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  Twin boundary-assisted precipitation of sigma phase in a high-entropy alloy

Hou, J., Li, J., & Lu, W. (2021). Twin boundary-assisted precipitation of sigma phase in a high-entropy alloy. Materials Letters, 300: 130198. doi:10.1016/j.matlet.2021.130198.

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 Creators:
Hou, Junhua1, Author              
Li, Jianjun2, Author              
Lu, Wenjun3, 4, Author              
Affiliations:
1Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, China, ou_persistent22              
2College of Mechanical and Electrical Engineering, Central South University, Changsha, Hunan 410083, China, ou_persistent22              
3Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, 518055 China, ou_persistent22              
4High-Entropy Alloys, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_3010672              

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Free keywords: Electron microscopes; Entropy; Free energy; Gibbs free energy; High-entropy alloys; Microstructure; Precipitation (chemical), 9R structures; Adjacent matrix; Free-energy difference; High entropy alloys; High-temperature annealing; Incoherent twin; Polycrystalline; Sigma phase; Sigma phase formation; Twin boundaries, Electron microscopy
 Abstract: We reveal a novel phenomenon, i.e., twin boundary-assisted precipitation of sigma phase in a non-equiatomic quinary high-entropy alloy (HEA) upon high-temperature annealing. According to systematic electron microscope studies, sigma phase is frequently observed at incoherent twin boundaries where 9R structures are usually formed. The diffusion of solutes and subsequent precipitation of sigma phase are mainly driven by the Gibbs free energy difference between the 9R structure and the adjacent matrix. The findings provide a fundamental understanding for the nature of sigma phase formation in polycrystalline HEAs. © 2021

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 Dates: 2021-10-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.matlet.2021.130198
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Title: Materials Letters
  Abbreviation : Mater. Lett.
Source Genre: Journal
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Publ. Info: Amsterdam : North-Holland
Pages: - Volume / Issue: 300 Sequence Number: 130198 Start / End Page: - Identifier: ISSN: 0167-577X
CoNE: https://pure.mpg.de/cone/journals/resource/954925483654