PURPOSE: To develop a Cu alloy having excellent fatigue properties without lowering the mechanical properties and electroconductivity thereof by adding specific amt. of Al to the prior Cu-Ni-Si alloy.
CONSTITUTION: The Cu alloy contg., by weight, 1.5W20% Ni, 0.3W1.5% Si and 0.4W6.0% Al in such a manner that Ni:Al=3W5:1 and Ni:Si=3W5:1 are regulated, or furthermore contg. total 0.04W5.0% of one or more kinds among 0.03W4.0% Zn, 0.03W1.5% Mn, 0.03W0.5% Mg, 0.03W0.7% Ti, 0.03W0.7% Cr, 0.01W0.2% Zr, 0.03W0.7% Fe, 0.01W0.5% P, and 0.001W0.1% B is used as the Cu alloy for a member of a switch, relay, etc., to which repeated stress is applied. In this way, fine compounds such as NiAl, Ni2Al3, etc., including Ni2Si are deposited in a matrix and the fatigue properties of the titled alloy by repeated load are improved.
ITO TAKEFUMI
KUBOZONO KENJI
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