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Key Experiments and Thermodynamic Description of the Co-Nb-Ni System
Metallurgical and Materials Transactions A ( IF 2.8 ) Pub Date : 2020-09-15 , DOI: 10.1007/s11661-020-05963-2
Chenyang Zhou , Cuiping Guo , Jingbo Li , Changrong Li , Zhenmin Du

Equilibrated alloys were characterized using SEM/EDX and XRD methods to identify the Co-Nb-Ni phase equilibria at 1100 °C and 900 °C. The isothermal section at 1100 °C was re-constructed and the partial phase relationships at 900 °C were further validated. The crystal structure of the ternary compound τ was proved to be of the Mg3Cd type with Pearson symbol hP8 and space group P63/mmc. The addition of nickel can increase the phase stability of Co7Nb2. The Co-Nb, Ni-Nb, and Co-Nb-Ni systems were assessed using the CALPHAD (CALculation of PHAse Diagram) method. The present experimental and calculated results can be used as a reference for developing and designing Co/Ni-based intermetallics and superalloys.



中文翻译:

Co-Nb-Ni系统的关键实验和热力学描述

使用SEM / EDX和XRD方法对平衡合金进行表征,以鉴定1100°C和900°C下的Co-Nb-Ni相平衡。重建了1100°C下的等温截面,并进一步验证了900°C下的部分相关系。三元化合物τ的晶体结构为Mg 3 Cd型,具有Pearson符号hP 8和空间群P6 3 / mmc。镍的添加可以提高Co 7 Nb 2的相稳定性。使用CALPHAD(PHAse图的计算)方法评估了Co-Nb,Ni-Nb和Co-Nb-Ni系统。本实验和计算结果可作为开发和设计Co / Ni基金属间化合物和高温合金的参考。

更新日期:2020-10-05
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