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Special Issue "Multi-Functional High Entropy Alloys: Relationship between Microstructure and Property"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Metals and Alloys".

Deadline for manuscript submissions: 20 September 2023 | Viewed by 849

Special Issue Editor

Department of 3D Printing Materials, Korea Institute of Materials Science, Changwon 51508, Republic of Korea
Interests: additive manufacturing; laser welding; heterogeneous structure; microstructure; phase transformation; deformation behavior; mechanical properties
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Special Issue Information

Dear Colleagues,

The emergence of multiprincipal element alloys (MPEAs), known as high-entropy alloys (HEAs) and medium-entropy alloys (MEAs), has significantly increased the possibility of discovering new alloys via traditionally uncommon element grouping. Since this design concept of MPEAs is promising a broad range of compositional flexibility, various MPEAs exhibiting multifunctional performances have been developed over the past two decades. Moreover, beyond the advantages of compositional complexity of this type of alloys, most material scientists have attempted to finetune the microstructure to overcome the limitation of the property window of MPEAs via grain refinement, precipitation hardening, or heterostructuring.

Based on the compositional flexibility of MPEAs, controllable microstructural factors are diverse, and these microstructural factors complicatedly affect the properties of MPEAs. In order to develop a novel strategy for effectively tailoring the multifunctional performance of metallic materials, a comprehensive understanding of the relationship between microstructure and properties is needed. As per the scope of research field mentioned above, the Special Issue on “Multifunctional High-Entropy Alloys: Relationship between Microstructure and Property” will cover but will not be limited to the following topics of MPEAs:

  • Alloying/microstructure design;
  • Heterostructuring;
  • Additive manufacturing;
  • Heterogeneous microstructure;
  • Load-bearing capacity;
  • Functional properties;
  • Structure–property linkage.

It is my pleasure to invite you to submit a manuscript for this Special Issue. We welcome either experimental or theoretical contributions to the above subjects. We hope that the papers published in the Special Issue will advance our understanding of microstructure–property relationships in MPEAs for developing multifunctional metallic materials.

Dr. Jeong Min Park
Guest Editor

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  • alloying/microstructure design
  • heterostructuring
  • additive manufacturing
  • heterogeneous microstructure
  • load-bearing capacity
  • functional properties
  • structure–property linkage

Published Papers (1 paper)

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Deformation Mechanisms and Processing Maps for High Entropy Alloys (Presentation of Processing Maps in Terms of Zener–Hollomon Parameter): Review
Materials 2023, 16(3), 919; - 18 Jan 2023
Viewed by 518
In this review paper, the hot compressive deformation mechanisms and processing maps of high-entropy alloys (HEAs) with different chemical compositions and crystal structures are analyzed. The stress exponent (n1) values measured from the series of compression tests for the HEAs [...] Read more.
In this review paper, the hot compressive deformation mechanisms and processing maps of high-entropy alloys (HEAs) with different chemical compositions and crystal structures are analyzed. The stress exponent (n1) values measured from the series of compression tests for the HEAs performed at different temperatures and strain rates are distributed between 3 and 35, and they are most populated between 3 and 7. Power law breakdown (PLB) is found to typically occur at T/Tm ≤ 0.6 (where T is the testing temperature and Tm is the melting temperature). In AlxCrMnFeCoNi (x = 0–1) and AlxCrFeCoNi (x = 0–1) HEAs, n1 tends to decrease as the concentration of Al increases, suggesting that Al acts as a solute atom that exerts a drag force on dislocation slip motion at high temperatures. The values of activation energy for plastic flow (Qc) for the HEAs are most populated in the range between 300 and 400 kJ/mol. These values are close to the activation energy of the tracer diffusivity of elements in the HEAs ranging between 240 and 408 kJ/mol. The power dissipation efficiency η of the HEAs is shown to follow a single equation, which is uniquely related to n1. Flow instability for the HEAs is shown to occur near n1 = 7, implying that the onset of flow instability occurs at the transition from power law creep to PLB. Processing maps for the HEAs are demonstrated to be represented by plotting η as a function of the Zener–Hollomon parameter (Z = expQcRT, where R is the gas constant). Flow stability prevails at Z ≤ 1012 s−1, while flow instability does at Z ≥ 3 × 1014 s−1. Full article
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