	US 7,544,259 B2
	Copper alloy, copper alloy producing method, copper complex material, and copper complex material producing method
Mitsuhiro Funaki, Sayama (Japan); Hiroki Baba, Sayama (Japan); Shinya Ohyama, Sayama (Japan); and Toshiyuki Horimukai, Sayama (Japan)
Assigned to Honda Giken Kogyo Kabushiki Kaisha, Tokyo (Japan)
Appl. No. 10/521,333 PCT Filed Jul. 17, 2003, PCT No. PCT/JP03/09102 § 371(c)(1), (2), (4) Date Mar. 15, 2005, PCT Pub. No. WO2004/009859, PCT Pub. Date Jan. 29, 2004.
Claims priority of application No. 2002-210153 (JP), filed on Jul. 18, 2002; application No. 2003-210152 (JP), filed on Jul. 18, 2002; application No. 2003-000919 (JP), filed on Jan. 07, 2003; application No. 2003-198393 (JP), filed on Jul. 17, 2003; application No. 2003-198394 (JP), filed on Jul. 17, 2003; and application No. 2003-198397 (JP), filed on Jul. 17, 2003.
Prior Publication US 2005/0205176 A1, Sep. 22, 2005
Int. Cl. C22C 9/00 (2006.01)

U.S. Cl. 148—683 [148/680; 148/681; 148/682]

2 Claims

1. A method for manufacturing a copper alloy welding electrode tip of a welding machine, comprising the steps of:

enabling any of chromium (Cr), zirconium (Zr), beryllium (Be), titanium (Ti) and boron (B) to dissolve in a solid solution in a base-material metal (Cu) as a second element that does not dissolve or scarcely dissolves in copper in a solid solution state at room temperature, wherein respective addition ratios of the second element being Cr:0.1 to 1.4 wt %, Zr:0.15 to 0.5 wt %, Be:0.1 to 3.0 wt %, Ti:0.1 to 6.0 wt %, B:0.01 to 0.5 wt %,

applying a strain equivalent to an elongation of not less than 200% to this material to achieve crystal grain refinement, wherein strain is applied by extruding the material, and extrusion conditions are such that lateral extrusion is performed at a material temperature of 400 to 1,000° C., a die temperature of 400 to 500° C., and an extrusion speed of 0.5 to 2.0 mm/sec, and

subjecting this material to aging treatment simultaneously with or subsequent to application of this strain, thereby promoting precipitation of the second element among crystal grains.