Magnesium-based alloy

Abstract

The invention relates to a magnesium-based alloy and a semi-finished product produced therefrom with uniformly small grain size and high cold forming capability. In order to create a fine-grain billet from an ingot, the material of which is highly formable (deep-drawable) at increased temperature and at room temperature and has desirable corrosion properties, according to the invention a magnesium-based alloy (L 1, L 2 ) is provided, containing in % by weight zinc (Zn) more than 0.8, but less than 6.2, zirconium (Zr) traces, but less than 1.0, manganese (Mn) more than 0.04, but less than 0.6, calcium (Ca) more than 0.04, but less than 2.0, silicon (Si) traces, but less than 1.0, antimony (Sb) traces, but less than 0.5, silver (Ag) more than 0.1, but less than 2.0, the rest being magnesium and production-related contaminants.

1 . Fine-grain magnesium-based alloy containing in % by weight 
     
       
         
               
               
               
               
             
                   
                   
               
                   
                 Zinc (Zn) 
                 More than 0.8, 
                 but less than 6.2 
               
                   
                 Zirconium (Zr) 
                 traces, 
                 but less than 1.0 
               
                   
                 Manganese (Mn) 
                 More than 0.04, 
                 but less than 0.6 
               
                   
                 Calcium (Ca) 
                 More than 0.04, 
                 but less than 2.0 
               
                   
                 Silicon (Si) 
                 traces, 
                 but less than 1.0 
               
                   
                 Antimony (Sb) 
                 traces, 
                 but less than 0.5 
               
                   
                 Silver (Ag) 
                 More than 0.1, 
                 but less than 2.0 
               
                   
                   
               
           
              
             
             
              
              
              
              
              
              
              
              
             
          
         
       
     
     the rest being magnesium and production-related impurities. 
   
   
       2 . Magnesium-based alloy according to  claim 1  in which the microalloying
 elements Mn, Ca and Si have a total concentration   of greater than 0.1, but less than 0.65, preferably of   greater than 0.15, but less than 0.5.   
   
   
       3 . Magnesium-based alloy according to  claim 1 , in which the concentration in % by weight of one or more alloying elements is
 Zn more than 1.0, preferably more than 1.5,
 but less than 5.9, preferably less than 4.0 
   Zr less than 0.8, preferably less than 0.6   Mn more than 0.06, preferably more than 0.09   but less than 0.4, preferably less than 0.2   Ca more than 0. 1, preferably more than 0.14
 but less than 1.0, preferably less than 0.6 
   Si less than 0.5, preferably less than 0.2   Sb less than 0.25, preferably less than 0.1   Al less than 0.1, preferably less than 0.08   Ag more than 0.2, preferably more than 0.38
 but less than 1.2, preferably less than 0.9 
   
   
   
       4 . Semi-finished product of a magnesium-based alloy with a chemical composition according to  claim 1 , deformed with a press ratio of at least 1:20, which semi-finished product has a grain size of less than 10 μm and has extensive isotropy.