Aluminum alloy extruded material and electronic device housing comprising same

Abstract

An aluminum alloy extruded material and an electronic device housing including the same are provided. The aluminum alloy extruded material includes aluminum, zinc, magnesium, and copper, and the amount of copper and the amount of zinc have a correlation.

What is claimed is: 
     
         1 . An aluminum alloy extruded material comprising:
 aluminum (Al);   zinc (Zn);   magnesium (Mg); and   copper (Cu),   wherein an amount of copper (Cu) and an amount of zinc (Zn) satisfy Equation 1 below,
   [Cu]≥0.14[Zn]−0.782, and
 
   wherein [Cu] corresponds to an amount (% by weight (wt %)) of copper (Cu), and [Zn] corresponds to an amount (wt %) of zinc (Zn).   
     
     
         2 . The aluminum alloy extruded material of  claim 1 ,
 wherein the amount of zinc (Zn) and an amount of magnesium (Mg) satisfy Equation 2 below,   
       
         
           
             
               
                 2 
                 ≤ 
                 
                   
                     [ 
                     Zn 
                     ] 
                   
                   
                     [ 
                     Mg 
                     ] 
                   
                 
                 ≤ 
                 4 
               
               , 
             
           
         
       
       and
 wherein [Zn] corresponds to the amount (wt %) of zinc (Zn), and [Mg] corresponds to an amount (wt %) of magnesium (Mg). 
 
     
     
         3 . The aluminum alloy extruded material of  claim 1 , further comprising:
 an intermetallic compound including Zn 2 Mg,   wherein the intermetallic compound has a diameter of 10 micrometers (μm) or less.   
     
     
         4 . The aluminum alloy extruded material of  claim 1 ,
 wherein the aluminum alloy extruded material comprises crystal grains having an average particle diameter of 100 micrometers (μm) to 300 μm, and   wherein a potential difference at an interface between at least two adjacent crystal grains is in a range of 30 millivolts (mV) to 100 mV.   
     
     
         5 . The aluminum alloy extruded material of  claim 1 ,
 wherein the zinc (Zn) is present in an amount of 5.85 wt % to 8.0 wt %, and   wherein the magnesium (Mg) is present in an amount of 2.0 wt % to 2.9 wt %.   
     
     
         6 . The aluminum alloy extruded material of  claim 1 , wherein the copper (Cu) is present in an amount of 0.03 wt % to 0.50 wt %. 
     
     
         7 . The aluminum alloy extruded material of  claim 1 ,
 wherein the amount of copper (Cu) and the amount of zinc (Zn) satisfy Equation 3 below,   
       
         
           
             
               
                 0.003 
                 ≤ 
                 
                   
                     [ 
                     Cu 
                     ] 
                   
                   
                     [ 
                     Zn 
                     ] 
                   
                 
                 ≤ 
                 0.375 
               
               , 
             
           
         
       
       and
 wherein [Cu] corresponds to the amount (wt %) of copper (Cu), and [Zn] corresponds to the amount (wt %) of zinc (Zn). 
 
     
     
         8 . The aluminum alloy extruded material of  claim 1 , wherein the amount of copper (Cu) and the amount of zinc (Zn) satisfy Equation 4 below, 
       
         
           
             
               
                 
                   
                     [ 
                     Cu 
                     ] 
                   
                   
                     [ 
                     Zn 
                     ] 
                   
                 
                 ≥ 
                 
                   0.14 
                   - 
                   
                     0.782 
                     
                       [ 
                       Zn 
                       ] 
                     
                   
                 
               
               , 
             
           
         
         wherein [Cu] corresponds to the amount (wt %) of copper (Cu), and [Zn] corresponds to the amount (wt %) of zinc (Zn). 
       
     
     
         9 . The aluminum alloy extruded material of  claim 1 , further comprising:
 manganese (Mn);   silicon (Si);   iron (Fe);   titanium (Ti);   zirconium (Zr); and   chromium (Cr),   wherein the manganese (Mn) is present in an amount of 0.1 wt % to 0.3 wt %,   wherein the silicon (Si) is present in an amount of 0.01 wt % to 0.1 wt %,   wherein the iron (Fe) is present in an amount of 0.01% to 0.15 wt %,   wherein the titanium (Ti) is present in an amount of 0.005 wt % to 0.03 wt %,   wherein the zirconium (Zr) is present in an amount of 0.005 wt % to 0.03 wt %, and   wherein the chromium (Cr) is present in an amount of 0.0001 wt % to 0.03 wt %.   
     
     
         10 . The aluminum alloy extruded material of  claim 1 , further comprising:
 manganese (Mn);   silicon (Si);   iron (Fe);   titanium (Ti);   zirconium (Zr); and   chromium (Cr),   wherein the zinc (Zn) is present in an amount of 5.85 wt % to 8.0 wt %,   wherein the magnesium (Mg) is present in an amount of 2.0 wt % to 2.9 wt %,   wherein the copper (Cu) is present in an amount of 0.03 wt % to 0.50 wt %,   wherein the manganese (Mn) is present in an amount of 0.1 wt % to 0.3 wt %,   wherein the silicon (Si) is present in an amount of 0.01 wt % to 0.1 wt %,   wherein the iron (Fe) is present in an amount of 0.01% to 0.15 wt %,   wherein the titanium (Ti) is present in an amount of 0.005 wt % to 0.03 wt %,   wherein the zirconium (Zr) is present in an amount of 0.005 wt % to 0.03 wt %,   wherein the chromium (Cr) is present in an amount of 0.0001 wt % to 0.03 wt %, and   wherein the aluminum (Al) accounts for a remainder of the aluminum alloy extruded material.   
     
     
         11 . The aluminum alloy extruded material of  claim 1 , wherein the aluminum alloy extruded material has a yield strength of 450 megapascals (MPa) or greater. 
     
     
         12 . The aluminum alloy extruded material of  claim 1 , wherein the aluminum alloy extruded material has a surface hardness of 150 Vickers hardness (Hv) or greater. 
     
     
         13 . The aluminum alloy extruded material of  claim 1 , wherein the aluminum alloy extruded material has a surface gloss of 300 gloss units (GU) or greater measured according to International Organization for Standardization (ISO)  2813 . 
     
     
         14 . An electronic device housing comprising the aluminum alloy extruded material of  claim 1 .