Elemental partitioning as a route to design precipitation-hardened high entropy alloys

Feng He, Bin Han, Zhongsheng Yang, Da Chen, Guma Yeli, Yang Tong, Daixiu Wei, Junjie Li, Zhijun Wang, Jincheng Wang, Ji jung Kai

Research output: Contribution to journalArticlepeer-review

Abstract

Precipitation-hardened high entropy alloys (HEAs) with carefully tuned compositions have shown excellent mechanical properties, demonstrating great potential for engineering applications. However, due to the lack of precise multiple phase diagrams, the composition design of multi-principal-component HEAs still inevitably relies on the extremely time-consuming trial-and-error approach. The present study, on the basis of powerful composition quantification ability of atom probe tomography (APT) technology, proposed a framework to guide the quantitative design of precipitation-hardened HEAs. In this framework, the elemental partitioning was used as a crucial route to avoid the thermodynamic challenge of designing precipitation-hardened HEAs. As a case study, the role of Ti/Al ratio in the design of γ-γ′ HEAs was predicted through the proposed framework and then validated by experimental studies. The framework predicted that when the total content of Ti and Al is fixed, a higher Ti/Al ratio makes γ-γ′ HEA stronger. APT and mechanical results agreed well with these predictions and validated the feasibility of the framework. These findings provided a new route to design the precipitation-hardened alloys and a deeper insight into the design of γ-γ′ HEA.

Original languageEnglish
Pages (from-to)52-60
Number of pages9
JournalJournal of Materials Science and Technology
Volume72
DOIs
Publication statusPublished - 2021 May 10

Keywords

  • Alloy design
  • Atom probe tomography
  • Elemental partitioning
  • High entropy alloys

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Polymers and Plastics
  • Metals and Alloys
  • Materials Chemistry

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