In this work, alloys composed of the 5 base-elements Al, Cr, Fe, Ni and Ti and elements in minor amounts were produced by arc melting and powder metallurgy. The alloys’ phase distribution was analyzed via high energy X-ray diffraction (HEXRD), neutron diffraction and electron backscatter diffraction (EBSD). The two studied compositions have low concentrations of the elements Al and Ti, medium concentrations of the elements Cr and Fe and high amounts of Ni (chemical composition in at.-%: Al10Cr20Fe20Ni40Ti5, Al10Cr20Fe20Ni35Ti10). The goal then was to analyze the microstructure of these compositions at elevated temperatures in dependence of their chemical composition and the production method. Analysis of both compositions show the presence of B2-phases, L1₂-phases, Full Heusler-phases (H_L2₁), C14_Laves-phase and σ-phase. The combination of dilatometric tests with microstructure analysis via HEXRD and neutron diffraction gives the possibility of observing changes in phase amounts in dependence of temperature. A quantification of phase amounts in the compositions is supported by thermodynamic calculations of stable phases, applying the calculation-of-phase-diagrams (CALPHAD) method within the software Thermocalc. Due to its detrimental influence on ductility the existence of σ-phase is undesired in nickel-chromium-iron alloys and hence σ-phase precipitation with an associated dissolution of the phases B2 and L1₂ at elevated temperatures was studied in detail.

在这项工作中，由 5 种基本元素 Al、Cr、Fe、Ni 和 Ti 和少量元素组成的合金是通过电弧熔炼和粉末冶金生产的。通过高能 X 射线衍射 (HEXRD)、中子衍射和电子背散射衍射 (EBSD) 分析合金的相分布。所研究的两种成分具有低浓度的元素 Al 和 Ti、中等浓度的元素 Cr 和 Fe 以及大量的 Ni（以原子百分比表示的化学成分：Al10Cr20Fe20Ni40Ti5、Al10Cr20Fe20Ni35Ti10）。然后的目标是分析这些组合物在升高的温度下的微观结构，这取决于它们的化学成分和生产方法。两种成分的分析表明存在 B2 相、L1 ₂相、全赫斯勒相 (H_L2 ₁)、C14_Laves 相和σ相。膨胀测试与通过 HEXRD 和中子衍射进行的微观结构分析相结合，可以观察相量随温度的变化。组合物中相量的量化由稳定相的热力学计算支持，应用软件 Thermocalc 中的相图计算 (CALPHAD) 方法。由于其对延展性的不利影响，在镍-铬-铁合金中不希望存在σ相，因此详细研究了σ相析出以及相B2和L1 ₂在高温下的相关溶解。