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Crystals
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Advances in Processing, Simulation and Characterization of Alloys
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Advances in Processing, Simulation and Characterization of Alloys

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

Deadline for manuscript submissions: 20 December 2024 | Viewed by 3716

Special Issue Editors

Dr. Marianthi Bouzouni

E-Mail Website
Guest Editor
1. Department of Physical Metallurgy and Forming, Hellenic Research Centre for Metals S.A.—ELKEME S.A, 61st km Athens-Lamia Nat. Road, 32011 Oinofyta, Greece
2. Laboratory of Physical Metallurgy, Division of Metallurgy and Materials, School of Mining & Metallurgical Engineering, National Technical University of Athens, 9, Her. Polytechniou Str, Zografos, 15780 Athens, Greece
Interests: physical metallurgy; modeling and simulation; microstructures; characterization; alloy design
Prof. Dr. Shouxun Ji

E-Mail Website
Guest Editor
Brunel Centre for Advanced Solidification Technology (BCAST), Brunel University London, Uxbridge UB8 3PH, UK
Interests: solidification of metallic alloys; aluminum alloys; magnesium alloys; phase transformation; microstructure and mechanical properties; dissimilar metals and alloys: microstructure and mechanical properties; laser welding
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The core of physical metallurgy is the processing–microstructure–properties relationship in metals and alloys. Optimum mechanical properties are achieved by obtaining a desired microstructure, which is the result of the development and control of processing routes, as well as careful chemical composition selection. The ever-increasing demand for alloys with mechanical properties fit for purpose that fulfill requirements such as a lightweight design, complex geometry, and endurance in extreme environmental conditions has led to the development of sophisticated processing methods and the incorporation of high-resolution characterization techniques regarding microstructural constituents, even in industrial practices. Moreover, the computational modeling and simulation of processes and microstructures at multi-scale levels is a cost-effective solution, providing insights into how various parameters influence the microstructure–properties relationships in alloy design. Within this context, this Special Issue of Crystals will cover the “Advances in Processing, Simulation and Characterization of Alloys”. The aim of this Special Issue is to bring together experts from academia and industry in order to encapsulate the current state of the art in the fields of processing, modeling, and simulation approaches in manufacturing processes and microstructural evolution, as well as characterization techniques, in order to gain a deeper understanding of properties–microstructure relationships. We welcome submissions in the form of both research articles containing original experimental and/or computational results or review articles.

Dr. Marianthi Bouzouni
Prof. Dr. Shouxun Ji
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 2100 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

  • process optimization
  • mechanical properties
  • microstructures
  • microstructural characterization
  • alloy design
  • modeling and simulation
  • heat treatments
  • finite element analysis (FEA)
  • phase transformations

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Published Papers (3 papers)

