Alluminum alloy that is not sensitive to quenching, as well as method for the production of a semi-finished product

Abstract

An aluminum alloy that is not sensitive to quenching, for the production of high-strength forged pieces that are low in inherent tension, and high-strength extruded and rolled products, consisting of: 7.0-10.5 wt. % zinc, 1.0-2.5 wt. % magnesium, 0.1-1.15 wt. % copper, 0.06-0.25 wt. % zirconium, 0.02-0.15 wt. % titanium, at most 0.5 wt. % manganese, at most 0.6 wt. % silver, at most 0.10 wt. % silicon, at most 0.10 wt. % iron, at most 0.04 wt. % chrome, and at least one element selected from the group consisting of: hafnium, scandium, strontium and/or vanadium with a summary content of at most 1.0 wt. %. The alloy can also contain contaminants at proportions of at most 0.05 wt. % per element and a total proportion of at most 0.15 wt. %, wherein the remaining component includes aluminum. The sum of the alloy elements zinc and magnesium and copper is at least 9 wt. %. Furthermore, there can also be a method for the production of a high-strength semi-finished product low in inherent tension from this alloy.

1 . An aluminum alloy part manufactured from an aluminum alloy that is not sensitive to quenching, the part comprising:
 a body having a cross section having a thickness of at least 50 mm wherein said body has the following chemical composition:   7.0-10.5 wt. % zinc;   0.06-0.25 wt. % zirconium;   1.0-2.5 wt. % magnesium;   0.1-1.15 wt % copper;   0.02-0.15 wt. % titanium;   at most 0.5 wt. % manganese;   at most 0.6 wt. % silver;   at most 0.10 wt. % silicon;   at most 0.10 wt. % iron;   at most 0.04 wt. % chromium;   a plurality of contaminants at proportions of at most 0.05 wt. % per element with a total contaminant proportion of at most 0.15 wt. %;   wherein a remaining amount by wt % is aluminum;   wherein a sum of the alloy elements zinc and magnesium and copper is at least 9 wt. %;   wherein the amount of zinc and magnesium is in the form of a zinc:magnesium ratio that is between 4.4 and 5.3; and   wherein the part is less sensitive to quenching than alloys AA7010, AA7050, or AA7075.   
     
     
         2 . The part according to  claim 1 , wherein the alloy further comprises one or more elements selected from the group consisting of: hafnium, scandium, strontium and/or vanadium with a summary content of at most 1.0 wt. %; 
     
     
         3 . The part according to  claim 1 , wherein the alloy further comprises 0.001-0.03 percent by weight boron; 
     
     
         4 . The part according to  claim 1 , wherein the alloy further comprises a maximum of 0.2 percent by weight cerium and a maximum of 0.30 percent by weight scandium; 
     
     
         5 . The part according to  claim 1 , wherein the alloy further comprises a maximum of 0.2 percent by weight cerium, and 
     
     
         6 . The part according to  claim 1 , wherein the alloy contains 1.6 to 1.8 wt. % magnesium and 0.8 to 1.1 wt. % copper. 
     
     
         7 . The part according to  claim 1 , wherein the alloy contains 0.8 to 1.1 wt. % copper and 0.3 to 0.5 wt. % manganese. 
     
     
         8 . The part according to  claim 1 , wherein the alloy contains 0.8 to 1.1 wt. % copper and at most 0.03 wt. % manganese. 
     
     
         9 . The part according to  claim 1 , wherein the alloy contains 0.25 to 0.40 wt. % silver. 
     
     
         10 . The part according to  claim 1 , wherein the alloy contains 0.10 to 0.15 wt. % titanium. 
     
     
         11 . The part as in  claim 1 , wherein the iron and silicon content is at most 0.08 wt. %, in each instance. 
     
     
         12 . The part as in  claim 1 , wherein said piece is not cold deformed and has a fracture toughness in a “long-transverse” direction of at least 30.5 MPA√m. 
     
     
         13 . A part configured to be formed as an airplane part that is not sensitive to quenching, having been manufactured by forging, extruding, or rolling, the part consisting essentially of:
 a body having a cross section having a thickness of at least 50 mm wherein said body has the following chemical composition:   7.0-10.5 wt. % zinc;   0.06-0.25 wt. % zirconium;   1.0-2.5 wt. % magnesium;   0.1-1.15 wt % copper;   0.02-0.15 wt. % titanium;   at most 0.5 wt. % manganese;   at most 0.6 wt. % silver;   at most 0.10 wt. % silicon;   at most 0.10 wt. % iron;   at most 0.04 wt. % chromium;   a plurality of contaminants at proportions of at most 0.05 wt. % per element with a total contaminant proportion of at most 0.15 wt. %;   wherein the remaining amount by wt % is aluminum;   wherein the sum of the alloy elements zinc and magnesium and copper is at least 9 wt. %;   wherein the amount of zinc and magnesium is in the form of a zinc:magnesium ratio that is between 4.4 and 5.3; and   wherein the part is less sensitive to quenching than alloys AA7010, AA7050, or AA7075.   
     
     
         14 . The part according to  claim 13 , wherein the alloy further comprises one or more elements selected from the group consisting of: hafnium, scandium, strontium and/or vanadium with a summary content of at most 1.0 wt. %; 
     
     
         15 . The part according to  claim 13 , wherein the alloy further comprises 0.001-0.03 percent by weight boron. 
     
     
         16 . The part according to  claim 13 , wherein the alloy further comprises a maximum of 0.2 percent by weight cerium and a maximum of 0.30 percent by weight scandium. 
     
     
         17 . The part according to  claim 13 , wherein the alloy further comprises a maximum of 0.2 percent by weight cerium, and 
     
     
         18 . The piece as in  claim 13 , wherein the part is not cold deformed and has a fracture toughness in a “long-transverse” direction of at least 30.5 MPA√m. 
     
     
         19 . The part as in  claim 13 , wherein the alloy contains 0.001 to 0.03 wt. % boron.