Negative enthalpy alloys and local chemical ordering: a concept and route leading to synergy of strength and ductility

An，Zibing1; Yang，Tao2; Shi，Caijuan3; Mao，Shengcheng1; Wang，Lihua1; Li，Ang1; Li，Wei1; Xue，Xianmeng1; Sun，Ming1; Bai，Yifan1; He，Yapeng1; Ren，Fuzeng4; Lu，Zhouguang4; Yan，Ming4; Ren，Yang5; Liu，Chain Tsuan2; Zhang，Ze1,6; Han，Xiaodong1,4

2024-04-01

10.1093/nsr/nwae026

National Science Review   影响因子和分区

2095-5138

2053-714X

Solid solutions are ubiquitous in metals and alloys. Local chemical ordering (LCO) is a fundamental sub-nano/nanoscale process that occurs in many solid solutions and can be used as a microstructure to optimize strength and ductility. However, the formation of LCO has not been fully elucidated, let alone how to provide efficient routes for designing LCO to achieve synergistic effects on both superb strength and ductility. Herein, we propose the formation and control of LCO in negative enthalpy alloys. With engineering negative enthalpy in solid solutions, genetic LCO components are formed in negative enthalpy refractory high-entropy alloys (RHEAs). In contrast to conventional ‘trial-and-error’ approaches, the control of LCO by using engineering negative enthalpy in RHEAs is instructive and results in superior strength (1160 MPa) and uniform ductility (24.5%) under tension at ambient temperature, which are among the best reported so far. LCO can promote dislocation cross-slip, enhancing the interaction between dislocations and their accumulation at large tensile strains; sustainable strain hardening can thereby be attained to ensure high ductility of the alloy. This work paves the way for new research fields on negative enthalpy solid solutions and alloys for the synergy of strength and ductility as well as new functions.

dislocation ductility local chemical ordering negative enthalpy alloys strength

SCI ; EI

英语

通讯

2-s2.0-85186068120

Scopus

1.Beijing Key Lab of Microstructure and Property of Advanced Materials,College of Materials Science & Engineering,Beijing University of Technology,Beijing,100124,China
2.Department of Materials Science and Engineering,City University of Hong Kong,Hong Kong,Hong Kong
3.Key Laboratory of Partial Acceleration Physics & Technology,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing,100049,China
4.Department of Materials Science & Engineering,Southern University of Science and Technology,Shenzhen,518055,China
5.Department of Physics,City University of Hong Kong,Hong Kong,Hong Kong
6.State Key Laboratory of Silicon Materials,Department of Materials Science and Engineering,Zhejiang University,Hangzhou,310058,China

An，Zibing,Yang，Tao,Shi，Caijuan,et al. Negative enthalpy alloys and local chemical ordering: a concept and route leading to synergy of strength and ductility[J]. National Science Review,2024,11(4).

An，Zibing.,Yang，Tao.,Shi，Caijuan.,Mao，Shengcheng.,Wang，Lihua.,...&Han，Xiaodong.(2024).Negative enthalpy alloys and local chemical ordering: a concept and route leading to synergy of strength and ductility.National Science Review,11(4).

An，Zibing,et al."Negative enthalpy alloys and local chemical ordering: a concept and route leading to synergy of strength and ductility".National Science Review 11.4(2024).