Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
4.4
2.9
Journals
Metals
Special Issues
Advances in Microstructural Characterization of Metallic Alloys (2nd Edition)
share announcement

Advances in Microstructural Characterization of Metallic Alloys (2nd Edition)

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Crystallography and Applications of Metallic Materials".

Deadline for manuscript submissions: closed (28 February 2024) | Viewed by 2550

Special Issue Editors

Prof. Dr. Heinz-Günter Brokmeier

E-Mail Website
Guest Editor
1. Institute of Materials Science and Engineering, Department TEXMAT, Clausthal University of Technology, Agricolastrasse 6, D-38678 Clausthal-Zellerfeld, Germany
2. Helmholtz Zentrum Geesthacht, Max Planck Straße 1, Geb. 33, D-21502 Geesthacht, Germany
Interests: crystallographic texture; materials characterization using X-rays; neutrons; synchrotrons and EBSD; instrumentation for in situ analytics; phase evolution; residual stresses
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Raúl Eduardo Bolmaro

E-Mail Website
Guest Editor
Rosario Institute of Physics, Blvd. 27 de Febrero 210 Bis, Rosario- Santa Fe 2000, Argentina
Interests: metallurgy; recrystallization; crystallography; textures; synchrotron radiation and neutron diffraction characterization; electron backscatter diffraction; X-ray diffraction
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Microstructures are essential information in all fields of metallic, ceramic, and geoscientific work. Microstructural investigations are used in development projects, industrial applications, and in case of damage. Therefore, microstructural characterization is a key factor in understanding the behavior of any type of material.

Existing methods using optical techniques, X-ray, neutron and synchrotron diffraction, and electron back scattering diffraction provide a wide range of information about microstructure. This includes not only the 2D or 3D microstructure but also microstructural information such as defects, crystal orientations, residual stresses, grain size distribution, or grain boundary discussions. The challenges for investigation are constantly increasing due to new challenges regarding the detection limit, regarding new multiphase systems, regarding nanostructures, regarding time-resolved analytics, etc.

The challenges both from the material side (new alloys, lighter materials, and high-strength materials) and from the new fields of application of known materials (energy technology, medical technology, and environmental technology) are increasing. Therefore, this Special Issue addresses all fields of modern and advanced investigations of microstructures, further developments of measurement methods to determine the microstructure, the comparison of measurement methods, the use for lifetime predictions, and damage assessments.  

Prof. Dr. Heinz-Günter Brokmeier
Prof. Dr. Raúl Eduardo Bolmaro
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. Metals is an international peer-reviewed open access monthly 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

  • 2D microstructure
  • 3D microstructure
  • electron-back-scatter diffraction (EBSD)
  • in situ diffraction
  • new alloys and ceramics
  • defects
  • crystallographic textures
  • multi-phase systems
  • UFGs

Published Papers (2 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

22 pages, 14178 KiB  
Article
Study of Galena Ore Powder Sintering and Its Microstructure
by Bety S. Al-Saqarat, Ahmed Al-Mobydeen, Yousef Al-Dalahmeh, Ahmed N. AL-Masri, Abdelmnim M. Altwaiq, Imad Hamadneh, Qusay Abu-Afifeh, Mutaz M. Zoubi, Muayad Esaifan, Iessa Sabbe Moosa and Ehab AlShamaileh
Metals 2024, 14(4), 439; https://doi.org/10.3390/met14040439 - 10 Apr 2024
Viewed by 451
Abstract
Galena is a natural mineral enriched with lead sulfide (PbS). It typically forms in hydrothermal veins associated with igneous rocks and can also occur as a gangue mineral in other ore deposits. PbS is of special importance for scientific research applications due to [...] Read more.
Galena is a natural mineral enriched with lead sulfide (PbS). It typically forms in hydrothermal veins associated with igneous rocks and can also occur as a gangue mineral in other ore deposits. PbS is of special importance for scientific research applications due to the possibility of tuning its semiconductor energy gap using nanotechnology in conjunction with powder metallurgy as an easy, controllable production route. In this paper, almost pure PbS was successfully produced starting from a high ratio of PbS phase galena ore. As-received galena lumps were roughly pulverized and milled to produce four particle size ranges of 38, 63, 125, and 250 µm prior to compaction and sintering in a vacuum (pre-flushed with argon gas). SEM coupled with the EDAX analysis unit was employed to investigate the microstructure and chemical composition of the as-received galena and the subsequent products after sintering. The chemical analysis confirmed the high ratio of PbS compound in the as-received galena and sintered products with approximately 85% Pb and 13% S mass ratio. The sintering process of the galena powder was carried out at different values of temperature, time, and compaction pressure. Additionally, the effect of length to diameter ratio of compacted and sintered samples was investigated. XRD analysis confirmed the existence of the PbS phase in the as-received and sintered samples at 700 °C with approximately 98 wt.%, as well as a new phase that is formed at 800 °C with a lower percentage. The micro-hardness of the as-received and sintered samples was measured and compared with the as-received galena ore. The results showed a significant reduction in the hardness of sintered galena powder compared with the bulk as-received galena by 52%. Furthermore, a relative sintered density of 99.3% for the as-received galena density signifies a novel result using powder metallurgy techniques. Full article
(This article belongs to the Special Issue Advances in Microstructural Characterization of Metallic Alloys (2nd Edition))
►▼ Show Figures

Figure 1

15 pages, 4471 KiB  
Article
Microstructure Formation and Carbon Partitioning with Austenite Decomposition during Isothermal Heating Process in Fe-Si-Mn-C Steel Monitored by In Situ Time-of-Flight Neutron Diffraction
by Yusuke Onuki, Kazuki Umemura, Kazuki Fujiwara, Yasuaki Tanaka, Toshiro Tomida, Kaori Kawano and Shigeo Sato
Metals 2022, 12(6), 957; https://doi.org/10.3390/met12060957 - 02 Jun 2022
Cited by 4 | Viewed by 1880
Abstract
Retained austenite is a key feature used to realize the transformation-induced plasticity in bainitic high strength steels. In this study, the authors focused on the formation of metastable austenite in Fe-0.61C-1.9Si-0.98Mn (mass%) during isothermal heating processes using in situ neutron diffraction techniques. Quantitative [...] Read more.
Retained austenite is a key feature used to realize the transformation-induced plasticity in bainitic high strength steels. In this study, the authors focused on the formation of metastable austenite in Fe-0.61C-1.9Si-0.98Mn (mass%) during isothermal heating processes using in situ neutron diffraction techniques. Quantitative discussion of carbon partitioning processes is enabled by applying an in situ phase fraction analysis considering crystallographic textures, in addition to the carbon concentration estimation based on the lattice parameter of austenite. The carbon partitioning behavior is inhomogeneous, resulting in a bimodal carbon concentration distribution in austenite. The carbon enriched, high carbon austenite is stable during isothermal heating at 673 K and is retained even after cooling to room temperature. The remainder is low carbon austenite, which is gradually consumed by bainite transformation. Above 723 K, the high carbon austenite also decomposes to ferrite and cementite due to the fast diffusion of Si. Conversely, below 623 K, cementite is stabilized even without the diffusion of Si. These cementite formation mechanisms prevent the formation and retention of high carbon austenite. The inhomogeneous carbon distribution and cementite formation must be carefully considered to precisely predict the microstructure formation in Si-added bainitic steels. Full article
(This article belongs to the Special Issue Advances in Microstructural Characterization of Metallic Alloys (2nd Edition))
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-2
Back to TopTop