Development and characterization of a low-density TiNbZrAlTa refractory high entropy alloy with enhanced compressive strength and plasticity

Muhammad Abubaker Khan; Muhammad Hamza; Jamieson Brechtl; Zahid Nazir; Naeem Akhtar Qaisrani; Ghulam Yasin; Tahir Ahmad; Wei Bing Liao; Peter K. Liaw; Mohamed A. Afifi

doi:10.1016/j.matchar.2023.113301

Development and characterization of a low-density TiNbZrAlTa refractory high entropy alloy with enhanced compressive strength and plasticity

Muhammad Abubaker Khan, Muhammad Hamza, Jamieson Brechtl, Zahid Nazir, Naeem Akhtar Qaisrani, Ghulam Yasin, Tahir Ahmad, Wei Bing Liao, Peter K. Liaw, Mohamed A. Afifi

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Abstract

A new refractory high entropy alloy (RHEA) is designed by combining refractory elements Nb and Ta with Ti, Zr, and Al, resulting in a (TiNbZr)₈₉(AlTa)₁₁ alloy composition with a low-density of 6.0 g/cm³. The novel RHEA features a BCC matrix with B2 and Zr₅Al₃ nano precipitates, exhibiting a compressive yield strength of ∼890 MPa and specific yield strength of ∼148.3 MPa g⁻¹ cm³. Remarkably, the alloy demonstrates excellent compressive plasticity of ∼70% at 298 K. As the temperature increases to 873 K, 1073 K, and 1273 K, the yield strength of the RHEA gradually decreases to ∼610 MPa, ∼ 210 MPa, and ∼ 60 MPa, respectively. These results indicate that this novel RHEA showcases a combination of good specific strength and plasticity. Post-compression, B2, and Zr₅Al₃ phases are observed. The second-phase particles dispersed throughout the grains hinder dislocation motion and contribute to the formation of sub-grain boundaries during hot compression.

Original language	English
Article number	113301
Journal	Materials Characterization
Volume	205
DOIs	https://doi.org/10.1016/j.matchar.2023.113301
State	Published - Nov 2023

Funding

This research was supported by the Guangdong Basic and Applied Basic Research Foundation (Grant Nos. 2021A1515012278 and 2022A1515010288), Shenzhen Natural Science Foundation (Grant No. JCYJ20190808150409413). Muhammad Abubaker Khan & Wei-Bing Liao would like to acknowledge the technical support from the Instrumental Analysis Center of Shenzhen University, Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, and Beijing Institute of Technology, Beijing, China. This research was supported by the Guangdong Basic and Applied Basic Research Foundation (Grant Nos. 2021A1515012278 and 2022A1515010288 ), Shenzhen Natural Science Foundation (Grant No. JCYJ20190808150409413 ). Muhammad Abubaker Khan & Wei-Bing Liao would like to acknowledge the technical support from the Instrumental Analysis Center of Shenzhen University , Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing , and Beijing Institute of Technology , Beijing, China.

Funders	Funder number
Beijing Advanced Innovation Center for Materials Genome Engineering
Beijing Institute of Technology , Beijing, China
Beijing Institute of Technology, Beijing, China
School of Materials Science and Engineering, University of Science and Technology Beijing
Natural Science Foundation of Shenzhen Municipality	JCYJ20190808150409413
Shenzhen University
Basic and Applied Basic Research Foundation of Guangdong Province	2022A1515010288, 2021A1515012278

Keywords

B2
Compressive plasticity
Compressive strength
Refractory high entropy alloy (RHEA)
ZrAl nano precipitates

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10.1016/j.matchar.2023.113301

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Khan, M. A., Hamza, M., Brechtl, J., Nazir, Z., Qaisrani, N. A., Yasin, G., Ahmad, T., Liao, W. B., Liaw, P. K., & Afifi, M. A. (2023). Development and characterization of a low-density TiNbZrAlTa refractory high entropy alloy with enhanced compressive strength and plasticity. Materials Characterization, 205, Article 113301. https://doi.org/10.1016/j.matchar.2023.113301

