High-entropy alloy strengthened by in situ formation of entropy-stabilized nano-dispersoids

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A significant increase in compressive yield strength of the Al0.3CoCrFeMnNi high-entropy alloy (HEA) from 979 MPa to 1759 MPa was observed upon the introduction of 3 vol.%Y2O3. The HEAs were processed using spark plasma sintering of mechanically alloyed powders. Transmission electron microscopy and atom probe tomography confirmed the presence of compositionally complex nano-dispersoids in theY(2)O(3)-added HEA. The significant increase in strength can be attributed to the nano-dispersoid strengthening coupled with grain refinement. Therefore, the in-situ formation of the compositionally complex nanosca le dispersoids during the alloy processing could be a novel approach to create entropy-stabilized oxide particles in strengthening of HEAs.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2018-09
Language
English
Article Type
Article
Keywords

MECHANICAL-PROPERTIES; THERMAL-STABILITY; FERRITIC ALLOYS; PHASE-STABILITY; SINGLE-PHASE; HALL-PETCH; OXIDE; MICROSTRUCTURE; EVOLUTION; AL0.3CUFECRNI2

Citation

SCIENTIFIC REPORTS, v.8

ISSN
2045-2322
DOI
10.1038/s41598-018-32552-6
URI
http://hdl.handle.net/10203/246156
Appears in Collection
NE-Journal Papers(저널논문)MS-Journal Papers(저널논문)
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