Open AccessA dual-phase alloy with ultrahigh strength-ductility synergy over a wide temperature range
Author(s) -
Raymond Kwesi Nutor,
Q.P. Cao,
Ran Wei,
Qingmei Su,
Gaohui Du,
Xiaodong Wang,
Fushan Li,
Dongxian Zhang,
Jianzhong Jiang
Publication year - 2021
Publication title -
science advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.928
H-Index - 146
ISSN - 2375-2548
DOI - 10.1126/sciadv.abi4404
Subject(s) - materials science , alloy , ductility (earth science) , phase (matter) , range (aeronautics) , dual (grammatical number) , atmospheric temperature range , composite material , chemistry , physics , creep , art , literature , organic chemistry , meteorology
High-entropy alloys (HEAs), as an emerging class of materials, have pointed a pathway in developing alloys with interesting property combinations. Although they are not exempted from the strength-ductility trade-off, they present a standing chance in overcoming this challenge. Here, we report results for a precipitation-strengthening strategy, by tuning composition to design a CoNiV-based face-centered cubic/B2 duplex HEA. This alloy sustains ultrahigh gigapascal-level tensile yield strengths and excellent ductility from cryogenic to elevated temperatures. The highest specific yield strength (~150.2 MPa·cm 3 /g) among reported ductile HEAs is obtained. The ability of the alloy presented here to sustain this excellent strength-ductility synergy over a wide temperature range is aided by multiple deformation mechanisms i.e., twins, stacking faults, dynamic strain aging, and dynamic recrystallization. Our results open the avenue for designing precipitation-strengthened lightweight HEAs with advanced strength-ductility combinations over a wide service temperature range.