Titanium-copper alloy material, and heat-treating or hot-rolling method of titanium-copper alloy

Abstract

Spinodal decomposition of Cu alloy, which contains from 0.5 to less than 5.0% of Ti, is suppressed and a low hardness dispersion of Hv 40 or less is obtained over a sheet surface. In addition, an isotropy in terms of tensile strength in the vertical direction over the sheet surface is improved such that it is 50N/mm 2 or less. In the hot-rolling of the alloy, it is cooled at a cooling speed of not less than 200K (200° C.)/second at least in a temperature range of between 773K (500° C.) and 573K (300° C.).

1 . Hot-rolled titanium-copper alloy material having solution-treated temper, characterized in that it contains not less than 0.5 mass % and less than 5.0 mass % of Ti, the balance being essentially Cu and unavoidable impurities, and has a hardness difference between the maximum value and the minimum value amounting to Hv 40 or less.  
     
     
         2 . Hot-rolled titanium-copper alloy material having solution-treated temper, according to  claim 1 , characterized in that it is hot-rolled at a temperature not less than 873K (600° C.) and rolling-finished at a temperature not less than 773K (500° C.), followed by cooling at a cooling speed of not less than 200K (200° C.)/second at least in a temperature range of between 773K (500° C.) and 573K (300° C.).  
     
     
         3 . Hot-rolled titanium-copper alloy material having solution-treated temper, according to  claim 1 , characterized in that it is solution-treated by heating at a temperature of not less than 873K (600° C.), followed by cooling at a cooling speed of not less than 200K (200° C.)/second at least in a temperature range of between 773K (500° C.) and 573K(300° C.).  
     
     
         4 . Cold-rolled titanium-copper alloy material having solution-treated temper, characterized in that it contains not less than 0.5 mass % and less than 5.0 mass % of Ti, the balance being essentially Cu and unavoidable impurities, and has a hardness difference between the maximum value and the minimum value amounting to Hv 40 or less.  
     
     
         5 . Cold-rolled titanium-copper alloy material having solution-treated temper, according to  claim 4 , characterized in that it is solution-treated by heating at a temperature of not less than 873K (600° C.), followed by cooling at a cooling speed of not less than 200K (200° C.)/second at least in a temperature range of at least between 773K (500° C.) and 573K (500° C.).  
     
     
         6 . Titanium-copper alloy material according to  claim 1 ,  2 ,  3 ,  4  or  5  in the form of a sheet, wherein hardness difference of Hv 40 or less is satisfied over a sheet surface area of 0.27 m 2 .  
     
     
         7 . Titanium-copper alloy material according to  claim 6 , wherein the hardness is from Hv 80 to 300.  
     
     
         8 . Titanium-copper alloy material according to  claim 7 , wherein the hardness difference is Hv 30 or less.  
     
     
         9 . Wrought titanium-copper alloy material having improved bending property, produced by rolling, solution-treatment and aging, characterized in that: it contains not less than 0.5 mass % and less than 5.0% of Ti, the balance being essentially Cu and unavoidable impurities; the grain size is not less than 0.005 mm and less than 0.035 mm directly after the final solution-treatment; the tensile strength under the wrought state is 800 N/mm 2 ; and the anisotropy in terms of tensile-strength difference between that in the parallel and perpendicular directions is not more than 50 N/mm 2 .  
     
     
         10 . Wrought titanium-copper alloy material having improved formability, according to  claim 9 , characterized in that the anisotropy is not more than 30N/mm 2 .  
     
     
         11 . Heat-treating method of titanium-copper alloy, which contains not less than 0.5 mass % and less than 5.0% of Ti, the balance being essentially Cu and unavoidable impurities, by means of solution-treatment and aging, characterized in that it is solution-treated by heating at a temperature of not less than 873K (600° C.), followed by cooling at a cooling speed of not less than 200K (200° C.)/second at least in a temperature range of between 773K (500° C.) and 573K (300° C.).  
     
     
         12 . Heat-treating method of titanium-copper alloy according to  claim 11 , wherein the solution treatment is carried out in an induction heating apparatus.  
     
     
         13 . Heat-treating method of titanium-copper alloy, which contains not less than 0.5 mass % and less than 5.0 mass % of Ti, the balance being Cu and unavoidable impurities, characterized in that it is hot-rolled at a temperature not less than 873K (600° C.) and finished at a temperature not less than 773K (500° C.), followed by cooling at a cooling speed of not less than 200K (200° C.)/second at least in a temperature range of at least between 773K (500° C.) and 573K (300° C.).