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Designing High Entropy Alloys with Dual fcc and bcc Solid-Solution Phases: Structures and Mechanical Properties

  • Zhaowu Tang
  • Shang Zhang
  • Ruipeng Cai
  • Qing Zhou
  • Haifeng WangEmail author
Article

Abstract

High entropy alloys (HEAs) with a single fcc phase are usually ductile but not strong, while HEAs with a single bcc phase have high strength but low ductility. Therefore, the combination of fcc and bcc phases was adopted to optimize the mechanical properties. Based on a latest data collection of reported HEAs with a single fcc phase, with dual fcc and bcc phases, and with a single bcc phase, the current work shows that the average valence electron concentration (VEC) and its standard deviation (δVEC) can describe quantitatively phase selection between the fcc and bcc phases in HEAs. Highest (lowest) hardness, highest (lowest) strength, and lowest (highest) ductility were found at the same critical value of VEC* ≈ 6.13 (δVEC* ≈ 0.207), which corresponds to the HEA with a single bcc (fcc) phase. The current work provides some quantitative rules for designing HEAs with dual fcc and bcc phases as well as modulating strength and ductility.

Notes

Acknowledgments

This work was done under the Huo Yingdong Young Teacher Fund (Grant No. 151048), the Science Fund for Distinguished Young Scholars from Shaanxi province (Grant No. 2018-JC007), and the Fundamental Research Funds for the Central Universities. The authors appreciate Dr. Vipul Bhardwaj for reading and polishing the manuscript.

Supplementary material

11661_2019_5131_MOESM1_ESM.docx (87 kb)
Supplementary material 1 (DOCX 87 kb)

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2019

Authors and Affiliations

  • Zhaowu Tang
    • 1
  • Shang Zhang
    • 1
  • Ruipeng Cai
    • 1
  • Qing Zhou
    • 1
  • Haifeng Wang
    • 1
    Email author
  1. 1.State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’anP.R. China

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