日本金属学会誌

J. Japan Inst. Metals, Vol. 4, No. 3 (1940),
pp. 69-75

On the High Conductive, High Strength Copper Alloys. (I)

Masazô Okamoto1

1東北帝國大學金屬材料研究所

Abstract:

Among the various properties required by electrical high conductive materials, the strength and electrical conductivity are the essential elements, which could be supplied only by age-hardenable alloys, but they are limited to such alloys that conform the following requirements: - as apparent from the Le Chatelier-Guertlers' law, the elements alloyed into copper must be firstly in low concentration in order to raise the electrical conductivity, and next, the structural changes due to heat treatment must occur in such way that in the quenched state, the added elements dissolve as much as possible into solid solution of copper, and in the tempered state, the greater part of them precipitates out from the supersaturated solid solution, remainig the solid solution matrix almost as pure copper.
With these requirements in mind, about 250 specimens of copper base alloys containing small amount of other elements were prepared, and the changes in electrical conductivity, mechanical properties (mainly hardness), forgeability as well as the microstructures of them due to various heat treatments were examined. The alloys were discussed by classifying them conventionally into four groups from the result of the systematic investigation, as follows.
1 st. kind group-containing neither P, As, Si nor Be,
2 nd. kind group-containing P or As but not Si and Be,
3 rd. kind group-containing Si but not Be;
4 th. kind group-containing Be,
In the 1 st. kind alloys none but Fe-Co-Zn-Cu alloys were comparatively good in strength. In the 2 nd. kind alloys there are Ni-P-Cu, Ni-Fe-P-Cu alloys, the properties of them being very worthy to be noted. There are Ni-Si-Cu, Ni-Co-Si-Cu and Co-Si-Cu alloys in the 3 rd. group. In the 4 th. kind alloys containing less than 0.5% Be many superior alloys can be found. Among them it may be said that Ni-Be-Cu base alloys are the best in conductivity and agehardenability, the amounts of Ni less than 3% and of Be not more than 0.5% being beneficial. The existence of Si, Mn or Al with Be greatly diminished the beneficial effect of Be.
Besides the above alloys, the properties of Co-Be-Cu and Ni-P-Be-Cu alloys were also to be noted.


(Received 1939/12/23)

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