Aluminum alloy rolled material for molding, with improved press formability, bending workability, and ridging resistance

Abstract

The present disclosure provides an aluminum alloy rolled material for molding, including an Al—Mg—Si—Cu-based alloy containing 0.30 mass % or more Cu. A ratio of a cube orientation density to a random orientation is 10 or more in a plane that is perpendicular to a sheet thickness direction and is at a depth of ¼ of a total sheet thickness from a surface. An absolute value of a difference between a maximum value and a minimum value of an average Taylor factor in a case in which molding is assumed to cause plane strain deformation having a main strain direction that is a rolling width direction is 1.0 or less. The average Taylor factor is obtained for each of subareas that are obtained by equal division of an area, having a 10 mm width in the rolling width direction and a 2 mm length in a rolling direction, into 10 subareas in the rolling width direction. The subareas are in a plane that is perpendicular to the sheet thickness direction and is at a depth of ½ of the total sheet thickness from the surface.

1 . An aluminum alloy rolled material for molding, with improved press formability, bending workability, and ridging resistance, the aluminum alloy rolled material comprising:
 an aluminum alloy comprising 0.30 to 1.50 mass % Cu, 0.30 to 1.50 mass % Si, 0.30 to 1.50 mass % Mg, at least one of 0.50 mass % or less Mn, 0.40 mass % or less Cr, or 0.40 mass % or less Fe, and a balance of Al and inevitable impurities,   wherein a difference between a tensile strength and a 0.2% proof stress is 120 MPa or more,   wherein a ratio of a cube orientation density to a random orientation is 10 or more in a plane that is perpendicular to a sheet thickness direction and is at a depth of ¼ of a total sheet thickness from a surface, and   wherein an absolute value of a difference between a maximum value and a minimum value of an average Taylor factor in a case in which molding is assumed to cause plane strain deformation having a main strain direction that is a rolling width direction is 1.0 or less, the average Taylor factor being obtained for each of subareas that are obtained by equal division of an area, having a 10 mm width in the rolling width direction and a 2 mm length in a rolling direction, into 10 subareas in the rolling width direction, the subareas being in a plane that is perpendicular to the sheet thickness direction and is at a depth of ½ of the total sheet thickness from the surface.   
     
     
         2 . The aluminum alloy rolled material for molding according to  claim 1 , wherein the aluminum alloy contains at least one of 0.03 to 0.50 mass % Mn, 0.01 to 0.40 mass % Cr, or 0.03 to 0.40 mass % Fe. 
     
     
         3 . The aluminum alloy rolled material for molding according to  claim 2 , wherein the aluminum alloy contains at least one of 0.03 to 0.15 mass % Mn, 0.01 to 0.04 mass % Cr, or 0.03 to 0.40 mass % Fe. 
     
     
         4 . The aluminum alloy rolled material for molding according to  claim 1 , wherein the aluminum alloy contains 0.03 to 0.80 mass % Cu. 
     
     
         5 . The aluminum alloy rolled material for molding according to  claim 1 , wherein the aluminum alloy contains 0.03 to 0.80 mass % Mg. 
     
     
         6 . The aluminum alloy rolled material for molding according to  claim 1 , wherein the difference between the tensile strength and the 0.2% proof stress is 121 to 133 MPa. 
     
     
         7 . The aluminum alloy rolled material for molding according to  claim 1 , wherein the ratio of the cube orientation density to the random orientation is 12 or more. 
     
     
         8 . The aluminum alloy rolled material for molding according to  claim 7 , wherein the ratio of the cube orientation density to the random orientation is 12 to 18. 
     
     
         9 . The aluminum alloy rolled material for molding according to  claim 1 , wherein the absolute value of the difference between the maximum value and the minimum value of the average Taylor factor is 0.9 or less. 
     
     
         10 . The aluminum alloy rolled material for molding according to  claim 9 , wherein the absolute value of the difference between the maximum value and the minimum value of the average Taylor factor is 0.5 to 0.9. 
     
     
         11 . The aluminum alloy rolled material for molding according to  claim 1 , wherein, in 180-degree bending working, a score given by comparison with workability evaluation samples is 6 or more. 
     
     
         12 . The aluminum alloy rolled material for molding according to  claim 11 , wherein, in the 180-degree bending working, the score given by comparison with the workability evaluation samples is 7 or more. 
     
     
         13 . The aluminum alloy rolled material for molding according to  claim 12 , wherein, in the 180-degree bending working, a score given by comparison with the workability evaluation samples is 8 or more. 
     
     
         14 . The aluminum alloy rolled material for molding according to  claim 1 , wherein the aluminum alloy rolled material is obtained by rolling working including hot rolling working, and an average particle size of precipitated particles having particle diameters of 0.4 to 4.0 μm is 0.6 μm or more in pre-rolling heating and retention prior to the hot rolling working. 
     
     
         15 . The aluminum alloy rolled material for molding according to  claim 14 , wherein the average particle size of the precipitated particles having particle diameters of 0.4 to 4.0 μm is 0.7 to 1.9 μm. 
     
     
         16 . The aluminum alloy rolled material for molding according to  claim 14 , wherein a density of the precipitated particles having particle diameters of 0.4 to 4.0 μm is equal to or less than 1500 particles/100 μm 2 . 
     
     
         17 . The aluminum alloy rolled material for molding according to  claim 16 , wherein the density of the precipitated particles having particle diameters of 0.4 to 4.0 μm is 402 particles/100 μm 2  to 1411 particles/100 μm 2 . 
     
     
         18 . The aluminum alloy rolled material for molding according to  claim 1 , wherein a recrystallization rate after the hot rolling working is 95% or more. 
     
     
         19 . The aluminum alloy rolled material for molding according to  claim 18 , wherein the recrystallization rate after the hot rolling working is 100%.