Structural stability and thermal expansion of TiTaNbMoZr refractory high entropy alloy

Madhusmita Behera; Ajit Panigrahi; Matthias Bönisch; Gyan Shankar; Pratima Kumari Mishra

doi:10.1016/j.jallcom.2021.162154

Structural stability and thermal expansion of TiTaNbMoZr refractory high entropy alloy

Madhusmita Behera
, Ajit Panigrahi
, Matthias Bönisch
, Gyan Shankar
, Pratima Kumari Mishra

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

28 Scopus citations

Abstract

A near-equiatomic TiTaNbMoZr refractory high entropy alloy (RHEA) was prepared by vacuum arc melting. It consists of two BCC solid solution phases (predominant and minor phase are named as B-major and B-minor, respectively) at room temperature. Structural stability and thermal expansion were investigated using in-situ synchrotron XRD and dilatometry. B-major phase is observed until 1273 K, whereas B-minor phase is present up to 1173 K. Above 1173 K, the formation of B′ phase is observed. The mean lattice coefficient of thermal expansion (α_l^m) and the mean dilatometric coefficient of thermal expansion (α_dil^m) are derived in the range of 323–1173 K and 323–1273 K, respectively. α_l^m increases linearly in the range of (8.1–8.8)× 10⁻⁶ K⁻¹ and the mean α_dil^m varies from 7.5 × 10⁻⁶ K⁻¹ to 10.9 × 10⁻⁶ K⁻¹. Dilatometric strain and lattice strain are found to be identical up to 1000 K. However, beyond 1000 K, the dilatometric strain increases considerably in comparison to the lattice strain due to the generation of temperature-induced point defects (vacancies). The present work demonstrates that the TiTaNbMoZr RHEA exhibits structural (phase) stability up to 1173 K and thermal stability up to 1000 K.

Original language	English
Article number	162154
Journal	Journal of Alloys and Compounds
Volume	892
DOIs	https://doi.org/10.1016/j.jallcom.2021.162154
State	Published - Feb 5 2022
Externally published	Yes

Funding

This work is funded by the Department of Science and Technology under the WOS-A scheme with File No. SR/WOS-A/ET-127/2017 . We thank the Director of, CSIR-IMMT Bhubaneswar, Odisha for carrying out this project. We acknowledge the CCD department, CSIR-IMMT Bhubaneswar for XRD and SEM characterization. We acknowledge Dr. Prafull Pandey for TEM characterization. We acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for provision of experimental facilities. Parts of this research were carried out at PETRA III, and we would like to thank Dr. Andreas Stark, Dr. Emad Maawad, and Dr. Norbert Schell for assistance in using beamline P07 within the proposal I-20190769. The research leading to this result has been supported by the project CALIPSO plus under the Grant Agreement 730872 from the EU Framework Programme for Research and Innovation HORIZON 2020 . This work is funded by the Department of Science and Technology under the WOS-A scheme with File No. SR/WOS-A/ET-127/2017. We thank the Director of, CSIR-IMMT Bhubaneswar, Odisha for carrying out this project. We acknowledge the CCD department, CSIR-IMMT Bhubaneswar for XRD and SEM characterization. We acknowledge Dr. Prafull Pandey for TEM characterization. We acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for provision of experimental facilities. Parts of this research were carried out at PETRA III, and we would like to thank Dr. Andreas Stark, Dr. Emad Maawad, and Dr. Norbert Schell for assistance in using beamline P07 within the proposal I-20190769. The research leading to this result has been supported by the project CALIPSO plus under the Grant Agreement 730872 from the EU Framework Programme for Research and Innovation HORIZON 2020.

Keywords

Coefficient of thermal expansion
Dilatometric strain
Dilatometry
High entropy alloy
In-situ synchrotron XRD
Point defects

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10.1016/j.jallcom.2021.162154

