Key Experiments and Thermodynamic Description of the Co-Nb-Ni System

Chenyang Zhou; Cuiping Guo; Jingbo Li; Changrong Li; Zhenmin Du

doi:10.1007/s11661-020-05963-2

Key Experiments and Thermodynamic Description of the Co-Nb-Ni System

Chenyang Zhou, Cuiping Guo^*, Jingbo Li, Changrong Li, Zhenmin Du^*

^*Corresponding author for this work

School of Material Science and Engineering

University of Science and Technology Beijing

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	5892-5911
Number of pages	20
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	51
Issue number	11
DOIs	https://doi.org/10.1007/s11661-020-05963-2
Publication status	Published - 1 Nov 2020

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title = "Key Experiments and Thermodynamic Description of the Co-Nb-Ni System",

abstract = "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.",

author = "Chenyang Zhou and Cuiping Guo and Jingbo Li and Changrong Li and Zhenmin Du",

note = "Publisher Copyright: {\textcopyright} 2020, The Minerals, Metals \& Materials Society and ASM International.",

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doi = "10.1007/s11661-020-05963-2",

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T1 - Key Experiments and Thermodynamic Description of the Co-Nb-Ni System

AU - Zhou, Chenyang

AU - Guo, Cuiping

AU - Li, Jingbo

AU - Li, Changrong

AU - Du, Zhenmin

PY - 2020/11/1

Y1 - 2020/11/1

N2 - 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.

AB - 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.

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Key Experiments and Thermodynamic Description of the Co-Nb-Ni System

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