| 摘要 |
PURPOSE: To obtain superior strength while suppressing irregularities of wavelengths, etc., of the fluctuations and to provide a copper alloy by which superior bendability is obtained while suppressing growth of crystal grains. CONSTITUTION: The copper alloy comprises 2.0 to 4.0 mass % of Ti; not more than 0.1 mass % in total of unavoidable impurity elements consisting of Pb, Sn, Zn, Mn, Fe, Co, Ni, S, Si, Al, P, As, Se, Te, Sb, Bi, Au, and Ag, each unavoidable impurity element being contained at not more than 0.01 mass %; and second-phase particles of area of not less than 0.01μm¬2 observed by a cross section speculum, wherein not less than 80 % of the number of the second-phase particles contain not less than 3 % in total amount of the unavoidable impurity elements in composition, wherein when the second-phase particles of not less than 0.01μm¬2 area observed by a cross section speculum is assumed to be a circle having a diameter of D, the diameter D is 0.2 to 1.0μm. |
