Heat resistant magnesium die casting alloys

Abstract

A heat resistant magnesium die casting alloy simultaneously improved in heat resistance and castability and expanded in range of application is provided. It comprises, includes, by wt %, the following composition: Al: over 6% to not more than 10 %, Ca: 1.8 to 5%, Sr: 0.05 to 1.0%, Mn: 0.1 to 0.6%, and Bal: Mg and unavoidable impurities, the ratio Ca/Al of the Ca content to the Al content being 0.3 to 0.5. To improve the corrosion resistance, 0.1 to 3% of a RE may also be added.

1 . A heat resistant magnesium die casting alloy comprising, by wt %, the following composition: 
 Al: over 6% to not more than 10%,    Ca: 1.8 to 5%,    Sr: 0.05 to 1.0%,    Mn: 0.1 to 0.6%, and    Bal: Mg and unavoidable impurities,    the ratio Ca/Al of the Ca content to the Al content being 0.3 to 0.5.    
   
   
       2 . A heat resistant magnesium die casting alloy as set forth in  claim 1 , wherein Ca: over 2% to not more than 5%.  
   
   
       3 . A heat resistant magnesium die casting alloy as set forth in  claim 1 , wherein Ca: 2.5 to 3.5%.  
   
   
       4 . A heat resistant magnesium die casting alloy as set forth in  claim 1 , further comprising a rare earth metal in an amount of 0.1 to 3 wt %.  
   
   
       5 . A die cast product comprised of a magnesium alloy as set forth in  claim 1 .  
   
   
       6 . A heat resistant magnesium die casting alloy as set forth in  claim 2 , further comprising a rare earth metal in an amount of 0.1 to 3 wt %.  
   
   
       7 . A heat resistant magnesium die casting alloy as set forth in  claim 3 , further comprising a rare earth metal in an amount of 0.1 to 3 wt %.  
   
   
       8 . A die cast product comprised of a magnesium alloy as set forth in  claim 2 .  
   
   
       9 . A die cast product comprised of a magnesium alloy as set forth in  claim 3 .  
   
   
       10 . A die cast product comprised of a magnesium alloy as set forth in  claim 4.