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  Effects of cryogenic temperature on tensile and impact properties in a medium-entropy VCoNi alloy

Yang, D.-C., Jo, Y.-H., Ikeda, Y., Körmann, F., & Sohn, S. S. (2021). Effects of cryogenic temperature on tensile and impact properties in a medium-entropy VCoNi alloy. Journal of Materials Science & Technology, 90, 159-167. doi:10.1016/j.jmst.2021.02.034.

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 Creators:
Yang, Dae-Cheol1, Author              
Jo, Yong-Hee2, Author              
Ikeda, Yuji3, Author              
Körmann, Fritz4, 5, Author              
Sohn, Seok Su1, Author              
Affiliations:
1Department of Materials Science and Engineering, Korea University, Seoul, 02841, South Korea, ou_persistent22              
2Metallic Materials Division, Korea Institute of Materials Science, Changwon, 51508, South Korea, ou_persistent22              
3Institute of Materials Science, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany, ou_persistent22              
4Computational Phase Studies, Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863341              
5Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands, ou_persistent22              

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Free keywords: Chromium alloys; Cryogenics; Deformation; Fracture toughness; Grain boundaries; High strength alloys; Iron alloys; Manganese alloys; Strain hardening; Strain rate; Temperature distribution; Ternary alloys; Twinning; Vanadium alloys; Yield stress, Charpy impact toughness; Deformation localization; Homogeneous distribution; Stacking fault energies; Strength and ductilities; Strength and toughness; Temperature dependence; Tensile and impact properties, Cobalt alloys
 Abstract: Multi-principal element alloys usually exhibit outstanding strength and toughness at cryogenic temperatures, especially in CrMnFeCoNi and CrCoNi alloys. These remarkable cryogenic properties are attributed to the occurrence of deformation twins, and it is envisaged that a reduced stacking fault energy (SFE) transforms the deformation mechanisms into advantageous properties at cryogenic temperatures. A recently reported high-strength VCoNi alloy is expected to exhibit further notable cryogenic properties. However, no attempt has been made to investigate the cryogenic properties in detail as well as the underlying deformation mechanisms. Here, the effects of cryogenic temperature on the tensile and impact properties are investigated, and the underlying mechanisms determining those properties are revealed in terms of the temperature dependence of the yield strength and deformation mechanism. Both the strength and ductility were enhanced at 77 K compared to 298 K, while the Charpy impact toughness gradually decreased with temperature. The planar dislocation glides remained unchanged at 77 K in contrast to the CrMnFeCoNi and CrCoNi alloys resulting in a relatively constant and slightly increasing SFE as the temperature decreased, which is confirmed via ab initio simulations. However, the deformation localization near the grain boundaries at 298 K changed into a homogeneous distribution throughout the whole grains at 77 K, leading to a highly sustained strain hardening rate. The reduced impact toughness is directly related to the decreased plastic zone size, which is due to the reduced dislocation width and significant temperature dependence of the yield strength. © 2021

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Language(s): eng - English
 Dates: 2021-11-10
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.jmst.2021.02.034
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Project name : This work was financially supported by the National Research Foundation of Korea (NRF- 2020R1C1C1003554 ), the Creative Materials Discovery Program of the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF- 2016M3D1A1023384 ), and the Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government (MOTIE, P0002019 , The Competency Development Program for Industry Specialist). Fritz Körmann gratefully acknowledges support from the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) under the priority programme 2006 “CCA–HEA".
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Title: Journal of Materials Science & Technology
  Other : J. Mater. Sci. Technol.
Source Genre: Journal
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Publ. Info: Shenyang, China : Editorial Board of Journal of Materials Science and Technology
Pages: - Volume / Issue: 90 Sequence Number: - Start / End Page: 159 - 167 Identifier: ISSN: 1005-0302
CoNE: https://pure.mpg.de/cone/journals/resource/954925584235