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Research

19 pages, 3747 KiB  
Article
Ductility Index for Refractory High Entropy Alloys
by Ottó K. Temesi, Lajos K. Varga, Nguyen Quang Chinh and Levente Vitos
Crystals 2024, 14(10), 838; https://doi.org/10.3390/cryst14100838 - 27 Sep 2024
Viewed by 624
Abstract
The big advantage of refractory high entropy alloys (RHEAs) is their strength at high temperatures, but their big disadvantage is their brittleness at room temperature, which prevents their machining. There is a great need to classify the alloys in terms of brittle-ductile (B-D) [...] Read more.
The big advantage of refractory high entropy alloys (RHEAs) is their strength at high temperatures, but their big disadvantage is their brittleness at room temperature, which prevents their machining. There is a great need to classify the alloys in terms of brittle-ductile (B-D) properties, with easily obtainable ductility indices (DIs) ready to help design these refractory alloys. Usually, the DIs are checked by representing them as a function of fraction strain, ε. The critical values of DI and ε divide the DI—ε area into four squares. In the case of a successful DI, the points representing the alloys are located in the two diagonal opposite squares, well separating the alloys with (B-D) properties. However, due to the scatter of the data, the B-D separation is not perfect, and it is difficult to establish the critical value of DI. In this paper, we solve this problem by replacing the fracture strain parameter with new DIs that scale with the old DIs. These new DIs are based on the force constant and amplitude of thermal vibration around the Debye temperature. All of them are easily available and can be calculated from tabulated data. Full article
(This article belongs to the Special Issue Advances in Processing, Simulation and Characterization of Alloys)
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18 pages, 2934 KiB  
Article
Molecular Dynamics Analysis of Collison Cascade in Graphite: Insights from Multiple Irradiation Scenarios at Low Temperature
by Marzoqa M. Alnairi and Mosab Jaser Banisalman
Crystals 2024, 14(6), 522; https://doi.org/10.3390/cryst14060522 - 30 May 2024
Viewed by 788
Abstract
In our study, we utilize molecular dynamics simulations, specifically through the Reactive Empirical Bond Order, to unravel atomic-scale dynamics in graphite, an essential component in many advanced technologies, under varying irradiation scenarios. We shed light on the behavior of graphite when exposed to [...] Read more.
In our study, we utilize molecular dynamics simulations, specifically through the Reactive Empirical Bond Order, to unravel atomic-scale dynamics in graphite, an essential component in many advanced technologies, under varying irradiation scenarios. We shed light on the behavior of graphite when exposed to Primary Knock-on Atom (PKA) energies of 10, 20, 40, and 80 keV. The findings highlight the radiation vulnerability of graphite, especially when influenced by hydride inclusion. Both pristine graphite and its hydride variant exhibited an increase in Frenkel pairs (FPs) with escalating PKA energies. Notably, carbon PKAs manifested significant FP effects, whereas hydrogen PKAs influenced defect formation through variable diffusivity. In tested radiation scenarios, particularly in Mode C and the R1 region, cascade patterns identified distinct defect forms of diamond-like and elongated-diamond-like shapes, distinct from the typical PKA collision clusters. Furthermore, our cascade findings emphasize the formation of three-coordinated graphite rings, particularly as PKA energies increase. The graphite population statistics reveal a decline in threefold-coordinated atoms and an increase in other types of defects, with 7-carbon atom rings being the most common. Our research highlights the significance of understanding three-coordinated graphite rings, especially as PKA energies rise. Graphite population statistics reveal a decline in threefold-coordinated atoms and a rise in other defects. Notably, 7-carbon atom rings are the most common. From a clustering perspective, self-interstitial atom (SIA) clusters predominated in pristine graphite, while this trend balanced in the hydride variant. Our research highlights the importance of understanding atomic behaviors in graphite under several radiation scenarios. This knowledge is needed for advancing reliable and efficient technological applications, particularly in the field of nuclear technology. Our research underscores the need to understand atomic behaviors in graphite under radiation, paving the way for detailed study on reliable efficient technological applications. Full article
(This article belongs to the Special Issue Advances in Processing, Simulation and Characterization of Alloys)
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21 pages, 24176 KiB  
Article
Effect of Ultrasonic Vibration on Tensile Mechanical Properties of Mg-Zn-Y Alloy
by Wenju Yang, Zhichao Xu, Feng Xiong, Haolun Yang, Xuefeng Guo and Hongshan San
Crystals 2024, 14(1), 39; https://doi.org/10.3390/cryst14010039 - 28 Dec 2023
Cited by 2 | Viewed by 1359
Abstract
Ultrasonic vibration assisted (UVA) plastic forming technology has proven to be a highly effective processing method, particularly for materials that are challenging to deform. In this research, UVA tensile tests were carried out on Mg98.5Zn0.5Y1 alloy at different [...] Read more.
Ultrasonic vibration assisted (UVA) plastic forming technology has proven to be a highly effective processing method, particularly for materials that are challenging to deform. In this research, UVA tensile tests were carried out on Mg98.5Zn0.5Y1 alloy at different vibration frequencies and amplitudes. The experimental results indicate that, compared with conventional tensile tests, the yield strength and tensile strength of Mg98.5Zn0.5Y1 alloy exhibit a decrease. Furthermore, the application of ultrasonic vibration demonstrates an ability to enhance the material’s elongation and plasticity. In order to further predict the stress-strain relationship in the metal tensile process, a hybrid constitutive model coupling the frequency and amplitude of ultrasonic vibration was developed based on the modified Johnson Cook model. The calculated results of the constitutive equation are in good agreement with the experimental results, indicating that the established constitutive equation can accurately predict the trend of alloy stress change at different amplitudes and frequencies. It establishes a theoretical foundation for scrutinizing the deformation mechanisms of the alloy under ultrasonic vibration. Furthermore, Abaqus finite element analysis software was employed to simulate and analyze the UVA tensile process, elucidating the impact of ultrasonic vibration on stress distribution, strain patterns, and material flow in the tensile behavior of Mg98.5Zn0.5Y1 alloys. Full article
(This article belongs to the Special Issue Advances in Processing, Simulation and Characterization of Alloys)
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