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

doi:10.1016/j.matdes.2020.108716

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

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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 language	English
Article number	108716
Number of pages	10
Journal	Materials and Design
Volume	192
DOIs	https://doi.org/10.1016/j.matdes.2020.108716
Publication status	Published - 2020

Keywords

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

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10.1016/j.matdes.2020.108716

1-s2.0-S0264127520302501-mainFinal published version, 2.7 MBLicence: CC BY

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

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.",

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doi = "10.1016/j.matdes.2020.108716",

language = "English",

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journal = "Materials and Design",

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T1 - Design of a dual-phase hcp-bcc high entropy alloy strengthened by ω nanoprecipitates in the Sc-Ti-Zr-Hf-Re system

AU - Rogal, Lukasz

AU - Ikeda, Yuji

AU - Lai, Minjie

AU - Körmann, Fritz

AU - Kalinowska, Alicja

AU - Grabowski, Blazej

PY - 2020

Y1 - 2020

N2 - 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.

AB - 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.

KW - ab initio simulations

KW - Dual-phase HEA

KW - High entropy alloys

KW - TEM studies

KW - ω phase

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DO - 10.1016/j.matdes.2020.108716

M3 - Article

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SN - 0264-1275

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JO - Materials and Design

JF - Materials and Design

M1 - 108716

ER -

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

Abstract

Keywords

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