Haas Sebastian, Manzoni Anna M, Krieg Fabian, Glatzel Uwe
Metals and Alloys, University Bayreuth, 95440 Bayreuth, Germany.
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 14109 Berlin, Germany.
Entropy (Basel). 2019 Feb 12;21(2):169. doi: 10.3390/e21020169.
High entropy or compositionally complex alloys provide opportunities for optimization towards new high-temperature materials. Improvements in the equiatomic alloy AlCoCrCuFeNi (at.%) led to the base alloy for this work with the chemical composition AlCoCrFeNiTi (at.%). Characterization of the beneficial particle-strengthened microstructure by scanning electron microscopy (SEM) and observation of good mechanical properties at elevated temperatures arose the need of accomplishing further optimization steps. For this purpose, the refractory metals hafnium and molybdenum were added in small amounts (0.5 and 1.0 at.% respectively) because of their well-known positive effects on mechanical properties of Ni-based superalloys. By correlation of microstructural examinations using SEM with tensile tests in the temperature range of room temperature up to 900 °C, conclusions could be drawn for further optimization steps.
高熵合金或成分复杂的合金为新型高温材料的优化提供了机会。等原子合金AlCoCrCuFeNi（原子百分比）的改进产生了本研究的基础合金，其化学成分为AlCoCrFeNiTi（原子百分比）。通过扫描电子显微镜（SEM）对有益的颗粒强化微观结构进行表征，并观察到其在高温下具有良好的力学性能，这就需要进一步完成优化步骤。为此，添加了少量（分别为0.5和1.0原子百分比）的难熔金属铪和钼，因为它们对镍基高温合金的力学性能具有众所周知的积极影响。通过将使用SEM进行的微观结构检查与室温至900°C温度范围内的拉伸试验相关联，可以得出进一步优化步骤的结论。
