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Applied Physics A

, 125:699 | Cite as

Microstructural evolution, phase formation and mechanical properties of multi-component AlCoCrFeNix alloys

  • Leigang Cao
  • Xiaohe Wang
  • Yiming Wang
  • Leilei Zhang
  • Yue Yang
  • Fengbin Liu
  • Yan CuiEmail author
Article
  • 1 Downloads

Abstract

Microstructure evolution and mechanical property of the AlCoCrFeNix (1.0 ≤ x ≤ 3.0) high-entropy alloys were investigated in this paper. Nickel element facilitates the formation of the FCC phase from the BCC matrix. Correspondingly, the microstructure changes from dendrite morphology (1.0 ≤ x ≤ 1.5) to eutectic structure (x = 2.1) and finally to oriented cellular structure (x ≥ 2.4). The onset of the structure transition was observed in the AlCoCrFeNi1.5 alloy with the formation of the ordered B2 single-phase dendrite, resulting in the observed high strength and hardness in comparison to the AlCoCrFeNi alloy. The compressive yield strength and hardness present a general decreasing trend, dropping from 1360 MPa (x = 1.5) to 450 MPa (x = 3.0) and from 524 HV (x = 1.5) to 241 HV (x = 3.0), respectively. The equiaxed grain with dendritic morphology in the AlCoCrFeNi and AlCoCrFeNi1.5 alloys could be attributed to multiple-nucleation and subsequent growth during the solidification process. The thermodynamic properties of the AlCoCrFeNix (1.0 ≤ x ≤ 1.8) were also studied by DTA measurement, indicating the decreasing fraction of the metastable phase in the as-cast alloys as the Ni content is increased.

Notes

Acknowledgements

This work is financially supported by National Key R&D Program of China (No. 2017YFB0703102), Yuqing Talent support program (18XN012-081) and Research Start-Up Funding of North China University of Technology.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Materials Science and EngineeringNorth China University of TechnologyBeijingChina

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