The Equilibrium Diagram of the Cadmium-Silver-Copper System

Abstract

Using 147 kinds of this ternary alloy, the equilibrium diagram has been thoroughly studied chiefly by thermal analysis and microscopic examination. In this ternary system, no ternary compound exists, while 3 binary compounds, Cu₂Cd, Cu₄Cd₃ and CuCd₃, 2 Ag-Cd binary solid solutions β and ε and 4 ternary solid solutions, Cu, Ag, δ and η exist. η ternary solid solution is formed by Cu₅Cd₈ and γ solid solutions. So there exist 9 primary crystallization surfaces and 14 monovariant curves, and along these curves the following reactions take place,
Mono-variant reactions:(1) M_??_Cu+Ag, (2) M+Ag_??_β, (3) M_??_β+Cu, (4) M+β_??_η,
(5) M_??_Cu+η, (6) M+Cu_??_Cu₂Cd, (7) M_??_Cu₂Cd+η, (8) M+Cu₂Cd_??_Cu₄Cd₃,
(9) M_??_η+Cu₄Cd₃, (10) M+η_??_δ, (11) M+η_??_CuCd₃, (12) M_??_CuCd₃+δ,
(13) M+δ_??_ε, (14) M_??_Cd+CuCd₃.
In this ternary system, there exist 5 non-variant points, at which the following reactions take place at temperatures given.
Non-variant reactions:
(1) M+Ag_??_β+Cu, (712°) (2) M+β_??_η+Cu (620°), (3) M+Cu_??_Cu₂Cd+η, (518°),
(4) M+Cu₂Cd_??_η+Cu₄Cd₃ (516°), (5) M+η_??_CuCd₃+δ (329°), (6) M+δ_??_CuCd₃+ε (318°).