Aluminum alloy material for monolayer heat-joining with excellent deformation resistance

Abstract

To provide an aluminum alloy material having a heat-joining function in monolayer, in which a decrease in deformation resistance caused by working before brazing is suppressed. The present invention is an aluminum alloy material including Si: 1.5 mass % to 5.0 mass %, Mn: 0.05 mass % to 2.0 mass %, Fe: 0.01 mass % to 2.0 mass %, and balance: Al and inevitable impurities and having a heat-joining function in monolayer. The aluminum alloy material has a fibrous structure, the number density of second phase particles including an Si-based compound or an AlMnFeSi-based compound and having an equivalent circle diameter of 5.0 μm to 10.0 μm is 1,000/mm2 or less, the work hardening exponent n between two points from a nominal strain that is 0.9 times the nominal strain at maximum load to the nominal strain at maximum load is 0.03 or more, and the local elongation is 1% or more.

What is claimed is: 
     
         1 . An aluminum alloy material comprising Si: 1.5 mass % to 5.0 mass %, Mn: 0.05 mass % to 2.0 mass %, Fe: 0.01 mass % to 2.0 mass %, and balance: Al and inevitable impurities and having a heat-joining function in monolayer, wherein
 the aluminum alloy material has a fibrous structure,   the number density of second phase particles including an Si-based compound or an AlMnFeSi-based compound and having an equivalent circle diameter of 5.0 μm to 10.0 μm is 1,000/mm 2  or less,   the work hardening exponent n between two points from a nominal strain that is 0.9 times the nominal strain at maximum load to the nominal strain at maximum load is 0.03 or more, and   the local elongation is 1% or more.   
     
     
         2 . The aluminum alloy material having a heat-joining function in monolayer according to  claim 1 , further comprising at least one of the following elements:
 Zn: 0.05 to 6.0%   Mg: 0.05 to 2.0%   Cu: 0.05 to 1.5%   Ni: 0.05 to 2.0%   Cr: 0.05 to 0.3%   Zr: 0.05 to 0.3%   Ti: 0.05 to 0.3%   V: 0.05 to 0.3%.   
     
     
         3 . The aluminum alloy material having a heat-joining function in monolayer according to  claim 1 , further comprising at least one of the following elements:
 In: 0.005 to 0.3%   Sn: 0.005 to 0.3%.   
     
     
         4 . The aluminum alloy material having a heat-joining function in monolayer according to  claim 2 , further comprising at least one of the following elements:
 In: 0.005 to 0.3%   Sn: 0.005 to 0.3%.   
     
     
         5 . The aluminum alloy material having a heat-joining function in monolayer according to  claim 1 , further comprising at least one of the following elements:
 Be: 0.0001 to 0.1%   Sr: 0.0001 to 0.1%   Bi: 0.0001 to 0.1%   Na: 0.0001 to 0.1%   Ca: 0.0001 to 0.05%.   
     
     
         6 . The aluminum alloy material having a heat-joining function in monolayer according to  claim 2 , further comprising at least one of the following elements:
 Be: 0.0001 to 0.1%   Sr: 0.0001 to 0.1%   Bi: 0.0001 to 0.1%   Na: 0.0001 to 0.1%   Ca: 0.0001 to 0.05%.   
     
     
         7 . The aluminum alloy material having a heat-joining function in monolayer according to  claim 3 , further comprising at least one of the following elements:
 Be: 0.0001 to 0.1%   Sr: 0.0001 to 0.1%   Bi: 0.0001 to 0.1%   Na: 0.0001 to 0.1%   Ca: 0.0001 to 0.05%.   
     
     
         8 . The aluminum alloy material having a heat-joining function in monolayer according to  claim 4 , further comprising at least one of the following elements:
 Be: 0.0001 to 0.1%   Sr: 0.0001 to 0.1%   Bi: 0.0001 to 0.1%   Na: 0.0001 to 0.1%   Ca: 0.0001 to 0.05%.   
     
     
         9 . A method for producing the aluminum alloy material according to  claim 1 , comprising:
 a casting step of producing a slab by DC casting;   after the casting step, a step of hot rolling after performing a homogenization treatment step or after performing, without a homogenization treatment, a heating step of heating before hot rolling;   a step of cold rolling after the hot rolling step; and   an annealing step performed at least once during the cold rolling step,   wherein the casting speed in the casting step is 20 to 100 mm/min,   the homogenization treatment step or the heating step before hot rolling is performed under conditions including a heating temperature of 350° C. to 480° C. and a maintenance time of 0 to 30 hours, and,   in the annealing step, annealing is performed at a temperature for a period of time such that recrystallization is not caused.   
     
