According to the 1st and 2nd reports, the present author investigated the changes of the mechanical properties, electrical conductivity and other properties in the most proper B 3 Alloy (Fe 1.56%, P 0.46%, Cu Bal) by coldworking and heat-treatments, Thus, he could not obtain a bit of high strength, but obtain some extent of very high conductivity in Cu-Fe-P Alloy. Then, he added the elements, Si, Sn, Zn (each of them is under 1-0%), Ag (under 2'0 %) and Cd (under 1.65%) to the B 3 Alloy, and investigated the induence caused by the addition of those elements on the change of the mechanical properties, electrical conductivity and other properties. The result is that the B 3 Alloy (2% Fe
2P-Cu Alloy) containing about 1% of Cd is the most useful of all such materials:-the tensil strength is 85_??_90kg/mm
2 and the electrical conductivity 65_??_60% if he applvs a proper cold-working and heat-treatments to this alloy. Conclusively, it is suitable that the Cu-Ni-Si Alloy (Corson's Alloy) is replaced by this Cu-Fe
2P-Cd Alloy which has the better characteristics as a high-strengthened electrical conductor.
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