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  Solving the strength-ductility tradeoff in the medium-entropy NiCoCr alloy via interstitial strengthening of carbon

Shang, Y., Wu, Y., He, J., Zhu, X., Liu, S., Huang, H., et al. (2019). Solving the strength-ductility tradeoff in the medium-entropy NiCoCr alloy via interstitial strengthening of carbon. Intermetallics, 106, 77-87. doi:10.1016/j.intermet.2018.12.009.

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 Creators:
Shang, Yuanyuan1, Author              
Wu, Yuan1, Author              
He, Junyang2, Author              
Zhu, Xiangyu3, Author              
Liu, Shaofei3, Author              
Huang, Hailong3, Author              
An, Ke4, Author              
Chen, Yan5, Author              
Jiang, Suihe1, Author              
Wang, Hui1, Author              
Liu, Xingjiang Jun3, Author              
Lu, Zhaoping1, Author              
Affiliations:
1State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China, ou_persistent22              
2High-Entropy Alloys, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_3010672              
3State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China, ou_persistent22              
4Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, TN, USA, ou_persistent22              
5Chemical and Engineering Materials Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA, ou_persistent22              

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Free keywords: Carbides; Chromium alloys; Cobalt alloys; Ductility; Entropy; Fracture toughness; Mechanical properties; Neutron diffraction; Stacking faults; Strain hardening; Ternary alloys; Twinning, Deformation twinning; Dislocation multiplication; High entropy alloys; Plastic instabilities; Solid solution strengthening; Stacking fault energies; Strength and ductilities; Twinning structures, Carbon
 Abstract: Interstitial solid strengthening is an effective strategy to harden metallic materials, however, it usually deteriorates the ductility. Here, we report that addition of carbon into the medium-entropy NiCoCr alloy successfully enhances the strength at no expense of ductility. It was found that up to 0.75 at. carbon was completely solid-solutionized in (NiCoCr) 100-x C x (x = 0, 0.10, 0.25, 0.50 and 0.75 at.) without formation of any carbides. With the increase of carbon content from 0 to 0.75 at., the yield and fracture strength were increased from 242 to 347 MPa to 727 and 862 MPa, respectively, whilst the ductility kept as high as about 75. It is noteworthy that the integral of the stress over strain for the alloy with 0.75 at. carbon reaches a value of 59 GPa , surmounting the level of many reported multi-principal elements alloys. Our analysis indicates that carbon addition increases stacking fault energy, thus delaying occurrence of twinning and decreasing the thickness of twin lamellas. At the early deformation stage, carbon decreases the stress localization and stimulates dislocation multiplication. After occurrence of deformation twinning, finer twinning structure in the alloys added with carbon not only can obstacle and trigger more dislocations, but also transfer plastic deformation more efficiently, thus promoting the twinning process, postponing the plastic instability and eventually giving rise to a more pronounced work-hardening. Our results not only have important implications for understanding the solid solution strengthening mechanism in medium-entropy alloys, but also shed lights on developing advanced metallic alloys with a unique combination of strength and ductility. © 2018 Elsevier Ltd

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Language(s): eng - English
 Dates: 2019-03
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.intermet.2018.12.009
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Title: Intermetallics
  Abbreviation : Intermetallics
Source Genre: Journal
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Publ. Info: Barking, Essex, England : Elsevier
Pages: - Volume / Issue: 106 Sequence Number: - Start / End Page: 77 - 87 Identifier: ISSN: 0966-9795
CoNE: https://pure.mpg.de/cone/journals/resource/954925582175