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Novel Materials Synthesis by Mechanical Alloying/Milling (Volume II)
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Novel Materials Synthesis by Mechanical Alloying/Milling (Volume II)

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

Deadline for manuscript submissions: closed (20 May 2022) | Viewed by 5374
Related Special Issue: Novel Materials Synthesis by Mechanical Alloying/Milling in Materials

Special Issue Editors

Prof. Dr. Joan-Josep Suñol

E-Mail Website
Guest Editor
Department of Physics, University of Girona, Campus Montilivi s/n, 17003 Girona, Spain
Interests: Powder Metallurgy; Structural Analysis; Thermal Analysis; Mechanical Alloying; Nanocrystalline
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Lluïsa Escoda

E-Mail Website
Guest Editor
Department of Physics, University of Girona, 17003 Girona, Spain
Interests: mechanical alloying; rapid solidification; thermal analysis; structural analysis; soft magnetism; nanocrystalline; amorphous
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

It is the second Special Issue of this topic. In this Special Issue, the main objectives are to present new scientific and technological issues linked to: a) synthesis and processing in solid-state science and technology; high-energy milling, severe plastic deformation of materials (SPD), and reaction milling, b) new materials: composites, high entropy alloys, and materials for energy, c) structural and functional characterization: microstructure, mechanical properties, thermal stability, and magnetic response, d) new equipment and procedures: milling equipment based on improved milling efficiency, and e) simulation and models of the milling process.

Mechanical alloying/milling (MA/MM) is a versatile process for the production of powders. The size and size distribution of the particles change as a result of continuous fracture and welding. It has been applied to the production of advanced materials such as oxide dispersion-strengthened, amorphous, nanocrystalline, extended solid solutions, metastable phases, new ceramic, metallic, composite materials, pharmaceutical products, and mechanochemical reaction materials. The samples/materials obtained after MA process depends on several parameters as: geometric and dynamic parameters of mill design, the character of motion of milling bodies, the physical and mechanical characteristics of milling bodies, the characteristics of processed substances, a mass ratio of milling bodies to powder, temperature of the vial, milling atmosphere, selection of process control agents, the filling factor of the vial. Moreover, the experimental milling devices to perform the alloying process are very different; attritor, shaker mill, horizontal ball mill, planetary mill, and ball mill controlled by magnetic force. Likewise, the materials are produced directly by mechanical alloying/milling or by combining this technique with other synthesis techniques (spark plasma sintering, HVOF, additive manufacturing, consolidation, sintering) in order to produce bulk alloys, composites, surface layers or foams.

Prof. Dr. Joan-Josep Suñol
Prof. Dr. Lluïsa Escoda
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

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

  • advanced materials
  • functional properties
  • powder metallurgy
  • new materials synthesis
  • modelling
  • milling devices
  • simulation

Published Papers (3 papers)

