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Open AccessArticle

Elemental Phase Partitioning in the γ-γ″ Ni2CoFeCrNb0.15 High Entropy Alloy

by Bin Han 1,*, Jie Wei 1, Feng He 1,2, Da Chen 1, Zhi Jun Wang 2, Alice Hu 1,3,4, Wenzhong Zhou 1,3 and Ji Jung Kai 1,3,*
1
Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China
2
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
3
Centre for Advanced Nuclear Safety and Sustainable Development, City University of Hong Kong, Hong Kong, China
4
City University of Hong Kong, Shenzhen Research Institute, Shenzhen 518057, China
*
Authors to whom correspondence should be addressed.
Entropy 2018, 20(12), 910; https://doi.org/10.3390/e20120910
Received: 28 October 2018 / Revised: 15 November 2018 / Accepted: 16 November 2018 / Published: 28 November 2018
(This article belongs to the Special Issue New Advances in High-Entropy Alloys)
The partitioning of the alloying elements into the γ″ nanoparticles in a Ni2CoFeCrNb0.15 high entropy alloy was studied by the combination of atom probe tomography and first-principles calculations. The atom probe tomography results show that the Co, Fe, and Cr atoms incorporated into the Ni3Nb-type γ″ nanoparticles but their partitioning behaviors are significantly different. The Co element is much easier to partition into the γ″ nanoparticles than Fe and Cr elements. The first-principles calculations demonstrated that the different partitioning behaviors of Co, Fe and Cr elements into the γ″ nanoparticles resulted from the differences of their specific chemical potentials and bonding states in the γ″ phase. View Full-Text
Keywords: high entropy alloy; gamma double prime nanoparticles; elemental partitioning; atom probe tomography; first-principles calculations high entropy alloy; gamma double prime nanoparticles; elemental partitioning; atom probe tomography; first-principles calculations
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MDPI and ACS Style

Han, B.; Wei, J.; He, F.; Chen, D.; Wang, Z.J.; Hu, A.; Zhou, W.; Kai, J.J. Elemental Phase Partitioning in the γ-γ″ Ni2CoFeCrNb0.15 High Entropy Alloy. Entropy 2018, 20, 910.

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