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Crystals
Special Issues
Crystals Dislocation 2022
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Crystals Dislocation 2022

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

Deadline for manuscript submissions: closed (26 July 2023) | Viewed by 4372

Special Issue Editors

Prof. Dr. Guilin Wu

E-Mail Website
Guest Editor
Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China
Interests: high-performance steel materials and preparation; structure regulation and strengthening mechanism of metal structural materials (including nano-metals); metal texture; new technologies and new devices for multi-dimensional and multi-scale characterization of material organization
Dr. Qingqing Sun

E-Mail Website
Guest Editor
School of Materials, Sun Yat-sen University, Shenzhen 518107, China
Interests: crystals dislocation
Dr. Xin Zhang

E-Mail Website
Guest Editor
College of Mechanics and Materials, Hohai University, Nanjing 211100, China
Interests: high-performance steel materials and preparation

Special Issue Information

Dear Colleagues,

The fact that crystals such as metals can be work-hardened has been known and utilized by human kind for thousands of years. However, people didn’t know the reason and mechanism of work-hardening until the discovery of dislocation in 1930s. As a type of line defects, dislocation is strongly related with crystals’ mechanical properties such as strength, toughness, fatigue, fracture, hydrogen embrittlement, stress corrosion cracking, creep, etc. The movement, multiplication, self-organization of dislocations and the interaction of dislocations with other defects such as solutes, second phase particles and grain boundaries are critical to understand the mechanisms of the above-mentioned phenomena. This collection aims to summarize the frontier research on characterization of dislocation evolution in crystals and try to bridge the gap between dislocation structures and various mechanical performances.

Prof. Dr. Guilin Wu
Dr. Qingqing Sun
Dr. Xin Zhang
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

  • crystals dislocation
  • deformation
  • plasticity
  • fracture
  • hydrogen embrittlement
  • SCC

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Published Papers (2 papers)

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Research

14 pages, 6434 KiB  
Article
Phase-Field Crystal Studies on Grain Boundary Migration, Dislocation Behaviors, and Topological Transition under Tension of Square Polycrystals
by Nana Gao, Yan Zhao, Wenqiang Xia, Zhenzhi Liu and Xiaogang Lu
Crystals 2023, 13(5), 777; https://doi.org/10.3390/cryst13050777 - 7 May 2023
Cited by 4 | Viewed by 2332
Abstract
In this paper, the tensile deformation behaviors of polycrystals after relaxation were studied using the phase-field-crystal (PFC) method. Here, the free energy density map characterized the 2D energy distribution of atomic configuration effectively. The application of the Read–Shockley equation distinguished high-energy grain boundary [...] Read more.
In this paper, the tensile deformation behaviors of polycrystals after relaxation were studied using the phase-field-crystal (PFC) method. Here, the free energy density map characterized the 2D energy distribution of atomic configuration effectively. The application of the Read–Shockley equation distinguished high-energy grain boundary (HEGB) and low-energy grain boundary (LEGB) in large-angle grain boundary (LAGB), and they demonstrated different migration behaviors at the early and later stages. The behaviors of small-angle grain boundary (SAGB), including its migration and grains’ rotation, were also studied. Two different mechanisms of dislocation emission and absorption were explored, which demonstrates the possibility of dislocation elevating interfacial energy. The simulated results on the topological transition of grain boundaries prompted us to propose the thinking about the applications of the Neumann–Mullins law and Euler formula. Full article
(This article belongs to the Special Issue Crystals Dislocation 2022)
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14 pages, 6494 KiB  
Article
Study of Microstructure Regulation and In Situ Tensile Performance of Ni-Al Films
by Shipeng Xu, Yuehong Zheng, Jie Sheng, Weiqian Chen, Faqi Zhan and Peiqing La
Crystals 2023, 13(2), 225; https://doi.org/10.3390/cryst13020225 - 25 Jan 2023
Cited by 1 | Viewed by 1563
Abstract
In this paper, Ni-Al films were prepared using magnetron sputtering technology. The microstructure of the films and the relationship between the residual stress and the adhesion strength were studied. More importantly, the mechanical strength–ductility properties of Ni-Al films were evaluated by in situ [...] Read more.
In this paper, Ni-Al films were prepared using magnetron sputtering technology. The microstructure of the films and the relationship between the residual stress and the adhesion strength were studied. More importantly, the mechanical strength–ductility properties of Ni-Al films were evaluated by in situ tensile testing. The results showed that the film mainly consisted of Ni3Al phase and Ni-based solid solution at the low power of Al target. The phase transition occurred, and the NiAl phase appeared when the Al sputtering power was increased. The complex structure, with the coexistence of Ni-based solid solution, Ni3Al, and NiAl phases, possessed increased residual stress and reduced adhesion strength. Meanwhile, the crack was easily penetrated through the inside and outside of the film, falling off during in situ tensile testing. While the small residual stress and large adhesion strength were obtained, only Ni3Al and NiAl coexisted, and the film fell off with difficulty. When the Al sputtering power was 400 W, the film showed the largest adhesion strength and the smallest residual stress. The best comprehensive performance was achieved with a tensile strength of 854 MPa and a yield strength of 90 MPa. The Al content of the film was up to 23.03 at.%, which was beneficial to the application and performance improvement of the film in molten salt corrosion resistance. Full article
(This article belongs to the Special Issue Crystals Dislocation 2022)
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