Formable, high strength aluminium-magnesium alloy material for application in welded structures

Abstract

Aluminium-magnesium alloy in the form of a rolled product or an extrusion, having the following composition in weight percent: Mg >3.0-4.5 Mn   0.4-1.2 Zn   0.4-1.7 Zr   0.05-0.25 Cr   0.3 max. Ti   0.2 max. V   0.2 max. Li   0.5 max. Sc   0.5 max. Fe   0.5 max. Si   0.5 max. Cu   0.15 max. Ag   0.4 max. others (each) max. 0.05 (total) max. 0.15 balance aluminium.

1 . Aluminium-magnesium alloy in the form of a rolled product or an extrusion, having the following composition in weight percent.  
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                     
                 
                     
                   Mg 
                   >3.0-4.5 
                 
                     
                   Mn 
                     0.4-1.2 
                 
                     
                   Zn 
                     0.4-1.7 
                 
                     
                   Zr 
                     0.05-0.25 
                 
                     
                   Cr 
                   0.3 max. 
                 
                     
                   Ti 
                   0.2 max. 
                 
                     
                   V 
                   0.2 max. 
                 
                     
                   Li 
                   0.5 max. 
                 
                     
                   Sc 
                   0.5 max. 
                 
                     
                   Fe 
                   0.5 max. 
                 
                     
                   Si 
                   0.5 max. 
                 
                     
                   Cu 
                   0.15 max. 
                 
                     
                   Ag 
                   0.4 max. 
                 
                     
                   others 
                   (each) max. 0.05 
                 
                     
                     
                   (total) max. 0.15 
                 
                 
                 
               
                     
                   balance Aluminium. 
                 
                     
                     
                 
                     
                     
                 
             
                
                
               
               
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
             
                
                
                
               
            
           
         
       
     
     
         2 . Aluminium-magnesium alloy according to  claim 1  having a temper selected from a soft temper, a work-hardened temper, a natural aged temper and an artificial aged temper.  
     
     
         3 . Aluminium-magnesium alloy according to  claim 1  or  2  wherein the Zn content is in the range 0.4 to 1.2 wt %.  
     
     
         4 . Aluminium-magnesium alloy according to  claim 3 , wherein the Zn content is in the range of 0.4 to 0.9 wt %.  
     
     
         5 . Aluminium-magnesium alloy according to any one of  claims 1  to  4 , wherein the Mg content is in the range 3.5 to 4.5 wt %.  
     
     
         6 . Aluminium-magnesium alloy according to any one of  claims 1  to  5 , wherein the Cu content is in the range of 0.1 wt % max.  
     
     
         7 . Aluminium-magnesium alloy according to any one of  claims 1  to  6 , wherein the Mn content is in the range of 0.4 to 0.75%.  
     
     
         8 . Aluminium-magnesium alloy according to any one of  claims 1  to  7 , wherein the Fe/Mn ratio is in a range of 0.3 to 1.0.  
     
     
         9 . Welded structure comprising at least one welded plate or extrusion made of aluminium-magnesium alloy according to any one of  claims 1  to  8 .  
     
     
         10 . Welded structure according to  claim 9  wherein the proof strength of the weld of said plate or extrusion is at least 110 MPa.  
     
     
         11 . Joint structure comprising at least one plate or extrusion made of aluminium-magnesium alloy according to any one of  claims 1  to  8 .  
     
     
         12 . Use of an aluminium-magnesium alloy according to any one of  claims 1  to  11  at an operating temperature greater than 80° C.  
     
     
         13 . Use of an aluminium-magnesium alloy according to any one of  claims 1  to  8  as a weld filler alloy.