材料科学技术(英文版)2021，Vol.89Issue(30) ：88-96.

A precipitate-free AlCoFeNi eutectic high-entropy alloy with strong strain hardening

Peijian Shi Yi Li Yuebo Wen Yiqi Li Yan Wang Weili Ren Tianxiang Zheng Yifeng Guo Long Hou Zhe Shen Ying Jiang Jianchao Peng Pengfei Hu Ningning Liang Qingdong Liu Peter K.Liaw Yunbo Zhong
材料科学技术(英文版)2021，Vol.89Issue(30) ：88-96.
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A precipitate-free AlCoFeNi eutectic high-entropy alloy with strong strain hardening

Peijian Shi 1Yi Li 1Yuebo Wen 1Yiqi Li 1Yan Wang 1Weili Ren 1Tianxiang Zheng 1Yifeng Guo 1Long Hou 1Zhe Shen 1Ying Jiang 2Jianchao Peng 3Pengfei Hu 3Ningning Liang 4Qingdong Liu 5Peter K.Liaw 6Yunbo Zhong1
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作者信息

  • 1. State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering,Shanghai University,Shanghai,200444,China
  • 2. Materials Genome Institute,Shanghai University,Shanghai,200444,China
  • 3. Laboratory for Microstructures,Shanghai University,Shanghai,200444,China
  • 4. School of Materials Science and Engineering,Nanjing University of Science and Technology,Jiangsu,210094,China
  • 5. Institute of Materials Modification and Modelling,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai,200240,China
  • 6. Department of Materials Science and Engineering,The University of Tennessee,Knoxville,TN37996,USA
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Abstract

Over recent years,eutectic high-entropy alloys (EHEAs) have intrigued substantial research enthusiasms due to their good castability as well as balanced strength-ductility synergy.In this study,a bulk cast Al19.25Co18.86Fe18.36Ni43.53 EHEA is developed with fine in-situ lamellar eutectics.The eutectics comprise alternating ordered face-centered-cubic (L12) and ordered body-centered-cubic (B2) phases with semi-coherent interfaces.The resulting microstructure resembles that of most reported as-cast EHEAs,but the B2 lamellae are devoid of nano-precipitates because of the Cr-element removal in current tailored eutectic composition.Surprisingly,the B2 lamellae still feature much higher deformation resistance than the L12 lamellae,so that less lattice defects are detected in the B2 lamellae until the fracture.More interestingly,in the L12 lamellae we identify a dynamic microstructure refinement that correlates to extraordinary strain hardening in tension.The precipitate-free EHEA consequently shows excellent tensile ductility of～10 ％ and high ultimate strength up to ～956 MPa.

Key words

High-entropy alloy/Lamellar eutectic/Deformation resistance/Microstructure refinement/Strain hardening

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基金项目

National Key Research and Development Program of China(2018YFF0109404)

National Key Research and Development Program of China(2016YFB0300401)

National Key Research and Development Program of China(2016YFB0301401)

National Natural Science Foundation of China(U1732276)

National Natural Science Foundation of China(U1860202)

National Natural Science Foundation of China(51704193)

National Natural Science Foundation of China(52004156)

National Natural Science Foundation of China(51904184)

National Science Foundation(DMR-1611180)

US Army Research Office(W911NF-19-2-0049)

出版年

2021
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38
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