Application of Correlative Microscopy in Metallurgical Research

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (31 May 2021) | Viewed by 6720

Special Issue Editor


E-Mail Website1 Website2
Guest Editor
Inha University, Incheon, Incheon, South Korea
Interests: : correlative analysis of metallic materials; development and characterization of alloys at elevated temperatures

Special Issue Information

Dear Colleagues,

In the last few decades, numerous studies have been performed to elucidate how the structure–property relationships of metals and alloys are affected by composition, compositional inhomogeneities, impurities, and grain boundaries. These relationships involve a complex interplay of different phases and a detailed atomic-resolution characterization of them is still challenging due to either the limitation of spatial resolution or the inability to quantify light interstitial elements, such as hydrogen and oxygen, during the determination of the atomic structure. To overcome the restrictions arising from individual characterization methods, more progressive efforts require the development of correlative analysis, which confers higher mass resolving power (∆m/m) for light elements (small atomic number, Z) for standard analytical spectroscopic techniques with a combination of high-resolution electron microscopies. This Special Issue will publish work concerning recent progress and trends in the area of correlative analytical methods for characterizing crystal and microstructures along with quantitative compositional measurements from atomic resolution up to the laboratory bulk sample dimension of metals and alloys utilizing a combination of multiple characterizing tools (electron microscopy, atom probe tomography, etc.).

Prof. Dr. Yoon-Jun Kim
Guest Editor

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

  • metals
  • alloys
  • segregation
  • crystal imperfections
  • microstructure
  • advanced electron microscopy
  • tomography
  • multi-scale analysis

Published Papers (2 papers)

Order results
Result details
Select all
Export citation of selected articles as:

Research

11 pages, 2102 KiB  
Article
Mechanisms of Cracking in Laser Welding of Magnesium Alloy AZ91D
by Wei Zhou, Aprilia Aprilia and Chee Kong Mark
Metals 2021, 11(7), 1127; https://doi.org/10.3390/met11071127 - 15 Jul 2021
Cited by 11 | Viewed by 2926
Abstract
Considerable research has been carried out to study the laser welding of magnesium alloys. However, the studies are mainly devoted to butt welding, and there has been limited information in the published literature concerning the bead-on-plate laser welding of AZ91D, even though bead-on-plate [...] Read more.
Considerable research has been carried out to study the laser welding of magnesium alloys. However, the studies are mainly devoted to butt welding, and there has been limited information in the published literature concerning the bead-on-plate laser welding of AZ91D, even though bead-on-plate welding is required for the repair of cast AZ91D parts with surface defects. In the present investigation, surface cracking of the weld metal was observed when an AZ91D magnesium alloy was bead-on-plate welded using the laser welding method. This paper presents the experimental results and analyses to show that the cracking is “solidification cracking” initiated from the weld surface under high thermal stresses. This is in contrast to the “liquation cracking” observed in heat affected zones in tungsten inert gas welding of the same magnesium alloy. Laser power was found to be one of the main factors affecting the distance of the crack propagation. The higher laser power resulted in longer crack propagation distance into the weld metal. It is demonstrated that hot cracking could be avoided by lowering the laser power and welding speed. Full article
(This article belongs to the Special Issue Application of Correlative Microscopy in Metallurgical Research)
Show Figures

Figure 1

15 pages, 6498 KiB  
Article
Effect of Laser Heat-Treatment and Laser Nitriding on the Microstructural Evolutions and Wear Behaviors of AISI P21 Mold Steel
by Won-Sang Shin, Hyun Jong Yoo, Jeoung Han Kim, Jiyeon Choi, Eun-Joon Chun, Changkyoo Park and Yoon-Jun Kim
Metals 2020, 10(11), 1487; https://doi.org/10.3390/met10111487 - 07 Nov 2020
Cited by 5 | Viewed by 3357
Abstract
Laser heat-treatment and laser nitriding were conducted on an AISI P21 mold steel using a high-power diode laser with laser energy densities of 90 and 1125 J/mm2, respectively. No change in surface hardness was observed after laser heat-treatment. In contrast, a [...] Read more.
Laser heat-treatment and laser nitriding were conducted on an AISI P21 mold steel using a high-power diode laser with laser energy densities of 90 and 1125 J/mm2, respectively. No change in surface hardness was observed after laser heat-treatment. In contrast, a relatively larger surface hardness was measured after laser nitriding (i.e., 536 HV) compared with that of the base metal (i.e., 409 HV). The TEM and electron energy loss spectroscopy (EELS) analyses revealed that laser nitriding induced to develop AlN precipitates up to a depth of 15 μm from the surface, resulting in surface hardening. The laser-nitrided P21 exhibited a superior wear resistance compared with that of the base metal and laser heat-treated P21 in the pin-on-disk tribotests. After 100 m of a sliding distance of the pin-on-disk test, the total wear loss of the base metal was measured to be 0.74 mm3, and it decreased to 0.60 mm3 for the laser-nitrided P21. The base metal and laser heat-treated P21 showed similar wear behaviors. The larger wear resistance of the laser-nitrided P21 was attributed to the AlN precipitate-induced surface hardening. Full article
(This article belongs to the Special Issue Application of Correlative Microscopy in Metallurgical Research)
Show Figures

Figure 1

Back to TopTop