Aluminum alloy composition and manufacturing method thereof

Abstract

The present disclosure provides an aluminum alloy composition and a manufacturing method thereof. By utilizing the mutually insoluble properties between tantalum and silver and sequentially adding chromium, tantalum and silver to an aluminum master alloy containing copper in plural times of melting, it avoids the eutectic reaction between chromium and silver, and required eutectic compositions are formed. Thus, the aluminum alloy composition with excellent corrosion resistance, fatigue resistance, wear resistance and high-temperature resistance is obtained. The aluminum alloy composition comprises 4.2 to 5.5 weight percent copper, 1.4 to 2.0 weight percent magnesium, 0.5 to 1.2 weight percent manganese, 0.05 to 1.0 weight percent silicon, 0.05 to 0.8 weight percent chromium, 0.01 to 0.5 weight percent tantalum, 0.01 to 0.5 weight percent silver and the balance of aluminum.

What is claimed is: 
     
         1 . An aluminum alloy composition comprising:
 4.2 to 5.5 weight percent copper, 1.4 to 2.0 weight percent magnesium, 0.5 to 1.2 weight percent manganese, 0.05 to 1.0 weight percent silicon, 0.05 to 0.8 weight percent chromium, 0.01 to 0.5 weight percent tantalum, 0.01 to 0.5 weight percent silver and the balance of aluminum.   
     
     
         2 . The aluminum alloy composition according to  claim 1 , further comprising 0.05 to 0.8 weight percent zinc. 
     
     
         3 . The aluminum alloy composition according to  claim 2 , further comprising 0.05 to 1.0 weight percent iron and 0.01 to 0.3 weight percent titanium. 
     
     
         4 . The aluminum alloy composition according to  claim 1 , wherein the aluminum alloy composition comprises an aluminum-chromium eutectic composition, wherein the aluminum-chromium eutectic composition comprises an atomic ratio aluminum/chromium of 1:2. 
     
     
         5 . The aluminum alloy composition according to  claim 1 , wherein the aluminum alloy composition comprises an aluminum-tantalum eutectic composition, wherein the aluminum-tantalum eutectic composition comprises an atomic ratio aluminum/tantalum of 3:1. 
     
     
         6 . The aluminum alloy composition according to  claim 1 , wherein the aluminum alloy composition comprises an aluminum-copper-tantalum eutectic composition, wherein the aluminum-copper-tantalum eutectic composition comprises an atomic ratio aluminum/copper/tantalum of 3:1:1 or an atomic ration aluminum/tantalum/copper of 2:1:1. 
     
     
         7 . The aluminum alloy composition according to  claim 1 , wherein the aluminum alloy composition comprises an aluminum-silver eutectic composition, wherein the aluminum-silver eutectic composition comprises an atomic ratio aluminum/silver of 1:2. 
     
     
         8 . The aluminum alloy composition according to  claim 1 , wherein the aluminum alloy composition comprises an aluminum-chromium-silver eutectic composition, wherein the aluminum-chromium-silver eutectic composition comprises an atomic ratio silver/chromium/aluminum of 2:1:1. 
     
     
         9 . A manufacturing method of an aluminum alloy composition, comprising the following steps in the sequence set forth:
 (S1) providing an aluminum master alloy, wherein the aluminum master alloy comprises aluminum and copper;   (S2) adding chromium to the aluminum master alloy and performing a first melting;   (S3) adding a tantalum-chromium alloy and performing a second melting; and   (S4) adding silver and performing a third melting to form the aluminum alloy composition.   
     
     
         10 . The manufacturing method according to  claim 9 , wherein the tantalum-chromium alloy in the step (S3) comprises an atomic ratio chromium/tantalum of 2:1. 
     
     
         11 . The manufacturing method according to  claim 9 , wherein the aluminum master alloy in the step (S1) comprises aluminum, copper, magnesium, manganese and silicon, and the aluminum alloy composition in the step (S4) comprises 4.2 to 5.5 weight percent copper, 1.4 to 2.0 weight percent magnesium, 0.5 to 1.2 weight percent manganese, 0.05 to 1.0 weight percent silicon, 0.05 to 0.8 weight percent chromium, 0.01 to 0.5 weight percent tantalum, 0.01 to 0.5 weight percent silver and the balance of aluminum. 
     
     
         12 . The manufacturing method according to  claim 11 , wherein the aluminum master alloy in the step (S1) further comprises zinc, and the aluminum alloy composition in the step (S4) further comprises 0.05 to 0.8 weight percent zinc. 
     
     
         13 . The manufacturing method according to  claim 12 , wherein the aluminum master alloy in the step (S1) further comprises iron and titanium, and the aluminum alloy composition in the step (S4) further comprises 0.05 to 1.0 weight percent iron and 0.01 to 0.3 weight percent titanium. 
     
     
         14 . The manufacturing method according to  claim 9 , wherein an aluminum-chromium eutectic composition is formed after the chromium is added to the aluminum master alloy and the first melting is performed in the step (S2), wherein the aluminum-chromium eutectic composition comprises an atomic ratio aluminum/chromium of 1:2. 
     
     
         15 . The manufacturing method according to  claim 9 , wherein an aluminum-tantalum eutectic composition is formed after the tantalum-chromium alloy is added and the second melting is performed in the step (S3), wherein the aluminum-tantalum eutectic composition comprises an atomic ratio aluminum/tantalum of 3:1. 
     
     
         16 . The manufacturing method according to  claim 9 , wherein an aluminum-copper-tantalum eutectic composition is formed after the tantalum-chromium alloy is added and the second melting is performed in the step (S3), wherein the aluminum-copper-tantalum eutectic composition comprises an atomic ratio aluminum/copper/tantalum of 3:1:1 or an atomic ration aluminum/tantalum/copper of 2:1:1. 
     
     
         17 . The manufacturing method according to  claim 9 , wherein an aluminum-silver eutectic composition is formed after the silver is added and the third melting is performed in the step (S4), wherein the aluminum-silver eutectic composition comprises an atomic ratio aluminum/silver of 1:2. 
     
     
         18 . The manufacturing method according to  claim 9 , wherein an aluminum-chromium-silver eutectic composition is formed after the silver is added and the third melting is performed in the step (S4), wherein the aluminum-chromium-silver eutectic composition comprises an atomic ratio silver/chromium/aluminum of 2:1:1.