16-01-2014 дата публикации
Номер: US20140014240A1
A Cu—Si—Co-based alloy having an enhanced spring limit is provided. The copper alloy comprises 0.5-2.5 mass % of Co, 0.1-0.7 mass % of Si, the balance Cu and inevitable impurities, wherein, from a result obtained from measurement of an X ray diffraction pole figure, using a rolled surface as a reference plane, a peak height at β angle of 90° among diffraction peaks in {111} Cu plane with respect to {200} Cu plane by β scanning at α=35° is at least 2.5 times that of a standard copper powder. 1. A copper alloy for electronic materials , comprising 0.5-2.5 mass % of Co , 0.1-0.7 mass % of Si , optionally containing less than 1.0 mass % of Ni , further optionally containing at most 2.0 mass % in total of at least one selected from the group consisting of Cr , Mg , P , As , Sb , Be , B , Mn , Sn , Ti , Zr , Al , Fe , Zn , and Ag , the balance Cu and inevitable impurities , wherein , from a result obtained from measurement of an X ray diffraction pole figure , using a rolled surface as a reference plane , a peak height at β angle of 90° among diffraction peaks in {111} Cu plane with respect to {200} Cu plane by β scanning at α=35° is at least 2.5 times that of a standard copper powder.2. The copper alloy according to claim 1 , wherein the copper alloy satisfies the following formulae:{'br': None, 'sup': 2', '2, '−55×(Co concentration)+250×(Co concentration)+520≧YS≧−55×Co concentration)+250×(Co concentration)+370, and\u2003\u2003Formula a{'br': None, '60×(Co concentration)+400≧Kb≧60×(Co concentration)+275,\u2003\u2003Formula bwherein these formulae, the unit of Co concentration is mass %, YS is 0.2% yield strength and Kb is spring limit.3. The copper alloy according to claim 1 , wherein YS is at least 500 MPa and Kb and YS satisfy the following relationship:{'br': None, '0.43×YS+215≧Kb≧0.23×YS+215,\u2003\u2003Formula cwherein YS is 0.2% yield strength, and Kb is spring limit.4. The copper alloy according to claim 1 , wherein the Co to Si mass concentration ratio (Co/Si) ...
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