Magnesium alloy

Abstract

A magnesium alloy which contains magnesium as a main component and other elements added has a microstructure in which grains surrounded by high angle grain boundaries consist of subgrains and fine particles are dispersed into the subgrains.

1 - 5 . (canceled) 
     
     
         6 . A magnesium alloy having a chemical composition represented by Mg-A mass % Zn—B mass % Z (Mg: magnesium, Zn: zinc, Z: one or more elements other than Mg and Zn) and having an unavoidable impurity,
 wherein when 6≦A<10, Z is at least one element of Al, Zr, Ca, Sn, Li, Ag, and a rare earth element and 0<B<10, 
 and wherein when 0<A<6, Z is Al and 6≦B<10, 
 the magnesium alloy rolled by groove rolling with a strain at a cross-section reduction ratio of 90% or more and having high angle grain boundaries, 
 wherein grains surrounded by the high angle grain boundaries consist of subgrains into which fine particles are dispersed. 
 
     
     
         7 . The magnesium alloy according to  claim 6 , wherein the grains have an average particle diameter of 5 μm or less and the subgrains have an average particle diameter of 1.5 μm or less. 
     
     
         8 . The magnesium alloy according to  claim 7 , wherein the grains having a particle diameter of 5 μm or less possess a fraction of 70% or more. 
     
     
         9 . The magnesium alloy according to  claim 8 , wherein the fine particles have an average particle diameter of 10 nm to 1 μm. 
     
     
         10 . The magnesium alloy according to  claim 9 , wherein the amount of the fine particles in the subgrains is 15% or less with the proviso that the amount is not 0%.