claim 1 A heat treatable aluminum alloy comprising: about 1.0 to about 8.0 weight percent copper; about 0.2 to about 4.0 weight percent magnesium; about 0.5 to about 3.0 weight percent lithium; at least one first element selected from the group consisting of about 0.1 to about 0.5 weight percent scandium, about 0.1 to about 6.0 weight percent erbium, about 0.1 to about 10.0 weight percent thulium, about 0.1 to about 15.0 weight percent ytterbium, and about 0.1 to about 12.0 weight percent lutetium; at least one second element selected from the group consisting of about 0.1 to about 4.0 weight percent gadolinium, about 0.1 to about 4.0 weight percent yttrium, about 0.05 to about 1.0 weight percent zirconium, about 0.05 to about 2.0 weight percent titanium, about 0.05 to about 2.0 weight percent hafnium, and about 0.05 to about 1.0 weight percent niobium; and the balance substantially aluminum; wherein the alloy is formed by a process selected from the group consisting of casting, deformation processing or rapid solidification processing, followed by heat treating by a solution anneal at a temperature of about 800° F. (426° C.) to about 1100° F. (593° C.) for about 30 minutes to four hours, followed by quenching, and is thereafter aged at a temperature of about 200° F. (93° C.) to about 600° F. (316° C.) for about two to forty-eight hours. ### Claim 2 (depends on 1) The alloy of claim 1, wherein the alloy comprises an aluminum solid solution matrix containing a plurality of dispersed Al3X second phases having L12 structures, wherein X includes at least one first element and at least one second element. ### Claim 3 (depends on 1) The alloy of claim 1, further comprising at least one of about 0.001 to about 0.1 weight percent sodium, about 0.001 to about 0.1 weight calcium, about 0.001 to about 0.1 weight percent strontium, about 0.001 to about 0.1 weight percent antimony, about 0.001 to about 0.1 weight percent barium, and about 0.001 to about 0.1 weight percent phosphorus. ### Claim 4 (depends on 1) The alloy of claim 1, comprising no more than about 1.0 weight percent total other additional elements not listed therein including impurities. ### Claim 5 (depends on 1) The alloy of claim 1, comprising no more than about 0.1 weight percent iron, about 0.1 weight percent chromium, about 0.1 weight percent manganese, about 0.1 weight percent vanadium, about 0.1 weight percent cobalt, and about 0.1 weight percent nickel. ### Claim at position 6 6-11. (canceled) ### Claim 12 (depends on 1) The heat treatable aluminum alloy of claim 1, wherein the alloy is capable of being used at temperatures from about −420° F. (−251° C.) up to about 650° F. (343° C.). ### Claim 13 A heat treatable aluminum alloy comprising: about 1.0 to about 8.0 weight percent copper; about 0.2 to about 4.0 weight percent magnesium; about 0.5 to about 3.0 weight percent lithium; an aluminum solid solution matrix containing a plurality of dispersed Al3X second phases having L12 structures where X comprises at least one of scandium, erbium, thulium, ytterbium and lutetium, and at least one of gadolinium, yttrium, zirconium, titanium, hafnium and niobium; the balance substantially aluminum; wherein the alloy is formed by a process selected from the group consisting of casting, deformation processing or rapid solidification processing, followed by heat treating by a solution anneal at a temperature of about 800° F. (426° C.) to about 1100° F. (593° C.) for about 30 minutes to four hours, followed by quenching, and is thereafter aged at a temperature of about 200° F. (93° C.) to about 600° F. (316° C.) for about two to forty-eight hours. ### Claim 14 (depends on 13) The alloy of claim 13, wherein the alloy comprises at least one of: about 0.1 to about 0.5 weight percent scandium, about 0.1 to about 6.0 weight percent erbium, about 0.1 to about 10.0 weight percent thulium, about 0.1 to about 15.0 weight percent ytterbium, about 0.1 to about 12.0 weight percent lutetium, about 0.1 to about 4.0 weight percent gadolinium, about 0.1 to about 4.0 weight percent yttrium, about 0.05 to about 1.0 weight percent zirconium, about 0.05 to about 2.0 weight percent titanium, about 0.05 to about 2.0 weight percent hafnium, and about 0.05 to about 1.0 weight percent niobium. ### Claim at position 10 15-19. (canceled) ### Claim 20 (depends on 1) The alloy of claim 1, further comprising at least one of about 0.001 to about 0.1 weight percent sodium, about 0.001 to about 0.1 weight calcium, about 0.001 to about 0.1 weight percent strontium, about 0.001 to about 0.1 weight percent antimony, about 0.001 to about 0.1 weight percent barium, and about 0.001 to about 0.1 weight percent phosphorus. ### Claim 21 (depends on 13) The alloy of claim 13, comprising no more than about 1.0 weight percent total other additional elements not listed therein including impurities. ### Claim 22 (depends on 21) The alloy of claim 21, comprising no more than about 0.1 weight percent iron, about weight percent chromium, about 0.1 weight percent manganese, about 0.1 weight percent vanadium, about 0.1 weight percent cobalt, and about 0.1 weight percent nickel.