Copper alloy and producing method therefor

Abstract

Superior bendability in a copper alloy and further strength improvement ensures characteristics which are sufficiently superior in view of essential qualities of strength of titanium-copper. 2.0 to 4.0 mass % of Ti, 0.01 to 0.50 mass % of one or more than one kind of element from among Fe, Co, Ni, Cr, V, Zr, B, and P as the third element group are contained, and not less than 50% of the total content of these elements is made to exist as second-phase particles.

What is claimed is:  
     
         1 . A copper alloy comprising: 
 2.0 to 4.0 mass % of Ti; and    0.01 to 0.50 mass % of at least one element selected from Fe, Co, Ni, Cr, V, Zr, B, and P as a third element group; wherein not less than 50% of the total content of the third element group exists as a second-phase particle.    
     
     
         2 . A copper alloy comprising: 
 2.0 to 4.0 mass % of Ti;    0.01 to 0.50 mass % of at least one element selected from Fe, Co, Ni, Cr, V, Zr, B, and P as a third element group; and    a second-phase particle with not less than 0.01 μm 2  area observed by a cross section speculum;    wherein the rate of the number of second-phase particles in which the content of the third element group within the second-phase particles is not less than 10 times the content of the third element group within the alloy is not less than 70% of the total number of the second-phase particle.    
     
     
         3 . A copper alloy comprising: 
 2.0 to 4.0 mass % of Ti;    0.01 to 0.50 mass % of at least one element selected from Fe, Co, Ni, Cr, V, Zr, B, and P as a third element group; and    a second-phase particle with not less than 0.01 μm 2  area observed by a cross section speculum;    wherein the second-phase particle has an area percentage Af of not more than 1.0%.    
     
     
         4 . A copper alloy comprising: 
 2.0 to 4.0 mass % of Ti;    0.01 to 0.50 mass % of at least one element selected from Fe, Co, Ni, Cr, V, Zr, B, and P as a third element group;    a second-phase particle with not less than 0.01 μm 2  area observed by a cross section speculum; and    an equable dispersion degree E defined by the following equation            E   =           1   n            ∑   i   n                       (       d   i     -         A   o     /     N   A           )     2                 A   o       N   A                             wherein d i  is the distance from the i-th second-phase particle to the nearest second-phase particle, A o  is the measured visual field area, and N A  is the number of the second-phase particle confirmed within the measured visual field area, wherein the equable dispersion degree E is not more than 0.8.    
     
     
         5 . A copper alloy comprising: 
 2.0 to 4.0 mass % of Ti;    0.01 to 0.50 mass % of at least one element selected from Fe, Co, Ni, Cr, V, Zr, B, and P as a third element group;    an area percentage Af of a second-phase particle with not less than 0.01 μm 2  area observed by a cross section speculum, wherein the area percentage Af is not more than 1.0%;    a the second-phase particle with not less than 0.01 μm 2  area observed by the cross section speculum; and    an equable dispersion degree E defined by the following equation            E   =           1   n            ∑   i   n                       (       d   i     -         A   o     /     N   A           )     2                 A   o       N   A                             wherein d i  is the distance from the i-th second-phase particle to the nearest second-phase particle, A o  is the measured visual field area, and N A  is the number of the second-phase particle confirmed within the measured visual field area, wherein the equable dispersion degree E is not more than 0.8.    
     
     
         6 . The copper alloy according to  claim 1 , wherein the content of the Ti is 2.5 to 3.5 mass %.  
     
     
         7 . A producing method for the copper alloy of  claim 1  comprising the steps of: 
 producing an ingot in which 0.01 to 0.50 mass % of at least one element selected from Fe, Co, Ni, Cr, V, Zr, B, and P is added to Cu, and 2.0 to 4.0 mass % of Ti is added;  
 solution treating for heating the ingot up to ultimate temperature T° C., the ingot heated to temperature exceeding 600° C. at a heating rate of not less than 20° C./sec, and the ingot is then held for not less than 10 sec within a temperature range of T-100° C. to T° C., resulting in a supersaturated solid solution;  
 cold rolling by applying cold rolling with 5 to 50% of degree of processing from conditions of the supersaturated solid solution; and  
 aging treating for applying a thermal treatment to the rolled material at 350 to 450° C.