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abstract = "A new refractory high entropy alloy (RHEA) is designed by combining refractory elements Nb and Ta with Ti, Zr, and Al, resulting in a (TiNbZr)89(AlTa)11 alloy composition with a low-density of 6.0 g/cm3. The novel RHEA features a BCC matrix with B2 and Zr5Al3 nano precipitates, exhibiting a compressive yield strength of ∼890 MPa and specific yield strength of ∼148.3 MPa g−1 cm3. Remarkably, the alloy demonstrates excellent compressive plasticity of ∼70% at 298 K. As the temperature increases to 873 K, 1073 K, and 1273 K, the yield strength of the RHEA gradually decreases to ∼610 MPa, ∼ 210 MPa, and ∼ 60 MPa, respectively. These results indicate that this novel RHEA showcases a combination of good specific strength and plasticity. Post-compression, B2, and Zr5Al3 phases are observed. The second-phase particles dispersed throughout the grains hinder dislocation motion and contribute to the formation of sub-grain boundaries during hot compression.",

keywords = "B2, Compressive plasticity, Compressive strength, Refractory high entropy alloy (RHEA), ZrAl nano precipitates",

author = "Khan, {Muhammad Abubaker} and Muhammad Hamza and Jamieson Brechtl and Zahid Nazir and Qaisrani, {Naeem Akhtar} and Ghulam Yasin and Tahir Ahmad and Liao, {Wei Bing} and Liaw, {Peter K.} and Afifi, {Mohamed A.}",

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doi = "10.1016/j.matchar.2023.113301",

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T1 - Development and characterization of a low-density TiNbZrAlTa refractory high entropy alloy with enhanced compressive strength and plasticity

AU - Khan, Muhammad Abubaker

AU - Hamza, Muhammad

AU - Brechtl, Jamieson

AU - Nazir, Zahid

AU - Qaisrani, Naeem Akhtar

AU - Yasin, Ghulam

AU - Ahmad, Tahir

AU - Liao, Wei Bing

AU - Liaw, Peter K.

AU - Afifi, Mohamed A.

PY - 2023/11

Y1 - 2023/11

N2 - A new refractory high entropy alloy (RHEA) is designed by combining refractory elements Nb and Ta with Ti, Zr, and Al, resulting in a (TiNbZr)89(AlTa)11 alloy composition with a low-density of 6.0 g/cm3. The novel RHEA features a BCC matrix with B2 and Zr5Al3 nano precipitates, exhibiting a compressive yield strength of ∼890 MPa and specific yield strength of ∼148.3 MPa g−1 cm3. Remarkably, the alloy demonstrates excellent compressive plasticity of ∼70% at 298 K. As the temperature increases to 873 K, 1073 K, and 1273 K, the yield strength of the RHEA gradually decreases to ∼610 MPa, ∼ 210 MPa, and ∼ 60 MPa, respectively. These results indicate that this novel RHEA showcases a combination of good specific strength and plasticity. Post-compression, B2, and Zr5Al3 phases are observed. The second-phase particles dispersed throughout the grains hinder dislocation motion and contribute to the formation of sub-grain boundaries during hot compression.

AB - A new refractory high entropy alloy (RHEA) is designed by combining refractory elements Nb and Ta with Ti, Zr, and Al, resulting in a (TiNbZr)89(AlTa)11 alloy composition with a low-density of 6.0 g/cm3. The novel RHEA features a BCC matrix with B2 and Zr5Al3 nano precipitates, exhibiting a compressive yield strength of ∼890 MPa and specific yield strength of ∼148.3 MPa g−1 cm3. Remarkably, the alloy demonstrates excellent compressive plasticity of ∼70% at 298 K. As the temperature increases to 873 K, 1073 K, and 1273 K, the yield strength of the RHEA gradually decreases to ∼610 MPa, ∼ 210 MPa, and ∼ 60 MPa, respectively. These results indicate that this novel RHEA showcases a combination of good specific strength and plasticity. Post-compression, B2, and Zr5Al3 phases are observed. The second-phase particles dispersed throughout the grains hinder dislocation motion and contribute to the formation of sub-grain boundaries during hot compression.

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KW - Compressive plasticity

KW - Compressive strength

KW - Refractory high entropy alloy (RHEA)

KW - ZrAl nano precipitates

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Development and characterization of a low-density TiNbZrAlTa refractory high entropy alloy with enhanced compressive strength and plasticity

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