To attain large reduction at hot working and to improve productivity by adding specific amounts of Nb to an alloy having a composition consisting of specific amounts of Ni and Fe and the balance Cu with inevitable impurities.
This alloy has a composition consisting of, by weight, 5-30% Ni, 5-30% Fe, and the balance Cu with inevitable impurities. By adding 0.05-0.5% Nb as a third element to the alloy, grain growth can be suppressed and hot workability can be improved. It is preferable that 0.1-5.0% Mn is further added to the alloy. Ni is an essential element to the manufacture of a magnetic material excellent in magnetic properties, such as residual magnetic flux density and coercive force. Fe performs the same function. Mn has a function of improving residual magnetic flux density and coercive force and can provide excellent remanence ratio. As the method for obtaining the alloy in a state of fine crystalline grains, e.g. an atomizing method, a method by quenching such as ribbon quenching, and a method by pulverization can be cited.
YANAGIMOTO MASARU
TAKADA YODAI
