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Crystals
Special Issues
Crystallization of High Performance Metallic Materials (II)
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Crystallization of High Performance Metallic Materials (II)

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Metals and Alloys".

Deadline for manuscript submissions: 31 December 2024 | Viewed by 461

Special Issue Editors

Dr. Wangzhong Mu

E-Mail Website
Guest Editor
Department of Materials Science and Engineering, KTH Royal Institute of Technology, Brinellvägen 23, SE-10044 Stockholm, Sweden
Interests: microstructure and property correlation of engineering materials; thermophysical property analysis; in situ characterization; sustainable metallurgy; chemical engineering
Special Issues, Collections and Topics in MDPI journals
Dr. Chao Chen

E-Mail Website
Guest Editor
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Interests: process modeling; clean steel; inclusions; CFD; physical model; tundish; ladle refining; stainless steel
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The Special Issue in Crystals entitled ‘Crystallization of High Performance Metallic Materials’ has attracted a lot of attention in the metallurgy and materials science community; it can be found online at https://www.mdpi.com/journal/crystals/special_issues/G43656XLVO. Therefore, we intend to open a second volume of this topic to continue the collection of research and review articles in the area of crystallization in high-performance metallic materials. Crystallization refers to the process by which a solid phase forms, where atoms or molecules are highly organized into a structure known as a crystal in the matrix. Crystallization of metallic materials normally refers to the solid formed during the solidification as well as the subsequent phase transition. Several fundamental aspects considering thermodynamics and kinetics need to be considered for the crystallization mechanism. For the solidification process, a variety of different morphologies of crystalline can be observed, e.g., columnar and equiaxed crystals and dendrites. This solidification understanding can be applied to the casting process as an industrial crystallization. Subsequently, crystallization behaviors can also refer to microstructure evolution in solid-state materials, e.g., austenite decomposition in low-alloy steels. Nucleation and growth as well as interfacial phenomenon are the two scientific issues included in the crystallization process. The current Special Issue emphasizes crystallization behaviors in high-performance metallic materials. Both solidification and solid-phase transformation are considered, and conventional construction materials, e.g., steels or high-temperature alloys, as well as novel alloy grades, e.g., high entropy alloys, are included. State-of-the-art characterization methods as well as simulation and modelling work regarding crystallization are also included. Finally, particle behaviors associated with crystallization, i.e., non-metallic inclusion and precipitate behaviors during solidification and post-process in high-performance alloys, are included. In addition, the crystallization behavior of slag and heat flux used for metals’ manufacturing is also included. Authors from academia and industry are therefore invited to submit their original research and review contributions on crystallization of high-performance metallic materials to the current Special Issue.

Dr. Wangzhong Mu
Dr. Chao Chen
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. Crystals 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

  • solidification of steels and alloys
  • casting process
  • solid phase transformation
  • high-performance metallic materials
  • in-situ characterization
  • nucleation and growth in metals
  • inclusion/precipitate engineering in steels and alloys
  • slag and flux engineering
  • thermodynamics and kinetics of crystallization
  • process–structure–property correlation in alloys
  • simulations

Published Papers (1 paper)

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Research

14 pages, 8362 KiB  
Article
Effect of Erbium Micro-Additions on Microstructures and Properties of 2024 Aluminum Alloy Prepared by Microwave Sintering
by Tao Qin, Bowen Fan, Jincheng Yu, Chengwei Bu and Jiukun Zhang
Crystals 2024, 14(4), 382; https://doi.org/10.3390/cryst14040382 - 19 Apr 2024
Viewed by 343
Abstract
The effects of rare earth erbium (Er) micro-additions on the microstructures and mechanical properties of 2024 aluminum alloy were investigated. The microstructures and fracture surfaces of specimens prepared via high-energy ball milling, cold isostatic pressing and microwave sintering were carried out by optical [...] Read more.
The effects of rare earth erbium (Er) micro-additions on the microstructures and mechanical properties of 2024 aluminum alloy were investigated. The microstructures and fracture surfaces of specimens prepared via high-energy ball milling, cold isostatic pressing and microwave sintering were carried out by optical microscopy (OM) and scanning electron microscopy (SEM). Under the conditions of sintering heating rate of 20 min/°C and soaking time of 30 min at 490 °C, it was found that with the increase in Er addition, the grain size first decreased then increased, and it reached a minimum size of about 5 μm when the Er content was 0.6%, showing that the grains were refined. At the same time, the compactness and microhardness reached maximum levels, which were 97.6% and 94.5 HV, respectively. Moreover, the tensile strength and elongation reached the peak at 160.5 MPa and 4.4%, respectively. The dynamic mechanical response of Er/2024Al alloy with different Er content was studied through a split Hopkinson pressure bar (SHPB) at strain rates of 600 s−1 and 800 s−1, respectively. Both at the strain rates of 600 s−1 and 800 s−1, the dynamic yield stress of the specimens increased gradually with an increase in Er content. For the 0.6 wt.% Er specimen, the dynamic yield stress reached 371.3 MPa at a strain rate of 800 s−1, which was 28.2% higher than that at a strain rate of 600 s−1. When the strain rate is 800 s−1, the deformation degree of the 0.6 wt.%Er specimen is 55.3%, which is 14.7% higher than for the Er-free one, and there are adiabatic shear bands formed in the 0.6 wt.%Er specimen. Through a fracture analysis of the samples, a certain number of dimples appeared in the fracture of an impact specimen, indicating that the addition of Er improved the toughness of the material. This research can provide a reference for the development and application of high-performance aluminum alloy in automotive structural materials. Full article
(This article belongs to the Special Issue Crystallization of High Performance Metallic Materials (II))
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