Thermodynamic Assessment of the Fe–Nb–Si System

J. Min. Metall. Sect. B-Metall., 57 (3) (2021) 331-340 DOI:10.2298/JMMB191220029J
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Available online 27 April 2021
(Received 20 December 2019; Accepted 21 April 2021)
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Abstract

Nb–Si based alloys have drawn continuously increasing attention due to their excellent high-temperature mechanical properties. The addition of element Fe could improve their poor high-temperature oxidation resistance which largely restricts their application. With the aim to study the effect of Fe addition on the Nb–Si system and to design appropriate alloy composition, the Fe–Nb–Si ternary system was thermodynamically investigated using the CALPHAD (CALculation of PHAse Diagrams) approach aided with the formation enthalpies for ternary compounds at 0 K computed via ab initio calculations. A self-consistent thermodynamic description of the Fe–Nb–Si system was obtained in this work. Key isothermal sections and liquidus projection were presented, and the calculation results showed a good agreement with available experimental data.

Keywords: Fe–Nb–Si; Phase diagram; CALPHAD; Ab initio calculations
Correspondence Address:
F. Li*, S.-R. Li**, K. Xu***,
a Shanghai Key Laboratory for High Temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai, China; b State Key Laboratory of Special Rare Metal Materials, Northwest Rare Metal Materials Research Institute Ningxia Co. Ltd., Shizuishan, China; c Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, China;,
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