Magnesium alloy

Abstract

The present invention provides magnesium alloy which has sufficiently high strength at room temperature and high temperature. Disclosed is a magnesium alloy comprising: aluminum (Al): 14.0 to 23.0% by mass, calcium (Ca): 11.0% by mass or less (not including 0% by mass), strontium (Sr): 12.0% by mass or less (not including 0% by mass), and zinc (Zn): 0.2 to 1.0% by mass.

1 . A magnesium alloy comprising:
 aluminum (Al): 14.0 to 23.0% by mass,   calcium (Ca): 11.0% by mass or less (not including 0% by mass),   strontium (Sr): 12.0% by mass or less (not including 0% by mass), and   zinc (Zn): 0.2 to 1.0% by mass.   
     
     
         2 . The magnesium alloy according to  claim 1 , further comprising at least one selected from the group consisting of:
 silicon (Si): 0.1 to 1.5% by mass,   rare earth (RE): 0.1 to 1.2% by mass,   zirconium (Zr): 0.2 to 0.8% by mass.   scandium (Sc): 0.2 to 3.0% by mass,   yttrium (Y): 0.2 to 3.0% by mass,   tin (Sn): 0.2 to 3.0% by mass,   barium (Ba): 0.2 to 3.0% by mass, and   antimony (Sb): 0.1 to 1.5% by mass.   
     
     
         3 . The magnesium alloy according to  claim 1 , wherein a ratio of the content of strontium (Sr) to the content of calcium (Ca) is from 1:0.3 to 1:1.5 in terms of a mass ratio. 
     
     
         4 . The magnesium alloy according to  claim 1 , wherein the content of aluminum (Al), the content of calcium (Ca), and the content of strontium (Sr) satisfy a relation shown in the following equation (1):
   0.8×<Al>≦1.35×<Ca>+1.23×<Sr>+<Sr>+8.5≦1.2×<Al>  (1)
   where <Al> is the content of aluminum (Al) expressed on % by mass basis, <Ca> is the content of calcium (Ca) expressed on % by mass basis, and <Sr> is the content of strontium (Sr) expressed on % by mass basis.   
     
     
         5 . The magnesium alloy according to  claim 1 , wherein precipitates containing Al 2 Ca and Al 4 Sr are formed in the grain boundary with an interval from each other.