Magnesium alloy sheet

Abstract

A magnesium alloy sheet formed of a magnesium-based alloy containing, on a mass percent basis, Al: 5.0% or more and 6.5% or less, Sr: 0.2% or more and 1.0% or less, Zn: 0.1% or more and 0.75% or less, and Mn: 0.1% or more and 0.5% or less, the remainder being magnesium and incidental impurities.

1 . A magnesium alloy sheet formed of a magnesium-based alloy,
 the magnesium-based alloy comprising:   on a mass percent basis,   Al: 5.0% or more and 6.5% or less,   Sr: 0.2% or more and 1.0% or less,   Zn: 0.1% or more and 0.75% or less, and   Mn: 0.1% or more and 0.5% or less,   the remainder being magnesium and incidental impurities.   
     
     
         2 . The magnesium alloy sheet according to  claim 1 , wherein the difference between elongation after fracture in a rolling direction and elongation after fracture in a transverse direction in the magnesium alloy sheet is 2% or less. 
     
     
         3 . The magnesium alloy sheet according to  claim 1 , wherein the magnesium alloy sheet has an elongation after fracture of 18% or more. 
     
     
         4 . The magnesium alloy sheet according to  claim 1 , wherein
 Mg 17 Al 12  is dispersed on a grain boundary of the magnesium-based alloy, and   the Mg 17 Al 12  has an average grain size in the range of 10 nm or more and 30 μm or less.   
     
     
         5 . The magnesium alloy sheet according to  claim 1 , wherein an intermetallic compound containing Sr is dispersed on a grain boundary of the magnesium-based alloy. 
     
     
         6 . The magnesium alloy sheet according to  claim 1 , wherein the magnesium alloy sheet has a thickness in the range of 0.5 mm or more and 5 mm or less.