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  Towards stronger high-entropy alloy by nanoprecipitation-hardened ultrafine-/nano-grains

Xiao, Q., Liang, Y.-J., Chen, Q., Sha, G., Lu, W., Guo, W., et al. (2020). Towards stronger high-entropy alloy by nanoprecipitation-hardened ultrafine-/nano-grains. Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 787: 139474. doi:10.1016/j.msea.2020.139474.

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 Creators:
Xiao, Qian1, Author
Liang, Yao-Jian1, Author
Chen, Qi2, Author
Sha, Gang2, Author
Lu, Wenjun3, Author              
Guo, Wenqi3, Author              
Wang, Lu1, Author
Wang, Fuchi1, Author
Cai, Hongnian1, Author
Xue, Yunfei1, Author
Affiliations:
1School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, PR China, ou_persistent22              
2Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing, 210094, PR China, ou_persistent22              
3Advanced Transmission Electron Microscopy, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863399              

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Free keywords: Entropy; Hardening; High-entropy alloys; Strengthening (metal); Tensile strength, Bulk materials; Combined hardenings; High-tensile strength; Nano precipitations; Nanoprecipitates; Pinning effects; Severe plastic deformations; Ultra fine grain, Precipitation (chemical)
 Abstract: Every strengthening/hardening method has its own limit. However, it is difficult to couple multiple extreme hardening in a bulk material, especially for highly strengthened ones. Here we demonstrate a strategy to further harden an ultrastrong precipitation-hardened high entropy alloy (HEA) with ultrafine-grain (UFG)/nanograin (NG) bands. These UFG/NG bands with nanoprecipitates were obtained by combining local severe plastic deformation (SPD) from cryogenic rolling and the pinning effect of precipitates during recrystallization. We found that the bands, with combined hardening of NGs and nanoprecipitates, provide an amazing yield strength of ~2.8 GPa and an ultrahigh hardness of ~9.7 GPa. Such nanoprecipitation-hardened UFG/NG bands in the bulk HEA contribute to an extra strengthening close to 300 MPa and an extremely high tensile strength of more than 2.2 GPa. This research presents a possibility for obtaining NG structure in bulk metals which will open new avenues for developing stronger alloys. © 2020 Elsevier B.V.

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Language(s): eng - English
 Dates: 2020-06-10
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.msea.2020.139474
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Title: Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing
  Abbreviation : Mater. Sci. Eng. A: Struct. Mater. Prop. Microstruct. Process.
Source Genre: Journal
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Affiliations:
Publ. Info: Amsterdam : Elsevier B.V.
Pages: - Volume / Issue: 787 Sequence Number: 139474 Start / End Page: - Identifier: ISSN: 0921-5093
CoNE: https://pure.mpg.de/cone/journals/resource/954928498465_1