Cr-Mo-V-W: A new refractory and transition metal high-entropy alloy system

D. Ikeuchi; D. J.M. King; K. J. Laws; A. J. Knowles; R. D. Aughterson; G. R. Lumpkin; E. G. Obbard

doi:10.1016/j.scriptamat.2018.08.045

Cr-Mo-V-W: A new refractory and transition metal high-entropy alloy system

D. Ikeuchi, D. J.M. King, K. J. Laws, A. J. Knowles, R. D. Aughterson, G. R. Lumpkin, E. G. Obbard^*

^*Corresponding author for this work

Metallurgy and Materials

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

10 Citations (Scopus)

Abstract

Cr-Mo-V-W high-entropy alloy (HEA) is studied, with 2553 K equilibrium solidus and high Cr content to promote protective oxide scale formation, suggesting potential applications in hot, oxidising environments. Alloy Search and Predict (ASAP) and phase diagram calculations found a single phase, body-centred cubic (BCC) solid solution at elevated temperatures, across the range of compositions present within the system - uncommon for a HEA of refractory and transition metals. Density functional theory identified solubility of 22 at.% Cr at solidus temperature, with composition-dependent drive for segregation during cooling. An as-cast, BCC single-phase with the composition 31.3Cr-23.6Mo-26.4 V-18.7 W exhibiting dendritic microsegregation was verified.

Original language	English
Pages (from-to)	141-145
Number of pages	5
Journal	Scripta Materialia
Volume	158
Early online date	9 Sept 2018
DOIs	https://doi.org/10.1016/j.scriptamat.2018.08.045
Publication status	Published - 1 Jan 2019

Keywords

Alloy Search and Predict (ASAP)
CALPHAD
Density functional theory (DFT)
Microstructure
Refractory metals

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2018.08.045

https://spiral.imperial.ac.uk/handle/10044/1/63898

Cite this

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title = "Cr-Mo-V-W: A new refractory and transition metal high-entropy alloy system",

abstract = "Cr-Mo-V-W high-entropy alloy (HEA) is studied, with 2553 K equilibrium solidus and high Cr content to promote protective oxide scale formation, suggesting potential applications in hot, oxidising environments. Alloy Search and Predict (ASAP) and phase diagram calculations found a single phase, body-centred cubic (BCC) solid solution at elevated temperatures, across the range of compositions present within the system - uncommon for a HEA of refractory and transition metals. Density functional theory identified solubility of 22 at.% Cr at solidus temperature, with composition-dependent drive for segregation during cooling. An as-cast, BCC single-phase with the composition 31.3Cr-23.6Mo-26.4 V-18.7 W exhibiting dendritic microsegregation was verified.",

keywords = "Alloy Search and Predict (ASAP), CALPHAD, Density functional theory (DFT), Microstructure, Refractory metals",

author = "D. Ikeuchi and King, {D. J.M.} and Laws, {K. J.} and Knowles, {A. J.} and Aughterson, {R. D.} and Lumpkin, {G. R.} and Obbard, {E. G.}",

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doi = "10.1016/j.scriptamat.2018.08.045",

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journal = "Scripta Materialia",

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T2 - A new refractory and transition metal high-entropy alloy system

AU - Ikeuchi, D.

AU - King, D. J.M.

AU - Laws, K. J.

AU - Knowles, A. J.

AU - Aughterson, R. D.

AU - Lumpkin, G. R.

AU - Obbard, E. G.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Cr-Mo-V-W high-entropy alloy (HEA) is studied, with 2553 K equilibrium solidus and high Cr content to promote protective oxide scale formation, suggesting potential applications in hot, oxidising environments. Alloy Search and Predict (ASAP) and phase diagram calculations found a single phase, body-centred cubic (BCC) solid solution at elevated temperatures, across the range of compositions present within the system - uncommon for a HEA of refractory and transition metals. Density functional theory identified solubility of 22 at.% Cr at solidus temperature, with composition-dependent drive for segregation during cooling. An as-cast, BCC single-phase with the composition 31.3Cr-23.6Mo-26.4 V-18.7 W exhibiting dendritic microsegregation was verified.

AB - Cr-Mo-V-W high-entropy alloy (HEA) is studied, with 2553 K equilibrium solidus and high Cr content to promote protective oxide scale formation, suggesting potential applications in hot, oxidising environments. Alloy Search and Predict (ASAP) and phase diagram calculations found a single phase, body-centred cubic (BCC) solid solution at elevated temperatures, across the range of compositions present within the system - uncommon for a HEA of refractory and transition metals. Density functional theory identified solubility of 22 at.% Cr at solidus temperature, with composition-dependent drive for segregation during cooling. An as-cast, BCC single-phase with the composition 31.3Cr-23.6Mo-26.4 V-18.7 W exhibiting dendritic microsegregation was verified.

KW - Alloy Search and Predict (ASAP)

KW - CALPHAD

KW - Density functional theory (DFT)

KW - Microstructure

KW - Refractory metals

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SN - 1359-6462

VL - 158

SP - 141

EP - 145

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Cr-Mo-V-W: A new refractory and transition metal high-entropy alloy system

Abstract

Keywords

ASJC Scopus subject areas

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