A dual-phase alloy with ultrahigh strength-ductility synergy over a wide temperature range

Raymond Kwesi Nutor; Qingping Cao; Ran Wei; Qingmei Su; Gaohui Du; Xiaodong Wang; Fushan Li; Dongxian Zhang; Jian-Zhong Jiang

doi:10.1126/sciadv.abi4404

A dual-phase alloy with ultrahigh strength-ductility synergy over a wide temperature range

Sci Adv. 2021 Aug 20;7(34):eabi4404. doi: 10.1126/sciadv.abi4404. Print 2021 Aug.

Authors

Raymond Kwesi Nutor¹, Qingping Cao², Ran Wei³, Qingmei Su⁴, Gaohui Du⁴, Xiaodong Wang¹, Fushan Li³, Dongxian Zhang^{1

5}, Jian-Zhong Jiang²

Affiliations

¹ International Center for New-Structured Materials (ICNSM), State Key Laboratory of Silicon Materials, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China.
² International Center for New-Structured Materials (ICNSM), State Key Laboratory of Silicon Materials, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China. jiangjz@zju.edu.cn caoqp@zju.edu.cn.
³ School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, People's Republic of China.
⁴ Materials Institute of Atomic and Molecular Science, Shaanxi University of Science and Technology, Xi'an 710021, People's Republic of China.
⁵ State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, People's Republic of China.

Abstract

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·cm³/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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