Evolution of microstructure and hardness in Hf25Nb25Ti25Zr25 high-entropy alloy during high-pressure torsion

Gubicza, Jenő; Heczel, Anita; Kawasaki, Megumi; Han, Jae-Kyung; Zhao, Yakai; Xue, Yunfei; Huang, Shuo; Lábár, János L.

doi:10.1016/j.jallcom.2019.02.220

Cited by 41 publications

(27 citation statements)

References 49 publications

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“…The hardness of the Zr-depleted phase increases to ∼ 540 HV at the periphery of the disk after four revolutions, while that of the Zr-rich phase decreases to ∼ 480 HV. Similar results on the saturation hardness in single-phase BCC HEAs were reported in [23,24,35].…”

Section: Discussionsupporting

confidence: 86%

“…The goal of this work is to investigate the strain-hardening properties of a dual-phase refractory HEA and the mixing behavior of the two phases during HPT. Although several recent studies have been reported on HPT-processed single-phase FCC HEAs [19][20][21][22] as well as single-phase BCC refractory HEAs [23,24], the strain-hardening behavior of dual-phase refractory HEAs processed by HPT has only been studied recently [25,26].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Strain-hardening properties of the high-entropy alloy MoNbTaTiVZr processed by high-pressure torsion

Duan

Reiberg

Kutleša

et al. 2021

Continuum Mech. Thermodyn.

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An equiatomic MoNbTaTiVZr refractory high-entropy alloy (HEA) produced by arc melting was processed by high-pressure torsion (HPT) at room temperature. Thermodynamic calculations and experimental results indicated a dual-phase microstructure composed of about 85% BCC Zr-depleted and 15% BCC Zr-rich phase in the as-cast condition. HPT causes grain refinement and an increase in dislocation density without the formation of new phases. After four revolutions, the Zr-depleted phase was hardened to $$\sim $$ ∼ 540 HV, while the Zr-rich phase exhibited softening with a decrease in hardness to $$\sim $$ ∼ 480 HV. The occurrence of a vortex-like microstructure and the analysis of elemental concentrations indicated a shear-induced mechanical homogenization, which was supposed to be the cause of the observed softening.

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Section: Discussionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Strain-hardening properties of the high-entropy alloy MoNbTaTiVZr processed by high-pressure torsion

Duan

Reiberg

Kutleša

et al. 2021

Continuum Mech. Thermodyn.

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show abstract

“…The HEA thin films are usually nanogranied and have, therefore, a high specific density of GBs. On the other hand, the ultrafine grained bulk HEAs can be produced, for example, by the so-called severe plastic deformation (SPD) [76][77][78]. There are at least hundreds of publications devoted to nanograined HEA thin films and SPD of HEAs.…”

Section: Gb Wetting By Second Solid Phase In Primarily Homogeneous He...mentioning

confidence: 99%

Grain Boundary Wetting by a Second Solid Phase in the High Entropy Alloys: A Review

et al. 2021

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In this review, the phenomenon of grain boundary (GB) wetting by the second solid phase is analyzed for the high entropy alloys (HEAs). Similar to the GB wetting by the liquid phase, the GB wetting by the second solid phase can be incomplete (partial) or complete. In the former case, the second solid phase forms in the GB of a matrix, the chain of (usually lenticular) precipitates with a certain non-zero contact angle. In the latter case, it forms in the GB continuous layers between matrix grains which completely separate the matrix crystallites. The GB wetting by the second solid phase can be observed in HEAs produced by all solidification-based technologies. The particle chains or continuous layers of a second solid phase form in GBs also without the mediation of a liquid phase, for example by solid-phase sintering or coatings deposition. To describe the GB wetting by the second solid phase, the new GB tie-lines should be considered in the two- or multiphase areas in the multicomponent phase diagrams for HEAs. The GB wetting by the second solid phase can be used to improve the properties of HEAs by applying the so-called grain boundary engineering methods.

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“…Another important MPEA system is refractory metal MPEAs system with high strength and melting temperature (more than 1800 °C) containing elements Cr, Hf, Mo, Nb, Ta, Ti, V, W with single BCC phase or BCC ? Laves/B2 phase [21,22]. For instance, Senkov et al fabricated equiatomic NbMoTaW and VNbMoTaW MPEAs with single BCC phase structure using vacuum arc melting and both MPEAs show high yield strength at high temperature (405 MPa and 477 MPa at 1600 °C, respectively) [23].…”

Section: Introductionmentioning

confidence: 99%

Review: Multi-principal element alloys by additive manufacturing

Ferry

Kruzic

et al. 2022

J Mater Sci

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Multi-principal element alloys (MPEAs) have attracted rapidly growing attention from both research institutions and industry due to their unique microstructures and outstanding physical and chemical properties. However, the fabrication of MPEAs with desired microstructures and properties using conventional manufacturing techniques (e.g., casting) is still challenging. With the recent emergence of additive manufacturing (AM) techniques, the fabrication of MPEAs with locally tailorable microstructures and excellent mechanical properties has become possible. Therefore, it is of paramount importance to understand the key aspects of the AM processes that influence the microstructural features of AM fabricated MPEAs including porosity, anisotropy, and heterogeneity, as well as the corresponding impact on the properties. As such, this review will first present the state-of-the-art in existing AM techniques to process MPEAs. This is followed by a discussion of the microstructural features, mechanisms of microstructural evolution, and the mechanical properties of the AM fabricated MPEAs. Finally, the current challenges and future research directions are summarized with the aim to promote the further development and implementation of AM for processing MPEAs for future industrial applications.

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Evolution of microstructure and hardness in Hf25Nb25Ti25Zr25 high-entropy alloy during high-pressure torsion

Cited by 41 publications

References 49 publications

Strain-hardening properties of the high-entropy alloy MoNbTaTiVZr processed by high-pressure torsion

Strain-hardening properties of the high-entropy alloy MoNbTaTiVZr processed by high-pressure torsion

Grain Boundary Wetting by a Second Solid Phase in the High Entropy Alloys: A Review

Review: Multi-principal element alloys by additive manufacturing

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