New aluminum alloys having bismuth and/or tin

Abstract

New aluminum alloys having an improved combination of properties are disclosed. In one approach, anew aluminum alloys may include from 0.50 to 3.0 wt. % of X, wherein X comprises (wt. % Bi+wt. % Sn), from 0.50 to 4.0 wt. % Si, from 0.30 to 2.5 wt. % Mg, up to 1.5 wt. % Cu, up to 2.0 wt. % Zn, from 0.05 to 1.5 wt. % Mn, up to 0.70 wt. % Fe, up to 0.35 wt. % of Cr, up to 0.25 wt. % each of Zr and V, and up to 0.15 wt. % Ti, the balance being aluminum, incidental elements and impurities. The new aluminum alloys may comprise at least 0.20 wt. % excess silicon.

What is claimed is: 
     
         1 . An aluminum alloy comprising:
 from 0.50 to 3.0 wt. % of X, wherein X comprises (wt. % Bi+wt. % Sn);   from 0.50 to 4.0 wt. % Si;   from 0.30 to 2.5 wt. % Mg;
 wherein the aluminum alloy comprises at least 0.20 wt. % excess silicon; 
   from 0.25 to 1.5 wt. % Cu;   up to 2.0 wt. % Zn;   from 0.05 to 1.5 wt. % Mn;   up to 0.70 wt. % Fe;   up to 0.35 wt. % of Cr;   up to 0.25 wt. % each of Zr and V;   up to 0.15 wt. % Ti;   the balance being aluminum, optional incidental elements and impurities;   wherein the aluminum alloy comprises at least 1.75 mol. % of Y, wherein Y is (mol. % Q-phase+mol. % Al 2 Cu+mol. % Mg 2 Si) as calculated using PANDAT and a temperature of 340° F.   
     
     
         2 . The aluminum alloy of  claim 1 , comprising not greater than 0.4 wt. % Sn. 
     
     
         3 . The aluminum alloy of  claim 1 , comprising not greater than 0.01 wt. % Sn. 
     
     
         4 . The aluminum alloy of  claim 3 , comprising from 0.4 to 1.2 wt. % Bi. 
     
     
         5 . The aluminum alloy of  claim 1 , comprising at least 0.30 wt. % excess silicon, wherein excess silicon is calculated from the formula ((wt. % Si)−((wt. % Fe)*0.333))−((wt. % Mg)/1.73). 
     
     
         6 . The aluminum alloy of  claim 5 , comprising at least 0.70 wt. % Si. 
     
     
         7 . The aluminum alloy of  claim 6 , comprising at least 0.40 wt. % Mg. 
     
     
         8 . The aluminum alloy of  claim 7 , comprising at least 0.35 wt. % Cu. 
     
     
         9 . The aluminum alloy of  claim 8 , comprising from 0.20 to 1.0 wt. % Zn 
     
     
         10 . The aluminum alloy of  claim 9 , comprising from 0.10 to 0.5 wt. % Fe. 
     
     
         11 . The aluminum alloy of  claim 10 , comprising from 0.10 to 0.60 wt. % Mn 
     
     
         12 . The aluminum alloy of  claim 11 , comprising from 0.02 to 0.12 wt. % Ti. 
     
     
         13 . The aluminum alloy of  claim 12 , wherein strontium is included in the aluminum alloy as an impurity. 
     
     
         14 . The aluminum alloy of  claim 1 , wherein X is selected from the group consisting of Bi, Sn and mixtures thereof, and wherein indium is included in the aluminum alloy as an impurity, and wherein the aluminum alloy comprises less than 0.04 wt. % In. 
     
     
         15 . An aluminum alloy comprising:
 from 0.65 to 1.15 wt. % of X, wherein X is selected from the group consisting of Bi, Sn, In, and combinations thereof;   from 0.95 to 1.3 wt. % Si;   from 0.45 to 0.70 wt. % Mg;
 wherein the aluminum alloy comprises at least 0.30 wt. % excess silicon, wherein excess silicon is calculated from the formula ((wt. % Si)−((wt. % Fe)*0.333))−((wt. % Mg)/1.73); 
   from 1.0 to 1.4 wt. % Cu;   up to 1.0 wt. % Zn;   up to 1.5 wt. % Mn;   up to 0.70 wt. % Fe;   up to 0.35 wt. % of Cr;   up to 0.25 wt. % each of Zr and V;   up to 0.15 wt. % Ti;   the balance being aluminum, optional incidental elements and impurities;   wherein the aluminum alloy comprises at least 2.0 mol. % of Y, wherein Y is (mol. % Q-phase+mol. % Al 2 Cu+mol. % Mg 2 Si) as calculated using PANDAT and a temperature of 340° F.   
     
     
         16 . An aluminum alloy comprising:
 from 0.5 to 1.4 wt. % of X, wherein X is selected from the group consisting of Bi, Sn, In, and combinations thereof;   from 2.2 to 3.5 wt. % Si;   from 1.1 to 2.5 wt. % Mg;
 wherein the aluminum alloy comprises at least 0.50 wt. % excess silicon, wherein excess silicon is calculated from the formula ((wt. % Si)−((wt. % Fe)*0.333))−((wt. % Mg)/1.73); 
   up to 1.5 wt. % Cu;   up to 2.0 wt. % Zn;   up to 1.5 wt. % Mn;   up to 0.70 wt. % Fe;   up to 0.35 wt. % of Cr;   up to 0.25 wt. % each of Zr and V;   up to 0.15 wt. % Ti;   the balance being aluminum, optional incidental elements and impurities.