Time-Temperature Dependent Short- and Long-Range Structural Transformation in Medium-Entropy Alloys

Yoshihiko Umemoto; Yoichi Ikeda; Masaki Fujita

doi:10.2320/matertrans.MT-M2023071

Time-Temperature Dependent Short- and Long-Range Structural Transformation in Medium-Entropy Alloys

Yoshihiko Umemoto
, Yoichi Ikeda
, Masaki Fujita

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

5 Scopus citations

Abstract

Neutron scattering experiments were conducted to reveal the origin of diffuse scattering in a medium-entropy alloy (MnCoNi). Results showed that a time-temperature-dependent short- and long-range structural transformation from a face-centered cubic to a primitive tetragonal structure occurs. In the MnCoNi alloy, the long-range ordered phase with a relatively small c/a ratio of 3.7(1)% can only be grown in a limited temperature range, whereas short-range structural transformation with a short correlation length of 14 nm can be formed in a wide temperature range. On the contrary, no sign of short-/long-range staggered atomic rearrangement, such as L1₀ and L1₂ structures, was observed in the CrCoNi alloy at least at room temperature. The difference in the forming ability of short-/long-range ordering between the MnCoNi and CrCoNi alloys was discussed.

Original language	English
Pages (from-to)	2018-2021
Number of pages	4
Journal	Materials Transactions
Volume	64
Issue number	8
DOIs	https://doi.org/10.2320/matertrans.MT-M2023071
State	Published - 2023
Externally published	Yes

Funding

One of the authors (YI) thanks Dr. M. Enoki and Prof. H. Ohtani for their helpful advice. We also thank Mr. M. Ohkawara for his kind support on the neutron experiments at JRR-3. This work was supported by Grants-in-Aid for Scientific Research on Innovative Areas on High Entropy Alloys (JP19H05164 and JP21H00139). We wish to thank the Analytical Research Core for Advanced Materials at the Institute for Materials Research, Tohoku University for the experimental support for chemical composition analysis with the XRF spectrometer. The neutron scattering experiments were performed under the Joint-Use Research Program for Neutron Scattering, Institute for Solid State Physics (ISSP), University of Tokyo, at the Japan Research Reactor JRR-3 (6G IRT program 21402 and 22402). We gratefully acknowledge the support from E-IMR and the Center of Neutron Science for Advanced Materials, Institute for Materials Research, Tohoku University.

Keywords

medium-entropy alloy
neutron scattering
short-range order
structural relaxation

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10.2320/matertrans.MT-M2023071

Cite this

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title = "Time-Temperature Dependent Short- and Long-Range Structural Transformation in Medium-Entropy Alloys",

abstract = "Neutron scattering experiments were conducted to reveal the origin of diffuse scattering in a medium-entropy alloy (MnCoNi). Results showed that a time-temperature-dependent short- and long-range structural transformation from a face-centered cubic to a primitive tetragonal structure occurs. In the MnCoNi alloy, the long-range ordered phase with a relatively small c/a ratio of 3.7(1)\% can only be grown in a limited temperature range, whereas short-range structural transformation with a short correlation length of 14 nm can be formed in a wide temperature range. On the contrary, no sign of short-/long-range staggered atomic rearrangement, such as L10 and L12 structures, was observed in the CrCoNi alloy at least at room temperature. The difference in the forming ability of short-/long-range ordering between the MnCoNi and CrCoNi alloys was discussed.",

keywords = "medium-entropy alloy, neutron scattering, short-range order, structural relaxation",

author = "Yoshihiko Umemoto and Yoichi Ikeda and Masaki Fujita",

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year = "2023",

doi = "10.2320/matertrans.MT-M2023071",

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TY - JOUR

T1 - Time-Temperature Dependent Short- and Long-Range Structural Transformation in Medium-Entropy Alloys

AU - Umemoto, Yoshihiko

AU - Ikeda, Yoichi

AU - Fujita, Masaki

PY - 2023

Y1 - 2023

N2 - Neutron scattering experiments were conducted to reveal the origin of diffuse scattering in a medium-entropy alloy (MnCoNi). Results showed that a time-temperature-dependent short- and long-range structural transformation from a face-centered cubic to a primitive tetragonal structure occurs. In the MnCoNi alloy, the long-range ordered phase with a relatively small c/a ratio of 3.7(1)% can only be grown in a limited temperature range, whereas short-range structural transformation with a short correlation length of 14 nm can be formed in a wide temperature range. On the contrary, no sign of short-/long-range staggered atomic rearrangement, such as L10 and L12 structures, was observed in the CrCoNi alloy at least at room temperature. The difference in the forming ability of short-/long-range ordering between the MnCoNi and CrCoNi alloys was discussed.

AB - Neutron scattering experiments were conducted to reveal the origin of diffuse scattering in a medium-entropy alloy (MnCoNi). Results showed that a time-temperature-dependent short- and long-range structural transformation from a face-centered cubic to a primitive tetragonal structure occurs. In the MnCoNi alloy, the long-range ordered phase with a relatively small c/a ratio of 3.7(1)% can only be grown in a limited temperature range, whereas short-range structural transformation with a short correlation length of 14 nm can be formed in a wide temperature range. On the contrary, no sign of short-/long-range staggered atomic rearrangement, such as L10 and L12 structures, was observed in the CrCoNi alloy at least at room temperature. The difference in the forming ability of short-/long-range ordering between the MnCoNi and CrCoNi alloys was discussed.

KW - medium-entropy alloy

KW - neutron scattering

KW - short-range order

KW - structural relaxation

UR - https://www.scopus.com/pages/publications/85169015399

U2 - 10.2320/matertrans.MT-M2023071

DO - 10.2320/matertrans.MT-M2023071

M3 - Article

AN - SCOPUS:85169015399

SN - 1345-9678

VL - 64

SP - 2018

EP - 2021

JO - Materials Transactions

JF - Materials Transactions

IS - 8

ER -

Time-Temperature Dependent Short- and Long-Range Structural Transformation in Medium-Entropy Alloys

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Keywords

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