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

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

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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.

negative enthalpy alloyslocal chemical orderingstrengthductilitydislocation

Zibing An、Tao Yang、Caijuan Shi、Shengcheng Mao、Lihua Wang、Ang Li、Wei Li、Xianmeng Xue、Ming Sun、Yifan Bai、Yapeng He、Fuzeng Ren、Zhouguang Lu、Ming Yan、Yang Ren、Chain-Tsuan Liu、Ze Zhang、Xiaodong Han

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Beijing Key Lab of Microstructure and Property of Advanced Materials,College of Materials Science &Engineering,Beijing University of Technology,Beijing 100124,China

Department of Materials Science and Engineering,City University of Hong Kong,Hong Kong,China

Key Laboratory of Partial Acceleration Physics& Technology,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China

Department of Materials Science &Engineering,Southern University of Science and Technology,Shenzhen 518055,China

Department of Physics,City University of Hong Kong,Hong Kong,China

State Key Laboratory of Silicon Materials,Department of Materials Science and Engineering,Zhejiang University,Hangzhou 310058,China

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国家重点研发计划Beijing Outstanding Young Scientists ProjectsBasic Science Center Program for Multiphase Evolution in Hypergravity of the National Natural Science Foundation of China国家自然科学基金国家自然科学基金国家重点基础研究发展计划(973计划)Beijing Nova ProgramBeijing Municipal Education Commission Project中国博士后科学基金Overseas Expertise Introduction Project for Discipline Innovation('111'Project)

2021YFA1200201BJJWZYJH012019100050185198810152071003918602022020YFA0406101Z211100002121170PXM2020_014204_0000212022M720311DB18015

2024

10.1093/nsr/nwae026

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ISSN：
年,卷(期)：2024.11(4)
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