The ternary phase diagram Al–Ge–Ni was investigated between 0 and 50 at.% Ni by a combination of differential thermal analysis (DTA), powder- and single-crystal X-ray diffraction (XRD), metallography and electron probe microanalysis (EPMA). Ternary phase equilibria and accurate phase compositions of the equilibrium phases were determined within two partial isothermal sections at 400 and 700 °C, respectively. The two binary intermediate phases AlNi and Al3Ni2 were found to form extended solid solutions with Ge in the ternary. Three new ternary phases were found to exist in the Ni-poor part of the phase diagram which were designated as τ1 (oC24, CoGe2-type), τ2 (at approximately Al67.5Ge18.0Ni14.5) and τ3 (cF12, CaF2-type). The ternary phases show only small homogeneity ranges. While τ1 was investigated by single crystal X-ray diffraction, τ2 and τ3 were identified from their powder diffraction pattern. Ternary phase reactions and melting behaviour were studied by means of DTA. A total number of eleven invariant reactions could be derived from these data, which are one ternary eutectic reaction, six transition reactions, three ternary peritectic reactions and one maximum. Based on the measured DTA values three vertical sections at 10, 20 and 35 at.% Ni were constructed. Additionally, all experimental results were combined to a ternary reaction scheme (Scheil diagram) and a liquidus surface projection.

中文翻译：

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Al-Ge-Ni 系统中贫 Ni 部分的相平衡和结构研究

通过差热分析 (DTA)、粉末和单晶 X 射线衍射 (XRD)、金相学和电子探针微量分析相结合，研究了 0 和 50 at.% Ni 之间的三元相图 Al-Ge-Ni。 EPMA）。分别在 400 和 700 °C 的两个部分等温段内确定了三元相平衡和平衡相的准确相组成。发现两个二元中间相 AlNi 和 Al3Ni2 在三元中与 Ge 形成扩展固溶体。在相图的贫镍部分发现了三个新的三元相，它们被指定为 τ1（oC24，CoGe2 型）、τ2（大约为 Al67.5Ge18.0Ni14.5）和 τ3（cF12、CaF2-类型）。三元相仅显示小的均质范围。虽然通过单晶 X 射线衍射研究了 τ1，τ2 和 τ3 从它们的粉末衍射图谱中确定。通过 DTA 研究了三元相反应和熔化行为。从这些数据可以推导出总共十一种不变反应，它们是一种三元共晶反应、六种转变反应、三种三元包晶反应和一种最大值。根据测得的 DTA 值，构建了 10、20 和 35 at.% Ni 的三个垂直部分。此外，所有实验结果都结合到三元反应方案（Scheil 图）和液相线表面投影中。三个三元包晶反应和一个最大值。根据测得的 DTA 值，构建了 10、20 和 35 at.% Ni 的三个垂直部分。此外，所有实验结果都结合到三元反应方案（Scheil 图）和液相线表面投影中。三个三元包晶反应和一个最大值。根据测得的 DTA 值，构建了 10、20 和 35 at.% Ni 的三个垂直部分。此外，所有实验结果都结合到三元反应方案（Scheil 图）和液相线表面投影中。