Er strengthening aluminum alloy

Abstract

The present invention relates to Er-containing aluminum alloys with greatly improved strength properties without significant deterioration of the toughness. Specifically, the present application provides Al—Zn—Mg—Er and Al—Mg—Er series aluminum alloys and Al—Mg—Li—Zr—Er series alloys, the mechanical properties of which are improved by the addition of Er.

1 . An aluminum alloy consisting essentially of Zn, Mg, Er as the main alloying elements, and the reminder of Al.  
     
     
         2 . The aluminum alloy according to  claim 1 , wherein the Er is comprised of about 0.1˜0.7 wt %.  
     
     
         3 . The aluminum alloy according to  claim 1 , wherein the Er is comprised of about 0.25˜0.55 wt %.  
     
     
         4 . The aluminum alloy according to  claim 2 , wherein Zn is comprised of about 5.0˜7.0 Wt % and Mg is comprised of about 1.5˜2.5 Wt %.  
     
     
         5 . The aluminum alloy according to  claim 3 , wherein Zn is comprised of about 5.0˜7.0 Wt % and Mg is comprised of about 1.5˜2.5 Wt %.  
     
     
         6 . An aluminum alloy consisting essentially of Mg, Er as the main alloying elements, and the reminder of Al.  
     
     
         7 . The aluminum alloy according to  claim 6 , wherein the Er is comprised of about 0.1˜0.7 wt %.  
     
     
         8 . The aluminum alloy according to  claim 7 , wherein the Er is comprised of about 0.25˜0.55 wt %.  
     
     
         9 . The aluminum alloy according to  claim 7 , wherein Mg is comprised of about 4.0˜5.6 Wt %.  
     
     
         10 . The aluminum alloy according to  claim 8 , wherein Mg is comprised of about 4.0˜5.6 Wt %.  
     
     
         11 . An aluminum alloy consisting essentially of Li, Zr, Mg, Er as the main alloying elements, and the reminder of Al.  
     
     
         12 . The aluminum alloy according to  claim 11 , wherein the Er is comprised of about 0.05˜0.70 wt %.  
     
     
         13 . The aluminum alloy according to  claim 12 , wherein Mg is comprised of about Mg4.9˜5.5 Wt %, Li is comprised of about 1.8˜2.1 Wt % and Zr is comprised of about 0.08˜0.15 Wt %.