Design of a dual-phase hcp-bcc high entropy alloy strengthened by ω nanoprecipitates in the Sc-Ti-Zr-Hf-Re system

Lukasz Rogal, Yuji Ikeda, Minjie Lai, Fritz Körmann, Alicja Kalinowska, Blazej Grabowski

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)
19 Downloads (Pure)

Abstract

High entropy alloys (HEAs) in the hexagonal close-packed (hcp) phase usually show poor mechanical properties. We demonstrate here, by use of ab initio simulations and detailed experimental investigations, that the mechanical properties can be improved by optimizing the microstructure. In particular we design a dual-phase HEA consisting of a body-centered cubic (bcc) matrix and hcp laths, with nanoprecipitates of the ω phase in the Sc-Ti-Zr-Hf-Re system, by controlling the Re content. This dedicated microstructure reveals, already in the as-cast state, high compressive strength and good ductility of 1910 MPa and 8%, respectively. Our study lifts the hcp-based HEAs onto a competitive, technological level.

Original languageEnglish
Article number108716
Number of pages10
JournalMaterials and Design
Volume192
DOIs
Publication statusPublished - 2020

Keywords

  • ab initio simulations
  • Dual-phase HEA
  • High entropy alloys
  • TEM studies
  • ω phase

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