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title = "Structural stability and thermal expansion of TiTaNbMoZr refractory high entropy alloy",

abstract = "A near-equiatomic TiTaNbMoZr refractory high entropy alloy (RHEA) was prepared by vacuum arc melting. It consists of two BCC solid solution phases (predominant and minor phase are named as B-major and B-minor, respectively) at room temperature. Structural stability and thermal expansion were investigated using in-situ synchrotron XRD and dilatometry. B-major phase is observed until 1273 K, whereas B-minor phase is present up to 1173 K. Above 1173 K, the formation of B′ phase is observed. The mean lattice coefficient of thermal expansion (αlm) and the mean dilatometric coefficient of thermal expansion (αdilm) are derived in the range of 323–1173 K and 323–1273 K, respectively. αlm increases linearly in the range of (8.1–8.8)× 10−6 K−1 and the mean αdilm varies from 7.5 × 10−6 K−1 to 10.9 × 10−6 K−1. Dilatometric strain and lattice strain are found to be identical up to 1000 K. However, beyond 1000 K, the dilatometric strain increases considerably in comparison to the lattice strain due to the generation of temperature-induced point defects (vacancies). The present work demonstrates that the TiTaNbMoZr RHEA exhibits structural (phase) stability up to 1173 K and thermal stability up to 1000 K.",

keywords = "Coefficient of thermal expansion, Dilatometric strain, Dilatometry, High entropy alloy, In-situ synchrotron XRD, Point defects",

author = "Madhusmita Behera and Ajit Panigrahi and Matthias B{\"o}nisch and Gyan Shankar and Mishra, \{Pratima Kumari\}",

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AU - Behera, Madhusmita

AU - Panigrahi, Ajit

AU - Bönisch, Matthias

AU - Shankar, Gyan

AU - Mishra, Pratima Kumari

PY - 2022/2/5

Y1 - 2022/2/5

N2 - A near-equiatomic TiTaNbMoZr refractory high entropy alloy (RHEA) was prepared by vacuum arc melting. It consists of two BCC solid solution phases (predominant and minor phase are named as B-major and B-minor, respectively) at room temperature. Structural stability and thermal expansion were investigated using in-situ synchrotron XRD and dilatometry. B-major phase is observed until 1273 K, whereas B-minor phase is present up to 1173 K. Above 1173 K, the formation of B′ phase is observed. The mean lattice coefficient of thermal expansion (αlm) and the mean dilatometric coefficient of thermal expansion (αdilm) are derived in the range of 323–1173 K and 323–1273 K, respectively. αlm increases linearly in the range of (8.1–8.8)× 10−6 K−1 and the mean αdilm varies from 7.5 × 10−6 K−1 to 10.9 × 10−6 K−1. Dilatometric strain and lattice strain are found to be identical up to 1000 K. However, beyond 1000 K, the dilatometric strain increases considerably in comparison to the lattice strain due to the generation of temperature-induced point defects (vacancies). The present work demonstrates that the TiTaNbMoZr RHEA exhibits structural (phase) stability up to 1173 K and thermal stability up to 1000 K.

AB - A near-equiatomic TiTaNbMoZr refractory high entropy alloy (RHEA) was prepared by vacuum arc melting. It consists of two BCC solid solution phases (predominant and minor phase are named as B-major and B-minor, respectively) at room temperature. Structural stability and thermal expansion were investigated using in-situ synchrotron XRD and dilatometry. B-major phase is observed until 1273 K, whereas B-minor phase is present up to 1173 K. Above 1173 K, the formation of B′ phase is observed. The mean lattice coefficient of thermal expansion (αlm) and the mean dilatometric coefficient of thermal expansion (αdilm) are derived in the range of 323–1173 K and 323–1273 K, respectively. αlm increases linearly in the range of (8.1–8.8)× 10−6 K−1 and the mean αdilm varies from 7.5 × 10−6 K−1 to 10.9 × 10−6 K−1. Dilatometric strain and lattice strain are found to be identical up to 1000 K. However, beyond 1000 K, the dilatometric strain increases considerably in comparison to the lattice strain due to the generation of temperature-induced point defects (vacancies). The present work demonstrates that the TiTaNbMoZr RHEA exhibits structural (phase) stability up to 1173 K and thermal stability up to 1000 K.

KW - Coefficient of thermal expansion

KW - Dilatometric strain

KW - Dilatometry

KW - High entropy alloy

KW - In-situ synchrotron XRD

KW - Point defects

UR - https://www.scopus.com/pages/publications/85115988429

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DO - 10.1016/j.jallcom.2021.162154

M3 - Article

AN - SCOPUS:85115988429

SN - 0925-8388

VL - 892

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

M1 - 162154

ER -

Structural stability and thermal expansion of TiTaNbMoZr refractory high entropy alloy

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