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Crystals
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Dislocations and Twinning in Metals and Alloys
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Dislocations and Twinning in Metals and Alloys

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

Deadline for manuscript submissions: closed (20 April 2024) | Viewed by 4703

Special Issue Editors

Dr. Qi Zhu

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Guest Editor
School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore
Interests: interface kinetics; in situ TEM; nanomechanics; metals and alloys
Dr. Yejun Gu

E-Mail Website
Guest Editor
Institute of High Performance Computing, A*STAR, Singapore 138632, Singapore
Interests: computational materials sciences; modelling and simulation; plasticity; metals and alloys
Dr. Dinh-Phuc Tran

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Guest Editor
Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
Interests: mechanical properties; nanotwinned metals; numerical analysis; Cu-Cu bonding; fracture mechanics; electromigration

Special Issue Information

Dear Colleagues,

Crystalline defects endow materials with diverse microstructural characters, which enable the tuneable modification of the material’s properties. Dislocations and twin boundaries (TBs) are two common types of crystalline defects in metals and alloys that have significant influence on their properties. The past few decades have witnessed eminent progress in the design and deployment of metals and alloys with superior performances by tuning their dislocations and/or TB microstructures. Recent advances in microstructural characterisation techniques and modelling methodologies further facilitate our understanding of the structure–behaviour–property relation associated with dislocations and TBs. In this Special Issue, we aim to collect a wide spectrum of articles that elucidate the contributions of dislocations and/or TBs to the behaviours and properties of metals and alloys, which includes, but is not limited to, the following topics: (a) the interaction between dislocations, TBs and other defects, such as grain boundaries and precipitates; (b) the correlation between plastic deformation mechanisms and mechanical properties in nano-twinned structures; (c) deformation twinning mechanisms in metals and alloys. Experimental and/or computational investigations of plastic deformation related to dislocations and TBs are welcome. Submissions that combine experimental observations and simulation approaches are encouraged.

Dr. Qi Zhu
Dr. Yejun Gu
Dr. Dinh-Phuc Tran
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

  • crystalline defect
  • dislocation
  • twinning
  • twin boundary
  • metals and alloys
  • interaction
  • plastic deformation
  • mechanical property
  • microstructural characterization
  • modelling
  • simulation

Published Papers (4 papers)

