Aluminum alloy

Abstract

The present invention relates to an aluminum alloy. The present invention provides an aluminum alloy composed of, by weight, 0.2% or less of Si, 0.2% or less of Fe, 0.6% or less of Mn, 1.5-2.1% of Mg, 5.5-6.5 of Zn, 0.1% or less of Ti, 0.1% or less of Cr, 0.1% or less of Zr, inevitable impurities, and the balance Al.

1 . An aluminum alloy composed of, by weight:
 0.2% or less of Si; 0.2% or less of Fe; 0.6% or less of Mn; 1.5˜2.1% of Mg; 5.5˜6.5% of Zn; 0.1% or less of Ti; 0.1% or less of Cr; 0.1% or less of Zr; inevitable impurities; and the balance Al.   
     
     
         2 . The aluminum alloy of  claim 1 , further comprising 0.1% or less of Cu. 
     
     
         3 . The aluminum alloy of  claim 2 , wherein the alloy is composed of equiaxed grains. 
     
     
         4 . The aluminum alloy of  claim 2 , wherein an average aspect ratio of particles of the alloy is 0.6˜1.3. 
     
     
         5 . The aluminum alloy of  claim 4 , wherein an average grain size of the particles of the alloy is 30˜500 μm. 
     
     
         6 . The aluminum alloy of  claim 1 , wherein b value is −0.5˜0.5 on 3D coordinates of Lab color system. 
     
     
         7 . The aluminum alloy of  claim 1 , wherein a ratio of a weight amount of Zn with respect to a weight amount of Mg is 3˜4.