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

Open access
Jo, Y. H., Jung, S., Choi, W. M., Sohn, S. S., Kim, H. S., Lee, B. J., Kim, N. J., Lee, S.·2017·Nature Communications

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.

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Crossref · 10.1038/ncomms15719

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Metadata

Authors
Jo, Y. H., Jung, S., Choi, W. M., Sohn, S. S., Kim, H. S., Lee, B. J., Kim, N. J., & Lee, S.
Venue
Nature Communications
Published
2017-06-12
Volume
8
Issue
1
Pages
15719-15719
ISSN
2041-1723 (ISSN-L)
OpenAlex
W2623784365
Cited by
470
References
29
FWCI
24.47
Type
journal article
Language
en
Open access
gold

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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