期刊
SCIENCE ADVANCES
卷 7, 期 34, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abi4404
关键词
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资金
- National Natural Science Foundation of China [U1832203, 11975202]
- National Key Research and Development Program of China [2017YFA0403400]
- Natural Science Foundation of Zhejiang Province [LY15E010003, LZ20E010002]
- Fundamental Research Funds for the Central Universities
High-entropy alloys (HEAs) offer promising property combinations and can maintain excellent strength-ductility synergy over a wide temperature range by utilizing multiple deformation mechanisms to enhance material performance.
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 (similar to 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.
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