Abstract

Phase equilibria in the copper–palladium system are extrapolated to absolute zero of temperature subject to the third law of thermodynamics. The continuous solid solution with a FCC structure that crystallizes from melt experiences ordering to yield two intermetallic phases (Kurnakov phases), whose compositions shrink to CuPd and Cu₃Pd stoichiometries as temperature lowers. As temperature raises, palladium partially occupies copper sites in the intermetallic phases. Ordering obeying a second-order phase transition to yield a phase whose idealized composition may be formulated as Cu₂₁Pd₇. When in a solid state, the system forms an eutectoid at 390°C and 30 at % Pd and two dystectoids with coordinates of 510°C, 15 at % Pd and 600°C, 40 at % Pd.

中文翻译：

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铜钯相图

摘要

根据热力学第三定律，铜-钯系统中的相平衡被外推到温度的绝对零。从熔体中结晶的具有 FCC 结构的连续固溶体依次产生两个金属间相（Kurnakov 相），其组成随着温度降低而收缩为 CuPd 和 Cu ₃ Pd 化学计量。随着温度升高，钯在金属间相中部分占据铜位。有序服从二阶相变以产生其理想化组成可被公式化为Cu ₂₁ Pd _{7 的相}。当处于固态时，系统在 390°C 和 30 at % Pd 下形成共析体和两个坐标分别为 510°C、15 at % Pd 和 600°C、40 at % Pd 的共析体。