A novel NbTaW0.5 (Mo2C)x refractory high-entropy alloy with excellent mechanical properties

•A novel dual-phase NbTaW0.5(Mo2C)x refractory high entropy alloys were designed and prepared.•The NbTaW0.5(Mo2C)x alloys displayed excellent mechanical properties, far exceeding the currently reported RHEAs.•The interesting solidification microstructure and phase formation were discussed.•The high...

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Published inJournal of alloys and compounds Vol. 889; p. 161800
Main Authors Wu, Shiyu, Qiao, Dongxu, Zhao, Hongliang, Wang, Jun, Lu, Yiping
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 31.12.2021
Elsevier BV
Subjects
Alloys
Casting alloys
Crystal structure
Hexagonal close packed crystals
High entropy alloys
Isothermal annealing
Master alloys
Mechanical properties
Microstructure
Molybdenum carbide
Morphology
Phase composition
Refractory high-entropy alloys
Room temperature
Solid solutions
Supersaturation
Mechanical properties
Refractory high-entropy alloys
Microstructure
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Abstract •A novel dual-phase NbTaW0.5(Mo2C)x refractory high entropy alloys were designed and prepared.•The NbTaW0.5(Mo2C)x alloys displayed excellent mechanical properties, far exceeding the currently reported RHEAs.•The interesting solidification microstructure and phase formation were discussed.•The high temperature strength depends on the carbide. In this study, a refractory high-entropy alloy (RHEA) NbTaW0.5 was selected as the master alloy and carbide Mo2C was added to prepare the NbTaW0.5(Mo2C)x (x = 0–0.25) RHEAs. The effect of Mo2C addition on the phase composition, microstructure evolution, and mechanical properties of the as-cast and annealed RHEA was investigated. The microstructure and mechanical properties of the as-cast and isothermally annealed (1673 K/12 h) NbTaW0.5(Mo2C)x RHEAs were studied. The results showed that the as-cast RHEAs consisted of a disordered body-centered cubic solid solution phase and a second M2C carbide phase with hexagonal close-packed (HCP) crystal structure. The HCP–M2C carbides were enriched with Nb, Ta, and C elements and tended to achieve a similar eutectic morphology in the interdendritic regions. After isothermal annealing, orthorhombic carbides were formed near the primary carbides, which apparently depleted the carbon supersaturation of the matrix. The compression mechanical properties of as-cast alloys were determined at room temperature, 1473 K, and 1673 K. The yield strength of NbTaW0.5(Mo2C)0.2 RHEA exceeded 1000 MPa at 1473 K, and even reached 697 MPa at 1673 K, far exceeding some of the currently reported RHEAs. These RHEAs had good plasticity and showed excellent application prospects.
AbstractList •A novel dual-phase NbTaW0.5(Mo2C)x refractory high entropy alloys were designed and prepared.•The NbTaW0.5(Mo2C)x alloys displayed excellent mechanical properties, far exceeding the currently reported RHEAs.•The interesting solidification microstructure and phase formation were discussed.•The high temperature strength depends on the carbide. In this study, a refractory high-entropy alloy (RHEA) NbTaW0.5 was selected as the master alloy and carbide Mo2C was added to prepare the NbTaW0.5(Mo2C)x (x = 0–0.25) RHEAs. The effect of Mo2C addition on the phase composition, microstructure evolution, and mechanical properties of the as-cast and annealed RHEA was investigated. The microstructure and mechanical properties of the as-cast and isothermally annealed (1673 K/12 h) NbTaW0.5(Mo2C)x RHEAs were studied. The results showed that the as-cast RHEAs consisted of a disordered body-centered cubic solid solution phase and a second M2C carbide phase with hexagonal close-packed (HCP) crystal structure. The HCP–M2C carbides were enriched with Nb, Ta, and C elements and tended to achieve a similar eutectic morphology in the interdendritic regions. After isothermal annealing, orthorhombic carbides were formed near the primary carbides, which apparently depleted the carbon supersaturation of the matrix. The compression mechanical properties of as-cast alloys were determined at room temperature, 1473 K, and 1673 K. The yield strength of NbTaW0.5(Mo2C)0.2 RHEA exceeded 1000 MPa at 1473 K, and even reached 697 MPa at 1673 K, far exceeding some of the currently reported RHEAs. These RHEAs had good plasticity and showed excellent application prospects.
In this study, a refractory high-entropy alloy (RHEA) NbTaW0.5 was selected as the master alloy and carbide Mo2C was added to prepare the NbTaW0.5(Mo2C)x (x = 0–0.25) RHEAs. The effect of Mo2C addition on the phase composition, microstructure evolution, and mechanical properties of the as-cast and annealed RHEA was investigated. The microstructure and mechanical properties of the as-cast and isothermally annealed (1673 K/12 h) NbTaW0.5(Mo2C)x RHEAs were studied. The results showed that the as-cast RHEAs consisted of a disordered body-centered cubic solid solution phase and a second M2C carbide phase with hexagonal close-packed (HCP) crystal structure. The HCP–M2C carbides were enriched with Nb, Ta, and C elements and tended to achieve a similar eutectic morphology in the interdendritic regions. After isothermal annealing, orthorhombic carbides were formed near the primary carbides, which apparently depleted the carbon supersaturation of the matrix. The compression mechanical properties of as-cast alloys were determined at room temperature, 1473 K, and 1673 K. The yield strength of NbTaW0.5(Mo2C)0.2 RHEA exceeded 1000 MPa at 1473 K, and even reached 697 MPa at 1673 K, far exceeding some of the currently reported RHEAs. These RHEAs had good plasticity and showed excellent application prospects.
ArticleNumber 161800
Author Wu, Shiyu
Qiao, Dongxu
Wang, Jun
Lu, Yiping
Zhao, Hongliang
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  givenname: Dongxu
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  givenname: Hongliang
  surname: Zhao
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  organization: School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
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  fullname: Wang, Jun
  organization: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
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  givenname: Yiping
  surname: Lu
  fullname: Lu, Yiping
  email: luyiping@dlut.edu.cn
  organization: Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
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Snippet •A novel dual-phase NbTaW0.5(Mo2C)x refractory high entropy alloys were designed and prepared.•The NbTaW0.5(Mo2C)x alloys displayed excellent mechanical...
In this study, a refractory high-entropy alloy (RHEA) NbTaW0.5 was selected as the master alloy and carbide Mo2C was added to prepare the NbTaW0.5(Mo2C)x (x =...
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SubjectTerms Alloys
Casting alloys
Crystal structure
Hexagonal close packed crystals
High entropy alloys
Isothermal annealing
Master alloys
Mechanical properties
Microstructure
Molybdenum carbide
Morphology
Phase composition
Refractory high-entropy alloys
Room temperature
Solid solutions
Supersaturation
Title A novel NbTaW0.5 (Mo2C)x refractory high-entropy alloy with excellent mechanical properties
URI https://dx.doi.org/10.1016/j.jallcom.2021.161800
https://www.proquest.com/docview/2602708277
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