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Oxide Dispersion Strengthened High Entropy Alloy and Mechanical Alloying
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Oxide Dispersion Strengthened High Entropy Alloy and Mechanical Alloying

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

Deadline for manuscript submissions: closed (20 September 2023) | Viewed by 1886

Special Issue Editor

Prof. Dr. Chun-Liang Chen

E-Mail Website
Guest Editor
Department of Materials Science and Engineering, National Dong Hwa University, Hualien 97401, Taiwan
Interests: mechanical alloying; oxide dispersion strengthened alloys; high-entropy alloys; high-temperature alloys; nuclear structural materials; friction stir welding
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Materials fabricated using mechanical alloying (MA) contribute significantly to industrial applications. They represent a highly diverse and strongly multidisciplinary area, with links to numerous industrial sectors such as aerospace, energy, construction, automotive, transport, packaging, security, and defense. Mechanical alloying is considered the most appropriate processing method for producing oxide dispersion strengthened (ODS) alloys, which exhibit good creep resistance, thermal stability, wear resistance, and oxidation resistance, among other beneficial properties. In recent years, high-entropy alloys (HEAs) have arisen as a new class of metallic alloys in which the formation of a solid solution rather than intermetallic compounds is favored. Thus, ODS-HEAs are promising structural materials for applications requiring high temperature and radiation resistance due to the high configurational entropy and pinning effect of their dispersed oxide particles, which restrict dislocation motion and restrain grain growth. This Special Issue will consider all aspects of theory, methods, materials, and applications of mechanical alloying. Contributions on the following topics are encouraged:

  • Synthesis and processing in solid-state science and technology: sequential alloying, high-energy milling, reaction milling;
  • New materials/in situ formation: oxide dispersion strengthened (ODS) alloys, high-entropy alloys, nanocomposites, and in situ formation of nanodispersoids;
  • Structural characterization: mechanically induced structural changes in materials (point defects, dislocations, clusters, precipitates, grain boundaries), surfaces, and interfaces in activated solids;
  • New equipment and procedures: milling equipment based on improved milling dynamics, processing optimization, and milling contamination.

Prof. Dr. Chun-Liang Chen
Guest Editor

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • mechanical alloying
  • oxide dispersion strengthened alloys
  • high-entropy alloys
  • in situ formation
  • sequential alloying
  • nanocomposites

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Published Papers (2 papers)

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Research

10 pages, 10859 KiB  
Article
Effects of Alloying Elements and Mechanical Alloying on Characteristics of WVTaTiCr Refractory High-Entropy Alloys
by Chun-Liang Chen and Jyun-Hong Lin
Materials 2023, 16(18), 6194; https://doi.org/10.3390/ma16186194 - 13 Sep 2023
Cited by 3 | Viewed by 1248
Abstract
Refractory high-entropy alloys (RHEAs) are among the promising candidates for the design of structural materials in advanced nuclear energy systems. The effects of Cr, V, Ta, and Ti elements and ball milling on the microstructural evolution and mechanical properties of model RHEAs were [...] Read more.
Refractory high-entropy alloys (RHEAs) are among the promising candidates for the design of structural materials in advanced nuclear energy systems. The effects of Cr, V, Ta, and Ti elements and ball milling on the microstructural evolution and mechanical properties of model RHEAs were investigated. The results show that W-rich BCC1 and Ta-rich BCC2 solid solution phases were generated after a long milling duration. After high-temperature sintering, the (Cr, Ta)-rich phase associated with the Laves phase was observed in the Cr-containing model RHEAs. In addition, a high level of Ti, Ta, and V contents promoted the in situ formation of oxide particles in the alloys. Complex TiTa2O7 and Ta2VO6 oxide phases were identified by TEM, which suggests a solid-state reaction of Ti-O, Ta-O, and V-O subjected to high-energy ball milling. The oxide particles are uniformly dispersed in the BCC matrix, which can result in dispersion strengthening and the enhancement of mechanical properties. Full article
(This article belongs to the Special Issue Oxide Dispersion Strengthened High Entropy Alloy and Mechanical Alloying)
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28 pages, 12762 KiB  
Article
Formation and Microstructural Evolution of Ferritic ODS Steel Powders during Mechanical Alloying
by Krzysztof Nowik, Rafał Zybała and Zbigniew Oksiuta
Materials 2023, 16(2), 765; https://doi.org/10.3390/ma16020765 - 12 Jan 2023
Cited by 6 | Viewed by 1694
Abstract
Ferritic ODS steel elemental powder compositions with various Zr content (0.3–1.0 wt.%), ground in a Pulverisette 6 planetary ball mill, were extensively studied by X-ray diffraction line profile analysis, microscopic observations, microhardness testing and particle size measurements. A characteristic three-stage process of flattening [...] Read more.
Ferritic ODS steel elemental powder compositions with various Zr content (0.3–1.0 wt.%), ground in a Pulverisette 6 planetary ball mill, were extensively studied by X-ray diffraction line profile analysis, microscopic observations, microhardness testing and particle size measurements. A characteristic three-stage process of flattening the soft powders, formation of convoluted lamellae and, finally, formation of nanocrystalline grains was observed. In order to quantify the microstructural properties, expressed mainly in terms of crystallite size and dislocation density, a methodology for detailed and accurate microstructure analysis of nanosized and severely deformed materials was proposed by the Whole Powder Pattern Modelling (WPPM) approach. In the case of the proposed ODS alloy composition, the overlapping of Fe and Cr Bragg reflections makes the microstructure analysis certainly more complicated. The results showed that the microstructure of powders evolved towards the nanocrystalline state consisting of fine (diameter of ~15 nm) and narrowly dispersed domains, with extensive dislocation density exceeding 1016 m−2. Full article
(This article belongs to the Special Issue Oxide Dispersion Strengthened High Entropy Alloy and Mechanical Alloying)
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