Copper, copper alloy, and manufacturing method therefor

Abstract

Copper and copper alloy comprises: a structure having fine crystal grains with grain size of 1 μm or less after a final cold rolling with a reduction η, wherein η is expressed in the following formula and satisfying η≧3; and an elongation of 2% or more in a tensile test. η=ln( T 0 /T 1 ) T 0 : plate thickness before rolling, T 1 : plate thickness after rolling.

What is claimed is:  
     
         1 . Copper and copper alloy comprising: 
 a structure having fine crystal grains with grain size of 1 μm or less composed of crystal grain boundaries mainly formed of curved portions after a final cold rolling, the structure obtained by dynamic continuous recrystallization caused by the final cold rolling, and    an elongation of 2% or more in a tensile test.    
     
     
         2 . Copper and copper alloy comprising: 
 a structure having fine crystal grains with grain size of 1 μm or less after a final cold rolling with a reduction η, wherein η is expressed in the following formula and satisfying η≧3; and    an elongation of 2% or more in a tensile test.   η=ln( T   0   /T   1 )   T 0 : plate thickness before rolling, T 1 : plate thickness after rolling.    
     
     
         3 . A manufacturing method for copper and copper alloy, the method comprising: 
 a final cold rolling with a reduction η, wherein η is expressed in the following formula and satisfying η≧3,    thereby obtaining a structure having fine crystal grains with grain size of 1 μm or less after the final cold rolling, and    an elongation of 2% or more in a tensile test.   η=ln( T   0   /T   1 )   T 0 : plate thickness before rolling, T 1 : plate thickness after rolling.    
     
     
         4 . A manufacturing method for copper and copper alloy according to  claim 3 , wherein the copper and copper alloy recited in  claim 1  is processed by stress relief annealing, and elongation by a tensile test is improved to 6% or more.  
     
     
         5 . A manufacturing method for copper and copper alloy according to  claim 3 , wherein the copper and copper alloy recited in  claim 2  is processed by stress relief annealing, and elongation by a tensile test is improved to 6% or more.  
     
     
         6 . Copper and copper alloy manufactured by the manufacturing method of  claim 4 .  
     
     
         7 . Copper and copper alloy manufactured by the manufacturing method of  claim 5 .  
     
     
         8 . A manufacturing method of copper and copper alloy according to  claim 3 , wherein the copper alloy is Cu—Ni—Si alloy or Cu—Cr—Zr alloy.  
     
     
         9 . A manufacturing method of copper and copper alloy according to  claim 4 , wherein the copper alloy is Cu—Ni—Si alloy or Cu—Cr—Zr alloy.  
     
     
         10 . A manufacturing method of copper and copper alloy according to  claim 5 , wherein the copper alloy is Cu—Ni—Si alloy or Cu—Cr—Zr alloy.  
     
     
         11 . Copper and copper alloy of  claim 6 , wherein the copper alloy is Cu—Ni—Si alloy or Cu—Cr—Zr alloy.  
     
     
         12 . Copper and copper alloy of  claim 7 , wherein the copper alloy is Cu—Ni—Si alloy or Cu—Cr—Zr alloy.