Ultrahard BCC-AlCoCrFeNi bulk nanocrystalline high-entropy alloy formed by nanoscale diffusion-induced phase transition

Junjie Wang ¹Zongde Kou ¹Shu Fu ¹Shangshu Wu ¹Sinan Liu ¹Mengyang Yan ¹Zhiqiang Ren ¹Di Wang ²Zesheng You ¹Si Lan ¹Horst Hahn ³Xun-Li Wang ⁴Tao Feng¹

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作者信息

1. Herbert Gleiter Institute of Nanoscience,School of Material Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China
2. Institute of Nanotechnology,Karlsruhe Institute of Technology,Karlsruhe 76021,Germany
3. Herbert Gleiter Institute of Nanoscience,School of Material Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Institute of Nanotechnology,Karlsruhe Institute of Technology,Karlsruhe 76021,Germany
4. Department of Physics,City University of Hong Kong,Hong Kong,China;Center for Neutron Scattering,Shenzhen Research Institute,City University of Hong Kong,Shenzhen 518057,China
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Abstract

In the current work,the BCC-AlCoCrFeNi bulk nanocrystalline high-entropy alloy(nc-HEA)with ultra-high hardness was formed by nanoscale diffusion-induced phase transition in a nanocomposite.First,a dual-phase Al/CoCrFeNi nanocrystalline high-entropy alloy composite(nc-HEAC)was prepared by a laser source inert gas condensation equipment(laser-IGC).The as-prepared nc-HEAC is composed of well-mixed FCC-Al and FCC-CoCrFeNi nanocrystals.Then,the heat treatment was used to trigger the interdiffusion between Al and CoCrFeNi nanocrystals and form an FCC-AlCoCrFeNi phase.With the in-crease of the annealing temperature,element diffusion intensifies,and the AlCoCrFeNi phase undergoes a phase transition from FCC to BCC structure.Finally,the BCC-AlCoCrFeNi bulk nc-HEA with high Al con-tent(up to 50 at.％)was obtained for the first time.Excitingly,the nc-HEAC(Al-40％)sample exhibits an unprecedented ultra-high hardness of 1124 HV after annealing at 500℃for 1 h.We present a systematic investigation of the relationship between the microstructure evolution and mechanical properties dur-ing annealing,and the corresponding micro-mechanisms in different annealing stages are revealed.The enhanced nanoscale thermal diffusion-induced phase transition process dominates the mechanical per-formance evolution of the nc-HEACs,which opens a new pathway for the design of high-performance nanocrystalline alloy materials.

Key words

High-entropy alloy/Nanocrystalline/Composites/Diffusion-induced phase transition/Mechanical/Inert gas condensation

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基金项目

Karlsruhe Nano Micro Facility for the microstructure characterization()

Equipment Advance Research field Fund(80922010401)

National Key Research and Development Program of China(2021YFB3802800)

Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scat-tering Science and Technology()

Fundamental Research Funds for the Central Universities(30919011404)

Fundamental Research Funds for the Central Universities(30919011107)

国家自然科学基金(51871120)

国家自然科学基金(51571119)

Natural Sci-ence Foundation of Jiangsu Province(BK20200019)

Qing Lan project and the distin-guished professor project of Jiangsu province()

深圳市科创委项目(JCYJ20170413140446951)

Research Grants Council of Hong Kong(CityU 11215917)

This research used the resources of the Advanced Photon Source()

a US Department of En-ergy(DOE)Office of Science User Facility operated for the DOE Of-fice of Science by Argonne National Labor(DE-AC02-06CH11357)

出版年

2022

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)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量53

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