From the equilibrium state of the whole system copper-nickel-silicon determined by the author, various sectional diagrams have been constructed. The following results are based on the experiments of the thermal and X-ray analyses as well as of the microscopic examination: Binary system as shown by M. G. Corson is not formed on the line Cu-Ni
2Si, and both the copper solid solution and the γ' solid solution coexist in the composition range of the Corson Alloy. Hence the second phase precipitated from the supersaturated α solid solution in the Corson Alloy is not the Ni
2Si, but the γ' and furthermore confined to the γ' only. Here the γ' is a phase formed by Ni
5Si
2 containing about 35wt.% as maximum of copper in the form of solid solution.
The structural characteristics of γ, γ' and Ni
2Si under microscope are shown by many photographs. The X-ray photographs of these phases are also given.
The κ phase existing in the Cu-Si system at the composition range of silicon from about 4.5 to 7.5% does not appear in the Corson Alloy, which is clarified by the result of the X-ray analysis. Special structures appeared in the alloy consisting of α+κ or α+κ+γ.
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