     
         10 . A method for producing the aluminum alloy material according to  claim 2 , comprising:
 a casting step of producing a slab by DC casting;   after the casting step, a step of hot rolling after performing a homogenization treatment step or after performing, without a homogenization treatment, a heating step of heating before hot rolling;   a step of cold rolling after the hot rolling step; and   an annealing step performed at least once during the cold rolling step, wherein   the casting speed in the casting step is 20 to 100 mm/min,   the homogenization treatment step or the heating step before hot rolling is performed under conditions including a heating temperature of 350° C. to 480° C. and a maintenance time of 0 to 30 hours, and,   in the annealing step, annealing is performed at a temperature for a period of time such that recrystallization is not caused.   
     
     
         11 . A method for producing the aluminum alloy material according to  claim 3 , comprising:
 a casting step of producing a slab by DC casting;   after the casting step, a step of hot rolling after performing a homogenization treatment step or after performing, without a homogenization treatment, a heating step of heating before hot rolling;   a step of cold rolling after the hot rolling step; and   an annealing step performed at least once during the cold rolling step, wherein   the casting speed in the casting step is 20 to 100 mm/min,   the homogenization treatment step or the heating step before hot rolling is performed under conditions including a heating temperature of 350° C. to 480° C. and a maintenance time of 0 to 30 hours, and,   in the annealing step, annealing is performed at a temperature for a period of time such that recrystallization is not caused.   
     
     
         12 . A method for producing the aluminum alloy material according to  claim 4 , comprising:
 a casting step of producing a slab by DC casting;   after the casting step, a step of hot rolling after performing a homogenization treatment step or after performing, without a homogenization treatment, a heating step of heating before hot rolling;   a step of cold rolling after the hot rolling step; and   an annealing step performed at least once during the cold rolling step, wherein   the casting speed in the casting step is 20 to 100 mm/min,   the homogenization treatment step or the heating step before hot rolling is performed under conditions including a heating temperature of 350° C. to 480° C. and a maintenance time of 0 to 30 hours, and,   in the annealing step, annealing is performed at a temperature for a period of time such that recrystallization is not caused.   
     
     
         13 . A method for producing the aluminum alloy material having a heat-joining function in monolayer according to  claim 1 , comprising:
 a casting step of producing a plate-shaped ingot by continuous casting;   a homogenization treatment step performed after the casting step;   a step of cold rolling after the homogenization treatment step; and   an annealing step performed at least once during the cold rolling step, wherein   the casting speed in the casting step is 500 to 3,000 mm/min,   the homogenization treatment step is performed under conditions including a heating temperature of 350° C. to 480° C. and a maintenance time of 1 to 10 hours, and,   in the annealing step, annealing is performed at a temperature for a period of time such that recrystallization is not caused.   
     
     
         14 . A method for producing the aluminum alloy material having a heat-joining function in monolayer according to  claim 2 , comprising:
 a casting step of producing a plate-shaped ingot by continuous casting;   a homogenization treatment step performed after the casting step;   a step of cold rolling after the homogenization treatment step; and   an annealing step performed at least once during the cold rolling step, wherein   the casting speed in the casting step is 500 to 3,000 mm/min,   the homogenization treatment step is performed under conditions including a heating temperature of 350° C. to 480° C. and a maintenance time of 1 to 10 hours, and,   in the annealing step, annealing is performed at a temperature for a period of time such that recrystallization is not caused.   
     
     
         15 . A method for producing the aluminum alloy material having a heat-joining function in monolayer according to  claim 3 , comprising:
 a casting step of producing a plate-shaped ingot by continuous casting;   a homogenization treatment step performed after the casting step;   a step of cold rolling after the homogenization treatment step; and   an annealing step performed at least once during the cold rolling step, wherein   the casting speed in the casting step is 500 to 3,000 mm/min,   the homogenization treatment step is performed under conditions including a heating temperature of 350° C. to 480° C. and a maintenance time of 1 to 10 hours, and,   in the annealing step, annealing is performed at a temperature for a period of time such that recrystallization is not caused.   
     
     
         16 . A method for producing the aluminum alloy material having a heat-joining function in monolayer according to  claim 4 , comprising:
 a casting step of producing a plate-shaped ingot by continuous casting;   a homogenization treatment step performed after the casting step;   a step of cold rolling after the homogenization treatment step; and   an annealing step performed at least once during the cold rolling step, wherein   the casting speed in the casting step is 500 to 3,000 mm/min,   the homogenization treatment step is performed under conditions including a heating temperature of 350° C. to 480° C. and a maintenance time of 1 to 10 hours, and,   in the annealing step, annealing is performed at a temperature for a period of time such that recrystallization is not caused.   
     
     
         17 . The method for producing the aluminum alloy material according to  claim 9 , wherein the annealing step is followed by cold rolling, and the working ratio in the cold step is 20% or less. 
     
     
         18 . The method for producing the aluminum alloy material according to  claim 13 , wherein the annealing step is followed by cold rolling, and the working ratio in the cold step is 20% or less.