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Research

13 pages, 6779 KiB  
Article
Molecular Dynamics Simulation of the Interaction between Dislocations and Iron–Vanadium Precipitates in Alpha Iron: Effect of Chemical Composition
by Sepehr Yazdani, Mohsen Mesbah and Veronique Vitry
Crystals 2023, 13(8), 1247; https://doi.org/10.3390/cryst13081247 - 12 Aug 2023
Cited by 2 | Viewed by 747
Abstract
In this study, molecular dynamics simulations were employed to study the interaction between dislocations with Fe-V precipitate with different vanadium concentrations. Increasing the vanadium concentration in the precipitate results in a strong interaction between the dislocations and the precipitate, and the dislocation line [...] Read more.
In this study, molecular dynamics simulations were employed to study the interaction between dislocations with Fe-V precipitate with different vanadium concentrations. Increasing the vanadium concentration in the precipitate results in a strong interaction between the dislocations and the precipitate, and the dislocation line bows out more as a result of increasing the energy of the dislocation line, and the critical stress needed for depinning the dislocations increases. However, at a low vanadium concentration (1:3 atomic ratio) the dislocations cut through the precipitate without changing the speed. An increasing vanadium concentration not only affects the dislocation shape and movement speed, but also affects the configuration of the junction between the a/2[111] and a/2[100] dislocations, and the void formation after the cutting process. The formation of strong junctions and a high number of voids locks the a/2[111] dislocation motion, and increases the strength of the alloy. The results of the radial distribution function before and after the cutting process show that the structure of the precipitate changes from crystalline to amorphous, and the degree of amorphization decreases with an increasing vanadium concentration. Full article
(This article belongs to the Special Issue Dislocations and Twinning in Metals and Alloys)
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10 pages, 2530 KiB  
Article
In Situ Observation of High Bending Strain Recoverability in Au Nanowires
by Lingyi Kong, Guang Cao, Haofei Zhou and Jiangwei Wang
Crystals 2023, 13(8), 1159; https://doi.org/10.3390/cryst13081159 - 26 Jul 2023
Cited by 1 | Viewed by 724
Abstract
Metallic nanowires (NW) usually exhibit unique physical, mechanical, and chemical properties compared to their bulk counterparts. Despite extensive research on their mechanical behavior, the atomic-scale deformation mechanisms of metallic nanowires remain incompletely understood. In this study, we investigate the deformation behavior of Au [...] Read more.
Metallic nanowires (NW) usually exhibit unique physical, mechanical, and chemical properties compared to their bulk counterparts. Despite extensive research on their mechanical behavior, the atomic-scale deformation mechanisms of metallic nanowires remain incompletely understood. In this study, we investigate the deformation behavior of Au nanowires embedded with a longitudinal twin boundary (TB) under different loading rates using in situ nanomechanical testing integrated with atomistic simulations. The Au nanowires exhibit a recoverable bending strain of up to 27.5% with the presence of TBs. At low loading rates, the recoverable bending is attributed to the motion of stacking faults (SFs) and their interactions with TBs. At higher loading rates, the formation of high-angle grain boundaries and their reversible migration become dominant in Au nanowires. These findings enhance our understanding of the bending behavior of metallic nanowires, which could inspire the design of nanodevices with improved fatigue resistance and a large recoverable strain capacity. Full article
(This article belongs to the Special Issue Dislocations and Twinning in Metals and Alloys)
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30 pages, 8022 KiB  
Article
Self-Consistent Crystal Plasticity Modeling of Slip-Twin Interactions in Mg Alloys
by Mukti Patel, YubRaj Paudel, Shiraz Mujahid, Hongjoo Rhee and Haitham El Kadiri
Crystals 2023, 13(4), 653; https://doi.org/10.3390/cryst13040653 - 10 Apr 2023
Cited by 3 | Viewed by 1463
Abstract
Parsing the effect of slip-twin interactions on the strain rate and thermal sensitivities of Magnesium (Mg) alloys has been a challenging endeavor for scientists preoccupied with the mechanical behavior of hexagonal close-packed alloys, especially those with great latent economic potential such as Mg. [...] Read more.
Parsing the effect of slip-twin interactions on the strain rate and thermal sensitivities of Magnesium (Mg) alloys has been a challenging endeavor for scientists preoccupied with the mechanical behavior of hexagonal close-packed alloys, especially those with great latent economic potential such as Mg. One of the main barriers is the travail entailed in fitting the various stress–strain behaviors at different temperatures, strain rates, loading directions applied to different starting textures. Taking on this task for two different Mg alloys presenting different textures and as such various levels of slip-twin interactions were modeled using visco-plastic self-consistent (VPSC) code. A recently developed routine that captures dislocation transmutation by twinning interfaces on strain hardening within the twin lamellae was employed. While the strong texture was exemplified by traditional rolled AZ31 Mg alloys, the weak texture was represented by ZEK100 Mg alloy sheets. The transmutation model incorporated within a dislocation density based hardening model showed enhanced flexibility in predicting the complex strain rate and thermal sensitive behavior of Mg textures’ response to various mechanical loading schemes. Full article
(This article belongs to the Special Issue Dislocations and Twinning in Metals and Alloys)
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15 pages, 13211 KiB  
Article
Dependence of Charpy Impact Properties of Fe-30Mn-0.05C Steel on Microstructure
by Jianchao Xiong, Heng Li, Ling Kong, Xiaodan Zhang, Wenquan Cao and Yuhui Wang
Crystals 2023, 13(2), 353; https://doi.org/10.3390/cryst13020353 - 18 Feb 2023
Cited by 2 | Viewed by 1338
Abstract
Fe-30Mn-0.05C steel specimens with cold-rolled, partially recrystallized, fine-grained, and coarse-grained microstructures were fabricated by means of 80% cold rolling followed by annealing at 550–1000 °C. The initial and deformed microstructures were characterized, and the Charpy impact properties were tested at room temperature (RT) [...] Read more.
Fe-30Mn-0.05C steel specimens with cold-rolled, partially recrystallized, fine-grained, and coarse-grained microstructures were fabricated by means of 80% cold rolling followed by annealing at 550–1000 °C. The initial and deformed microstructures were characterized, and the Charpy impact properties were tested at room temperature (RT) and liquid nitrogen temperature (LNT). It was found that the Charpy absorbed energy increased with the annealing temperature, while the specimens showed different trends: parabolic increase at RT and exponential increase at LNT, respectively. Compared with the fully recrystallized specimens, those with a partially recrystallized microstructure exhibited lower impact energy, especially at LNT. This was because cracks tended to nucleate and propagate along the recovery microstructure where stress concentration existed. The grain size played an important role in the twinning behavior and impact properties. High Charpy impact energy (~320 J) was obtained in the coarse-grained specimen having the grain size of 42.1 μm at both RT and LNT, which was attributed to the activation of high-density deformation twinning. However, deformation twinning was inhibited in the specimen with the average grain size of 3.1 μm, resulting in limited work hardening and lower impact energy. Full article
(This article belongs to the Special Issue Dislocations and Twinning in Metals and Alloys)
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