Ultra-strong and ductile precipitation-strengthened high entropy alloy with 0.5％Nb addition produced by laser additive manufacturing

Wei Zhang ¹Ali Chabok ¹Hui Wang ²Jiajia Shen ³J.P.Oliveira ³Shaochuan Feng ⁴Nobert Schell ⁵Bart J.Kooi ²Yutao Pei¹

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作者信息

1. Advanced Production Engineering,Engineering and Technology Institute Groningen,Faculty of Science and Engineering,University of Groningen,Nijenborgh 4,9747 AG,the Netherlands
2. Nanostructured Materials and Interfaces,Zernike Institute for Advanced Materials,Faculty of Science and Engineering,University of Groningen,Nijenborgh 4,9747 AG,the Netherlands
3. UNIDEMI,Department of Mechanical and Industrial Engineering,NOVA School Science and Technology,Universidade NOVA de Lisboa,Caparica 2829-516,Portugal;CENIMAT/I3N,Department of Materials Science,NOVA School of Science and Technology,Universidade NOVA de Lisboa,2829-516 Caparica,Portugal
4. School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China
5. Institute of Materials Physics,Helmholtz-Zentrum Hereon,Max-Planck-Str.1,Geesthacht,D-21502,Germany
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Abstract

Achieving a superior strength-ductility combination for fcc single-phase high entropy alloys(HEAs)is challenging.The present work investigates the in-situ synthesis of Fe49.5Mn30CoioCr10Co.5 interstitial solute-strengthened HEA containing 0.5 wt.％Nb(hereafter referred to as iHEA-Nb)using laser melt-ing deposition(LMD),aiming at simultaneously activating multiple strengthening mechanisms.The effect of Nb addition on the microstructure evolution,mechanical properties,strengthening and deformation mechanisms of the as-deposited iHEA-Nb samples was comprehensively evaluated.Multiple levels of het-erogeneity were observed in the LMD-deposited microstructure,including different grain sizes,cellular subgrain structures,various carbide precipitates,as well as elemental segregation.The incorporation of Nb atoms with a large radius leads to lattice distortion,reduces the average grain size,and increases the types and fractions of carbides,aiding in promoting solid solution strengthening,grain boundary strengthening,and precipitation strengthening.Tensile test results show that the Nb addition significantly increases the yield strength and ultimate tensile strength of the iHEA to 1140 and 1450 MPa,respectively,while maintaining the elongation over 30％.Deformation twins were generated in the tensile deformed samples,contributing to the occurrence of twinning-induced plasticity.This outstanding combination of strength and ductility exceeds that for most additively manufactured HEAs reported to date,demon-strating that the present in situ alloying strategy could provide significant advantages for developing and tailoring microstructures and balancing the mechanical properties of HEAs while avoiding conventional complex thermomechanical treatments.In addition,single-crystal micropillar compression tests revealed that although the twining activity is reduced by the Nb addition to the iHEA,the micromechanical prop-erties of grains with different orientations were significantly enhanced.

Key words

Laser additive manufacturing/High entropy alloy/In situ alloying/Precipitation strengthening/Deformation mechanism/Mechanical properties

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基金项目

China Scholarship Council for her PhD grant(CSC 201906250212)

JPO and JS acknowledge Funda??o para a Ciência e a Tecnologia(FCT-MCTES)for its financial support via the project UID/00667/2020()

national funds from FCT-Funda??o para a Ciência e a Tecnologia,I.P.,in the scope of the projects of the Associate Laboratory Ins(LA/P/0037/2020)

national funds from FCT-Funda??o para a Ciência e a Tecnologia,I.P.,in the scope of the projects of the Associate Laboratory Ins(UIDP/50025/2020)

national funds from FCT-Funda??o para a Ciência e a Tecnologia,I.P.,in the scope of the projects of the Associate Laboratory Ins(UIDB/50025/2020)

China Scholarship Council for her PhD grant(CSC 201808320394)

National Natural Science Foundation of China(52105318)

National Natural Science Foundation of China(52311530340)

"Chunhui Plan"Collaborative Research Project of the Ministry of Education,China(HZKY20220023)

出版年

2024

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCD

影响因子：0.657

ISSN：1005-0302

参考文献量111

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