The constituent of the whole ternary system copper-aluminium-silicon were considered. No ternary intermetallic compound is observed and 15 definite constituents which have. been determined in each binary system were also found to occur in this ternary system. There exist 11 surfaces of the primary separation, and 8 invariant points on the liquidus surface; among them 2 points are ternary eutectic, 1 point ternary peritectic, and 5 points peritecto-eutectic. Both the β phases of the Cu-Si and Cu-Al system are completely soluble in all proportions in the ternary system, and it decomposes into α+γt; the univariant reaction line of this decomposition has a minimum point at about 500°C. 2 invariant reactions in solid state, γ
t+γ
s χ+α, γt+χ α+ε
s", are found to exlst at 675° and 495°C. Five invariant reactions; γt+ε
2a δ+Si, ε
2a δ+ζ
1+Si, ζ
1 δ+ζ
2+Si, ε
2a+η
1 ζ
1+Si, ζ
1+η
1 ζ
2+Si and two ternary polymorphic changes due to the η
1 η
2 phases, take place almost the same temperatures as in the binary Cu-Al system. Four ternary polymorphic changes due to the ε
s ε
s' and ε
s' ε
s" take place at 600° γt+ε
s S
s'+X, 550°γt+ε
s' ε
s"+X, 585°γt+ε
s ε
s'+Si, and 525°γt+ε
s' ε
s"+Si respectively. The limit of solubility of silicon and aluminium in Solid copper has been also determined.
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