Automobile body part

Abstract

In a car body or component of a car body with at least one first component of sheet metal of a first aluminium alloy (A) and at least one second component of sheet metal of a second aluminium alloy (B), the first and second aluminium alloy are of type AlMgSi and in the sheet metal of the second aluminium alloy (B) a substantial part of the elements Mg and Si, which are required to achieve artificial ageing in solid solution, is present in the form of separate Mg 2 Si and/or Si particles in order to avoid artificial ageing. As well as common recycling of process scrap in the production of the various components and simple scrap recycling of the body parts from the end of life car, by reduction of the hardening capacity of the second component during artificial ageing of the body as part of the paint baking cycle, the car body has an improved impact protection for pedestrians in comparison with solutions according to the prior art.

1 . A sheet metal AlMqSi type aluminium alloy automobile body part, wherein a substantial part of the Mg and Si in the sheet metal alloy, which are required to achieve artificial ageing in solid solution, are present as separate Mg 2 Si and/or Si particles in to avoid artificial ageing.  
     
     
         2 . A sheet metal AlMqSi type aluminium alloy automobile body part according to  claim 1 , wherein the aluminium alloy consists essentially of: 
 0.6 to 1.2 weight percent silicon;    0.3 to 0.8 weight percent magnesium;    max. 0.8 weight percent copper;    max. 0.4 weight percent iron;    max. 0.3 weight percent manganese;    max. 0.2 weight percent vanadium;    with production-related contaminants and aluminium as the remainder.    
     
     
         3 . A sheet metal AlMgSi type aluminium alloy automobile body part according to  claim 1 , wherein the aluminium alloy consists essentially of: 
 0.25 to 0.60 weight percent silicon;    0.25 to 0.60 weight percent magnesium;    0.25 to 0.30 weight percent copper;    max. 0.40 weight percent iron,    max. 0.30 weight percent manganese;    max. 0.20 weight percent vanadium;    with production-related contaminants, individually a maximum of 0.05 weight percent, total maximum of 0.15 weight percent, and aluminium as the remainder.    
     
     
         4 . A sheet metal AlMgSi type aluminium alloy automobile body part according to  claim 3 , wherein the aluminium alloy contains 0.30 to 0.50 weight percent silicon.  
     
     
         5 . A sheet metal AlMgSi type aluminium alloy automobile body part according to claim [ 3  or]  4 , wherein the aluminium alloy contains 0.30 to 0.50 weight percent magnesium.  
     
     
         6 . A sheet metal AlMgSi type aluminium alloy automobile body part according to  claim 3 , wherein the aluminium alloy contains a maximum of 0.20 weight percent copper.  
     
     
         7 . A sheet metal AlMgSi type aluminium alloy automobile was body part according to  claim 6 , wherein the aluminium alloy contains 0.05 to 0.20 weight percent iron.  
     
     
         8 . A sheet metal AlMgSi type aluminium alloy automobile body part according to  claim 7 , wherein the aluminium alloy contains a maximum of 0.15 weight percent vanadium.  
     
     
         9 . A sheet metal AlMgSi type aluminium alloy automobile body part according to  claim 8 , wherein the aluminium alloy contains 0.10 weight percent manganese.  
     
     
         10 . A sheet metal AlMgSi type aluminium alloy automobile body part according to  claim 9 , wherein the automobile body part is as an inner panel of a body part, a hood, a trim part, a structural component or a reinforcing element in the front part of an automobile body.  
     
     
         11 . A sheet metal AlMgSi type aluminium alloy automobile body part according to  claim 9 , wherein the automobile panel is as a deep-drawn body part with good bending behavior.  
     
     
         12 . An automobile body or component thereof comprising first and second AlMgSi type aluminum alloy sheet metal components, wherein after articifical ageing of the body of component thereof the second component has lower mechanical strength than the first component, wherein at least in the sheet metal of the second aluminium alloy, before artificial ageing of the body or body part, a substantial part of the elements Mg and Si, which are required to achieve artificial ageing in solid solution, is present in the form of separate Mg 2 Si and/or Si particles in order to avoid artificial ageing.  
     
     
         13 . An automobile body or component thereof according to  claim 12 , wherein at least the first aluminium alloy component consists essentially of: 
 0.6 to 1.2 weight percent silicon;    0.3 to 0.8 weight percent magnesium;    max. 0.8 weight percent copper;    max. 0.4 weight percent iron;    max. 0.3 weight percent manganese,    max. 0.2 weight percent vanadium: and    production-related contaminants with aluminium as the remainder.    
     
     
         14 . An automobile body or component thereof according to  claim 13 , wherein the second aluminium alloy component consists essentially of: 
 0.25 to 0.60 weight percent silicon;    0.25 to 0.60 weight percent magnesium;    0.05 to 0.30 weight percent copper;    max. 0.40 weight percent iron;    max. 0.30 weight percent manganese,    max. 0.20 weight percent vanadium, and    production-related contaminants, individually a maximum of 0.05 weight percent total maximum of 0.15 weight percent, with aluminium as the remainder.    
     
     
         15 . An automobile body or component thereof according to  claim 14 , wherein the second aluminium alloy component contains 0.30 to 0.50 weight percent silicon.  
     
     
         16 . An automobile body or component thereof according to  claim 15 , wherein the second aluminium alloy component contains 0.30 to 0.50 weight percent magnesium.  
     
     
         17 . An automobile body or component thereof according to any of  claims 14  to  16 , wherein the second aluminium alloy component contains a maximum of 0.20 weight percent copper.  
     
     
         18 . An automobile body or component thereof according to  claim 17 , wherein the second aluminium alloy component contains 0.05 to 0.20 weight percent iron.  
     
     
         19 . An automobile body or component thereof according to  claim 18 , wherein the second aluminium alloy component contains a maximum of 0.15 weight percent vanadium.  
     
     
         20 . An automobile body or component thereof according to  claim 19 , wherein the second aluminium alloy component contains a maximum of 0.10 weight percent manganese.  
     
     
         21 . An automobile body or component thereof according to  claim 20 , wherein the second are inner panels of an automobile body part, a hood, a trim part, a structural component or a reinforcing element for the front part of a car body.  
     
     
         22 . An automobile body or component thereof according to  20 , wherein the second components are deep-drawn with good bending behavior.