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Research

11 pages, 1624 KiB  
Article
Microstructure and Magnetic Properties of Nanocrystalline Fe60−xCo25Ni15Six Alloy Elaborated by High-Energy Mechanical Milling
by Nawel Khitouni, Béchir Hammami, Núria Llorca-Isern, Wael Ben Mbarek, Joan-Josep Suñol and Mohamed Khitouni
Materials 2022, 15(18), 6483; https://doi.org/10.3390/ma15186483 - 19 Sep 2022
Cited by 3 | Viewed by 1637
Abstract
In the present work, the effect of Si addition on the magnetic properties of Fe60−xCo25Ni15Six (x = 0, 5, 10, 20, and 30 at%) alloys prepared by mechanical alloying was analyzed by X-ray diffraction and magnetic [...] Read more.
In the present work, the effect of Si addition on the magnetic properties of Fe60−xCo25Ni15Six (x = 0, 5, 10, 20, and 30 at%) alloys prepared by mechanical alloying was analyzed by X-ray diffraction and magnetic vibrating sample magnetometry and SQUID. The crystallographic parameters of the bcc-solid solutions were calculated by Rietveld refinement of the X-ray diffraction patterns with Maud software. Scanning electron microscopy (SEM) was used to determine the morphology of the powdered alloys as a function of milling time. It was found that the Si addition has an important role in the increase of structural hardening and brittleness of the particles (favoring the more pronounced refinement of crystallites). The resulting nanostructure is highlighted in accordance with the concept of the structure of defects. Magnetic properties were related to the metalloid addition, formed phases, and chemical compositions. All processed samples showed a soft ferromagnetic behavior (Hc ≤ 100 Oe). The inhomogeneous evolution of the magnetization saturation as a function of milling time is explained by the magnetostriction effective anisotropy and stress induced during mechanical alloying. Full article
(This article belongs to the Special Issue Novel Materials Synthesis by Mechanical Alloying/Milling (Volume II))
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14 pages, 4915 KiB  
Article
Simulations and Experiments on the Micro-Milling Process of a Thin-Walled Structure of Al6061-T6
by Qi Sun, Jianzhong Zhou and Pengfei Li
Materials 2022, 15(10), 3568; https://doi.org/10.3390/ma15103568 - 17 May 2022
Cited by 5 | Viewed by 1503
Abstract
Aluminum alloy (Al6061-T6) is an alloy with strong corrosion resistance, excellent disassembly, and moderate strength, which is widely used in the fields of construction, automobile, shipping, and aerospace manufacturing. Researching on the influence of machining precision and surface quality on the micro-milling process [...] Read more.
Aluminum alloy (Al6061-T6) is an alloy with strong corrosion resistance, excellent disassembly, and moderate strength, which is widely used in the fields of construction, automobile, shipping, and aerospace manufacturing. Researching on the influence of machining precision and surface quality on the micro-milling process of thin-walled structures of Al6061 is highly significant. Combined with the two simulations (DEFORM-3D simulation and interactive finite element numerical simulation (FEM)) and milling experimental verification, the deformations, errors, and surface quality of milling thin-walled Al6061 were analyzed. The simulations and experimental results show that the deformation of milling a micro thin-walled structure was caused by the vertical stiffness of the thin-walled structure and the cutting force. Surface micromorphology further characterized and showed a poorer quality area, top burr, and concave defects, which directly affect machining quality. It is necessary to improve the surface quality, reduce the surface defects, and increase the stiffness at the top of thin-walled structures in future work. Full article
(This article belongs to the Special Issue Novel Materials Synthesis by Mechanical Alloying/Milling (Volume II))
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12 pages, 3619 KiB  
Article
Wear Mechanism of Multilayer Coated Carbide Cutting Tool in the Milling Process of AISI 4340 under Cryogenic Environment
by Shalina Sheik Muhamad, Jaharah A. Ghani, Che Hassan Che Haron and Hafizal Yazid
Materials 2022, 15(2), 524; https://doi.org/10.3390/ma15020524 - 11 Jan 2022
Cited by 2 | Viewed by 1601
Abstract
Cryogenic technique is the use of a cryogenic medium as a coolant in machining operations. Commonly used cryogens are liquid nitrogen (LN2) and carbon dioxide (CO2) because of their low cost and non-harmful environmental impact. In this study, the effects of [...] Read more.
Cryogenic technique is the use of a cryogenic medium as a coolant in machining operations. Commonly used cryogens are liquid nitrogen (LN2) and carbon dioxide (CO2) because of their low cost and non-harmful environmental impact. In this study, the effects of machining conditions and parameters on the wear mechanism were analysed in the milling process of AISI 4340 steel (32 HRC) under cryogenic conditions using a multilayer coated carbide cutting tool (TiAlN/AlCrN). A field emission scanning electron microscope with energy-dispersive X-ray analysis was used to examine the wear mechanisms comprehensively. At low machining parameters, abrasion and adhesion were the major wear mechanisms which occurred on the rake face. Machining at high machining parameters caused the removal of the coating material on the rake face due to the high temperature and cutting force generated during the cutting process. In addition, it was found that continuously adhered material on the rake face would lead to crater wear. Furthermore, the phenomenon of oxidation was also observed when machining at high cutting speed, which resulted in diffusion wear and increase in the crater wear. Based on the relationship between the cutting force and cutting temperature, it can be concluded that these machining outputs are significant in affecting the progression of tool wear rate, and tool wear mechanism in the machining of AISI 4340 alloy steel. Full article
(This article belongs to the Special Issue Novel Materials Synthesis by Mechanical Alloying/Milling (Volume II))
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