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Cryogenic strength improvement by utilizing room-temperature deformation twinning in a partially recrystallized VCrMnFeCoNi high-entropy alloy

Title
Cryogenic strength improvement by utilizing room-temperature deformation twinning in a partially recrystallized VCrMnFeCoNi high-entropy alloy
Authors
Jo, Y.H.Jung, S.Choi, W.M.Sohn, S.S.KIM, HYOUNG SEOPLEE, BYEONG JOOKim, N.J.Lee, S.
POSTECH Authors
KIM, HYOUNG SEOPLEE, BYEONG JOOKim, N.J.Lee, S.
Date Issued
2017-06
Publisher
Nature Publishing Group
Abstract
The excellent cryogenic tensile properties of the CrMnFeCoNi alloy are generally caused by deformation twinning, which is difficult to achieve at room temperature because of insufficient stress for twinning. Here, we induced twinning at room temperature to improve the cryogenic tensile properties of the CrMnFeCoNi alloy. Considering grain size effects on the critical stress for twinning, twins were readily formed in the coarse microstructure by cold rolling without grain refinement by hot rolling. These twins were retained by partial recrystallization and played an important role in improving strength, allowing yield strengths approaching 1 GPa. The persistent elongation up to 46% as well as the tensile strength of 1.3 GPa are attributed to additional twinning in both recrystallized and non-recrystallization regions. Our results demonstrate that non-recrystallized grains, which are generally avoided in conventional alloys because of their deleterious effect on ductility, can be useful in achieving high-strength high-entropy alloys. ? The Author(s) 2017.
Keywords
alloy; chromium; cobalt; iron; manganese; nickel; vanadium; alloy; cryogenic fluid; deformation; entropy; grain size; induced response; microstructure; recrystallization; temperature; tensile strength; Article; crystallization; deformation twinning; entropy; mechanical stress; mechanics; particle size; room temperature; tensile strength; thermodynamics
URI
https://oasis.postech.ac.kr/handle/2014.oak/51018
DOI
10.1038/ncomms15719
ISSN
2041-1723
Article Type
Article
Citation
Nature Communications, vol. 8, 2017-06
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이성학LEE, SUNG HAK
Dept of Materials Science & Enginrg
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