Magnesium alloy and casting

Abstract

A magnesium alloy containing aluminum, manganese and calcium includes 6˜12% by weight of aluminum, 0.1˜1.5% by weight of manganese, a calcium/aluminum mass ratio being 0.55˜1.0, and balance being magnesium and inevitable impurities.

1 . A magnesium alloy containing aluminum, manganese and calcium, comprising:
 6˜12% by weight of aluminum;   0.1˜1.5% by weight of manganese;   a calcium/aluminum mass ratio being 0.55˜1.0; and   balance being magnesium and inevitable impurities.   
   
   
       2 . A magnesium alloy according to  claim 1 , further comprising;
 at least one of equal to or less than 1.5% by weight of strontium, equal to or less than 2.5% by weight of rare earth element, equal to or less than 1% by weight of silicon; and   equal to or less than 2% by weight of tin.   
   
   
       3 . A magnesium alloy according to  claim 1 , wherein the calcium/aluminum mass ratio is 0.60˜0.88. 
   
   
       4 . A magnesium alloy according to  claim 1 , wherein the manganese is equal to or less than 0.2˜1.0% by weight. 
   
   
       5 . A magnesium alloy according to  claim 1 , wherein the calcium is equal to or greater than 4% by weight. 
   
   
       6 . A magnesium alloy according to  claim 1 , wherein the calcium is equal to or greater than 5% by weight. 
   
   
       7 . A magnesium alloy according to  claim 1 , wherein the magnesium alloy includes a phase (Mg 17 Al 12 ) and the β phase (Mg 17 Al 12 ) is equal to or less than 0.5% in an area ratio. 
   
   
       8 . A casting characterized in being formed from a magnesium alloy according to  claim 1 .