The auther investigated the practical application of the heat-treatable copper alloys of Cu-Ni-Si series invented by M. G. Corson. For the electrical conductorsalloys containing 3-4% Ni, 0.8-1.0% Si and balance Cu were chosen, and succeededin commercial production of wires showing tensile strength of 80-100kg/mm
2with electrical conductivity of 35-50% of the standard annealed copper. These figures surpass the properties of any of the hitherto known copper alloys used in electrical purposes. It was also proved that the heat-treated wires were more stable to heat and vibration than merely hard drawn wires. They are replacing the old type silicon bronze wires or copper clad steel wires and yearly about 300 tons are now used in Japan.
For the mechanical purposes alloys containing4% Al and 8% Zn besides Ni and Si were chosen. In the forged state they show thetensile strength of 85-98kg/mm
2with the elongation of 8-15% which are comparable to the highest class copper alloys of other types.
The auther calls a particular attension to the repeated application of cold working and temper-hardening after previous quenching. It promotes the complete precipitationand is important for the obtaining the optimum properties of the said alloys.
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