Hitachi Cable, Inc.

Yoshiki Yamamoto

Takemi Muroga

Kenji Yokomizo

Yasuyuki Ito

Koji Aoyagi

Katsumi Nomura

Noboru Hagiwara

Hiroaki Takano

Chingping Tong

Koichi Kotoku

A copper alloy material having: 1.0 to 5.0 mass % of Ni; 0.2 to 1.0 mass % of Si; 1.0 to 5.0 mass % of Zn; 0.1 to 0.5 mass % of Sn; 0.003 to 0.3 mass % of P; and the balance consisting of Cu and an unavoidable impurity. The mass ratio between Ni and each of Si, Zn and Sn is to be Ni/Si=4 to 6, Zn/Ni=0.5 or more, and Sn/Ni=0.05 to 0.2.

Copper alloy material and method of making same

A rolled copper foil according to the present invention includes a crystal grain alignment wherein: when normalized intensity of {200}plane diffraction of a copper crystal in results obtained by an X-ray diffraction pole figure measurement with respect to a rolled surface is plotted against at different values of angle &#x3b1;, the normalized intensity being obtained during a &#x3b2; scanning in the pole figure measurement, a ratio of a maximum value A of the normalized intensity with angle &#x3b1; in a range of 40&#xb0; to 60&#xb0; to a maximum value B of the normalized intensity with angle &#x3b1; in a range of 80&#xb0; to 90&#xb0; is equal to or greater than 4; and when the normalized intensity increases with increasing angle &#x3b1; in a range of 25&#xb0; to 45&#xb0;, there is essentially no area in which the normalized intensity increases stepwise.

Rolled copper foil

A copper alloy material has a rolled surface having a plurality of crystal faces parallel to the rolled surface. The crystal faces includes at least one crystal face selected from a group consisted of {011}, {1nn} (n is an integer, n&#x2267;1), {11m} (m is an integer, m&#x2267;1), {023}, {012}, and {135}. Diffraction intensities of the crystal faces in an inverse pole figure obtained by crystal diffraction measurement of the rolled surface as a reference satisfy the relationships of:{011}&#x3e;{155}&#x3e;{133},{011}&#x3e;{023}&#x3e;{012}, and{011}&#x3e;{135}&#x3e;{112}.

Copper alloy material and a method for fabricating the same

A rolled copper foil applied with a recrystallization annealing after a final cold rolling step and having a crystal grain alignment satisfying a ratio of [a]/[b]&#x2267;3, where [a] and [b] are normalized average intensities of a {111}plane diffraction of a copper crystal by &#x3b2;-scanning at &#x3b1;=35&#xb0; and 74&#xb0;, respectively, in an X-ray diffraction pole figure measurement to a rolled surface is manufactured by controlling a total working ratio in the final cold rolling step before the recrystallization annealing to be 94% or more; and controlling a working ratio per one pass in the final cold rolling step to be 15 to 50%.

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Tsukuba, Japan

Yoshiki Yamamoto