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Special Issue "Deformation Behavior and Mechanical Properties of High Entropy Alloys"

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A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Entropic Alloys and Meta-Metals".

Deadline for manuscript submissions: 30 November 2023 | Viewed by 2648

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Prof. Dr. Linlin Li

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Guest Editor

The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, China
Interests: fatigue properties of metallic materials; fatigue cracking behavior of grain boundaries and twin boundaries; high-entropy alloys; grain boundary segregation; size effect of material deformation

Special Issue Information

Dear Colleagues,

As a new type of metallic material, high-entropy alloys (HEAs) usually exhibit excellent mechanical properties, so they have received much attention in materials science and engineering. Furthermore, because there are more metastable states of HEAs than the traditional alloys during processing, corresponding mechanical properties can be obtained under different external conditions.

This Special Issue of Metals will focus on the microstructure, deformation behaviors, and mechanical properties of high-entropy alloys under different conditions, including but not limited to dislocation slip and twinning, grain boundary segregation, precipitation and phase transformation, low-temperature/high-temperature deformation, corrosion, wear, fatigue, etc.; and various methods for strengthening and toughening. The scope will cover fundamental research and all other aspects of alloy preparation, heat treatment, computer simulation, and engineering applications.

We are pleased to invite you to submit manuscripts to this Special Issue and share research results.

Prof. Dr. Linlin Li
Guest Editor

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Keywords

high-entropy alloys (HEAs)
processing
microstructure
deformation
mechanical properties

Published Papers (4 papers)

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Research

Open AccessCommunication

Eutectic MoNbTa(WC)_x Composites with Excellent Elevated Temperature Strength

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Metals 2023, 13(4), 687; https://doi.org/10.3390/met13040687 - 30 Mar 2023

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Abstract

To develop materials with a promising utilization future in the extreme environments of aerospace, the MoNbTa(WC)_x composites were prepared by vacuum arc melting, of which the crystal structure, microstructure, and compression properties at elevated temperature were investigated. The MoNbTa(WC)_x composites had eutectic structures that consisted of body-centered cubic (BCC) phase and eutectoid structures. The lamellar fine eutectoid structures were composed of BCC-structured high entropy alloy (HEA) Mo-Nb-Ta-W and FCC-structured carbide Mo-Nb-Ta-W-C. It was demonstrated that the ductility and elevated temperature strength was enhanced simultaneously combined with the effect of eutectic structures and WC addition. The optimal true yield strength and true fracture strain reached 1205 MPa and 29.2% in MoNbTa(WC)_0.9 at 1200 °C, meanwhile, the fracture strain at ambient temperature was 13.96%. Distinct strain hardening was observed at the initial deformation stage of MoNbTa(WC)_0.9 at 1200 °C. The compression performances of MoNbTa(WC)_x were superior in comparison with most refractory high entropy alloys. Full article

(This article belongs to the Special Issue Deformation Behavior and Mechanical Properties of High Entropy Alloys)

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Open AccessCommunication

Microstructural Evolution of Shear Localization in High-Speed Cutting of CoCrFeMnNi High-Entropy Alloy

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Metals 2023, 13(4), 647; https://doi.org/10.3390/met13040647 - 24 Mar 2023

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Abstract

Shear localization is one of the most important failure mechanisms subjected to high-strain-rate deformation and has significant effects on the process, plastic deformation, and catastrophic failure of a material. Shear localization was observed in serrated chips produced during the high-speed cutting of the CoCrFeMnNi high-entropy alloy. Electron backscatter diffraction was performed to systematically investigate microstructural evolution during shear banding. The elongation and subdivision of the narrow grains were observed in the areas adjacent to the shear band. The microstructure inside the shear band was found to be composed of equiaxed ultrafine grains. The results reveal that grain subdivision and dynamic recrystallization might have significant roles in the microstructural evolution of shear bands. These results offer key insights into our understanding of shear localization and high-speed machining behavior for high entropy alloys. Full article

(This article belongs to the Special Issue Deformation Behavior and Mechanical Properties of High Entropy Alloys)

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Effect of the Synthesis Route on the Microstructure of Hf_xTi_(1−x)NbVZr Refractory High-Entropy Alloys

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Metals 2023, 13(2), 343; https://doi.org/10.3390/met13020343 - 08 Feb 2023

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Abstract

In the present work, the effects of (i) Ti replacement by Hf and (ii) the synthesis method on microstructure and crystal structure evolution in the high-entropy alloy Hf_xTi_(1−x)NbVZr are reported. The results of scanning electron microscopy and X-ray diffraction analysis of alloys prepared by both arc-melting and induction-melting are compared with theoretical thermodynamic calculations using the CALPHAD approach. The non-equilibrium thermodynamic calculations agree well with the experimental observations for the arc-melted alloys: a mixture of body-centered cubic (BCC) and cubic C15 Laves phases occurs for low-Ti-concentration alloys and a single BCC phase is obtained for high-Ti alloys. The agreement is not as good when using the induction-melting method: equilibrium solidification calculations predict that the most stable state is a phase mixture of BCC, hexagonal close-packed, and a cubic C15 Laves phase, while experimentally only one BCC and one hexagonal C14 Laves phase were found. The estimation of the exact cooling rate and the lack of a thermodynamic database can explain the difference. In addition, for both methods, the thermodynamic calculation confirms that for a high Ti concentration, the BCC phase is stable, whereas phase separation is enhanced with a higher Hf concentration. Full article

(This article belongs to the Special Issue Deformation Behavior and Mechanical Properties of High Entropy Alloys)

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Open AccessArticle

Crystal Plasticity Model Analysis of the Effect of Short-Range Order on Strength-Plasticity of Medium Entropy Alloys

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Metals 2022, 12(10), 1757; https://doi.org/10.3390/met12101757 - 19 Oct 2022

Cited by 1 | Viewed by 766

Abstract

Numerous studies have demonstrated the widespread presence of chemical short-range order (SRO) in medium and high entropy alloys (M/HEAs). However, the mechanism of their influence on macroscopic mechanical behavior remains to be understood. In this paper, we propose a novel dislocation-based model of crystal plasticity, by considering both the dislocation blocking and coplanar slip induced by SRO. The effect of SRO on the plastic deformation of CoCrNi MEAs was investigated. We found that the yield strength increases monotonically with increasing SRO-induced slip resistance, but the elongation first appeared to increase and then decreased. Further analysis suggested that the plastic elongation is a result of the competition between grain rotation-induced deformation coordination and stress concentration, which depends on the slip resistance of the SRO. Full article

(This article belongs to the Special Issue Deformation Behavior and Mechanical Properties of High Entropy Alloys)

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