Heat-resistant aluminum alloy and method for manufacturing the same

Abstract

Disclosed is a heat-resistant aluminum alloy including aluminum and two types of alloy elements which are combined while forming a homogeneous solid solution reinforcing phase. The disclosed heat-resistant aluminum alloy includes the alloy elements that form a homogeneous solid solution and do not have a solvus line with respect to aluminum as a matrix metal and, therefore, the formed homogeneous solid solution reinforcing phase does not react with aluminum even at a temperature up to 300° C., thus not becoming coarse or undergoing phase decomposition. Consequently, the disclosed aluminum alloy may have remarkably enhanced heat resistance.

1 . A heat-resistant aluminum alloy, comprising aluminum and two types of alloy elements which form a homogeneous solid solution and are combined to form a homogeneous solid solution reinforcing phase. 
     
     
         2 . The alloy according to  claim 1 , wherein the alloy elements are contained in an amount of 0.5 to 10 wt. % relative to aluminum. 
     
     
         3 . The alloy according to  claim 2 , wherein, one of the two alloy elements is contained in an amount of 10 to 90 wt. % while the other is contained in an amount of 90 to 10 wt. %. 
     
     
         4 . The alloy according to  claim 3 , wherein the two alloy elements are chromium (Cr) and tungsten (W). 
     
     
         5 . The alloy according to  claim 4 , wherein, in the case where the homogeneous solid solution reinforcing phase is composed of Cr and W, it maintains a stable single phase at a temperature up to 1800° C. and has a size of 1 to 200 μm. 
     
     
         6 . The alloy according to  claim 3 , wherein the two alloy elements are copper (Cu) and nickel (Ni). 
     
     
         7 . The alloy according to  claim 6 , wherein, in the case where the homogeneous solid solution reinforcing phase is composed of Cu and Ni, it is stable at a temperature up to 873° C. and has a crystal interface shape with a size of 1 to 50 μm. 
     
     
         8 . The alloy according to  claim 3 , wherein the two alloy elements are iron (Fe) and chromium (Cr). 
     
     
         9 . The alloy according to  claim 8 , wherein, in the case where the homogeneous solid solution reinforcing phase is composed of Fe and Cr, it maintains a stable single phase at a temperature up to 1500° C. and has a facet shape with a size of 1 to 60 μm. 
     
     
         10 . The alloy according to  claim 3 , wherein the two alloy elements are iron (Fe) and manganese (Mn). 
     
     
         11 . The alloy according to  claim 10 , wherein the homogeneous solid solution reinforcing phase has heat resistance at a temperature up to 1245° C. and is formed in a facet shape having a size of 1 to 50 μm. 
     
     
         12 . The alloy according to  claim 3 , wherein the two alloy elements are manganese (Mn) and vanadium (V). 
     
     
         13 . The alloy according to  claim 12 , wherein the homogeneous solid solution reinforcing phase maintains a stable single phase at a temperature up to 1245° C. and has a facet shape with a size of 1 to 100 μm. 
     
     
         14 . The alloy according to  claim 3 , wherein the two alloy elements are cobalt (Co) and nickel (Ni). 
     
     
         15 . The alloy according to  claim 14 , wherein the homogeneous solid solution reinforcing phase has heat resistance at a temperature up to 1490° C. and is formed in a needle-like shape having a size of 1 to 70 μm. 
     
     
         16 . The alloy according to  claim 3 , wherein the two alloy elements are iron (Fe) and nickel (Ni). 
     
     
         17 . The alloy according to  claim 16 , wherein the homogeneous solid solution reinforcing phase maintains a stable single phase at a temperature up to 1245° C. and has a granular shape with a size of 1 to 30 μm. 
     
     
         18 . The alloy according to  claim 3 , wherein the two alloy elements are copper (Cu) and manganese (Mn). 
     
     
         19 . The alloy according to  claim 18 , wherein the homogeneous solid solution reinforcing phase maintains a stable single phase at a temperature up to 873° C. and has a size of 1 to 10 μm. 
     
     
         20 . A method for manufacturing a heat-resistant aluminum alloy, comprising; adding alloy elements to an aluminum melt composed of molten aluminum, and casting the melt after the alloy elements are fused. 
     
     
         21 . The method according to  claim 20 , wherein the alloy elements are Cr and W, which are directly added to the melt or, otherwise, added as a Cr—W master alloy or both of aluminum-Cr master alloy and aluminum-W master alloy to the melt. 
     
     
         22 . The method according to  claim 20 , wherein the alloy elements are Cu and Ni, which are directly added to the melt or, otherwise, added as a Cu—Ni master alloy or both of aluminum-Cu master alloy and aluminum-Ni master alloy to the melt. 
     
     
         23 . The method according to  claim 20 , wherein the alloy elements are Fe and Cr, which are directly added to the melt or, otherwise, added as an Fe—Cr master alloy or both of aluminum-Fe master alloy and aluminum-Cr master alloy to the melt. 
     
     
         24 . The method according to  claim 20 , wherein the alloy elements are Fe and Mn, which are directly added to the melt or, otherwise, added as an Fe—Mn master alloy or both of aluminum-Fe master alloy and aluminum-Mn master alloy to the melt. 
     
     
         25 . The method according to  claim 20 , wherein the alloy elements are Mn and V, which are directly added to the melt or, otherwise, added as an Mn—V master alloy or both of aluminum-Mn master alloy and aluminum-V master alloy to the melt. 
     
     
         26 . The method according to  claim 20 , wherein the alloy elements are Co and Ni, which are directly added to the melt or, otherwise, added as a Co—Ni master alloy or both of aluminum-Co master alloy and aluminum-Ni master alloy to the melt. 
     
     
         27 . The method according to  claim 20 , wherein the alloy elements are Fe and Ni, which are directly added to the melt or, otherwise, added as an Fe—Ni master alloy or both of aluminum-Fe master alloy and aluminum-Ni master alloy to the melt. 
     
     
         28 . The method according to  claim 20 , wherein the alloy elements are Cu and Mn, which are directly added to the melt or, otherwise, added as a Cu—Mn master alloy or both of aluminum-Cu master alloy and aluminum-Mn master alloy to the melt. 
     
     
         29 . The method according to  claim 20 , wherein the alloy elements are added in an amount of 0.5 to 10 wt. % relative to aluminum.