| 摘要 |
PURPOSE: To obtain excellent bendability while suppressing precipitation of TiCu3, and to achieve further strength improvement in such a manner as to secure excellent characteristics which are sufficient in view of essential qualities of strength of titanium-copper. CONSTITUTION: The copper alloy comprises 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. The copper alloy comprises 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. The producing method for the copper alloy comprises the processes 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 treatment of the ingot up to ultimate temperature T deg.C, the ingot heated to temperature exceeding 600 deg.C at a heating rate of not less than 20 deg.C/sec, and the ingot is then held for not less than 10 sec within a temperature range of T-100 deg.C to T deg.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 treatment of the rolled material at 350 to 450 deg.C.
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