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Metals
Special Issues
Microstructure and Mechanical Properties of Nanoscale Metallic Materials
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Microstructure and Mechanical Properties of Nanoscale Metallic Materials

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Structural Integrity of Metals".

Deadline for manuscript submissions: closed (31 March 2022) | Viewed by 7587

Special Issue Editors

Prof. Dr. Jiangwei Wang

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Guest Editor
School of Materials Science and Engineering, Zhejiang University, Hangzhou, China
Interests: structure–property relationships of nanostructured materials; nanomechanics; energy materials; in situ TEM; metallurgy
Prof. Dr. Yang Lu

E-Mail Website
Guest Editor
Department of Mechanical Engineering, the City University of Hong Kong, Hong Kong 999077, China
Interests: micro/nanomechanics; in situ electron microscopy; elastic strain engineering; wide-bandgap semiconductor; bio-inspired materials design; nanomanufacturing
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Haofei Zhou

E-Mail Website
Guest Editor
School of Aeronautics and Astronautics, Zhejiang University, Hangzhou, China
Interests: micro-nanomechanics; multiscale mechanics; intelligent materials, structures, and microrobots

Special Issue Information

Dear Colleagues,

Nanoscale metallic materials exhibit a range of excellent mechanical properties, including ultrahigh strength, large elastic strain limit, and high deformation reversibility. These unique mechanical properties make nanoscale metallic materials potential candidates in the applications of novel micro/nano electromechanical systems (MEMS/NEMS). Under service conditions, the microstructures of nanoscale metallic materials change dynamically with the applied external loading, which inevitably induces mechanical degradation. As damage accumulates, metallic nanocomponents may lose their structural stability, as well as functional properties. Therefore, a fundamental understanding of the microstructure–mechanical property relationship of nanoscale/nanostructured metallic materials, especially at the atomic scale, is of both scientific and technological significance for the development of damage-tolerant metallic nanomaterials and devices. Recent developments of atomistic simulations and in situ nanomechanical testing/manipulation provide great opportunities to investigate the mechanical behavior of nanoscale metallic materials, as demonstrated by a wealth of novel deformation behaviors and size effects in small-volume metallic materials.

This Special Issue focuses on recent advances in the microstructure and mechanical properties of nanoscale metallic materials/devices, involving experimental, theoretical, and computational investigations. Reviews and articles on various aspects of microstructures, mechanical property, deformation mechanism, and nanomechanical testing methodology are welcomed.

Prof. Dr. Jiangwei Wang
Prof. Dr. Yang Lu
Prof. Dr. Haofei Zhou
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. 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

  • Nanoscale metallic materials
  • Micro- and nano-architected materials
  • Nanostructured high-entropy alloys
  • Microstructure
  • Mechanical properties
  • Plasticity
  • Defects
  • Interface
  • Phase transformation
  • Size effect
  • Surface

Published Papers (3 papers)

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Research

14 pages, 3097 KiB  
Article
Atomistic Investigation on the Strengthening Mechanism of Single Crystal Ni-Based Superalloy under Complex Stress States
by Bin Xie, Xinyu Wang, Yongsheng Fan and Ruizhi Li
Metals 2022, 12(5), 889; https://doi.org/10.3390/met12050889 - 23 May 2022
Cited by 4 | Viewed by 2023
Abstract
Single crystal Ni-based superalloy, with excellent mechanical properties in high temperature, always works under complex stress states, including multiaxial tension and compression, which results in various strengthening mechanisms. In this paper, the atomistic simulation is applied to investigate the microstructure evolution under complex [...] Read more.
Single crystal Ni-based superalloy, with excellent mechanical properties in high temperature, always works under complex stress states, including multiaxial tension and compression, which results in various strengthening mechanisms. In this paper, the atomistic simulation is applied to investigate the microstructure evolution under complex mechanical loading conditions, including uniaxial, equibiaxial, and non-equibiaxial tensile–compressive loadings. By comparison of the strain–stress curves and analysis of dislocation motion, it is believed that the tension promotes the bowing out of dislocations into the channel at loading direction, while compression limits it. Moreover, the dislocation analysis shows that the initial dislocation network, comprised of Lomer dislocations, will dissociate to form Lomer–Cottrell lock upon loading, which acts as a barrier to the further glide of dislocations. The mechanism of dislocation evolution is analyzed in detail by combining Schmid factor analysis and the comparison of energy density difference between γ and γ′ phases. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Nanoscale Metallic Materials)
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10 pages, 2092 KiB  
Article
Interactions between Dislocations and Penta-Twins in Metallic Nanocrystals
by Yingbin Chen, Qishan Huang, Shuchun Zhao, Haofei Zhou and Jiangwei Wang
Metals 2021, 11(11), 1775; https://doi.org/10.3390/met11111775 - 4 Nov 2021
Cited by 2 | Viewed by 2454
Abstract
Dislocation interactions with twin boundary (TB) have been well-established in nanotwinned metals. Penta-twins, as an extreme of crystal twinning, are tacitly assumed to be more effective at blocking dislocation motions than conventional single or coplanar nanotwins. However, the mechanism underlying the interactions between [...] Read more.
Dislocation interactions with twin boundary (TB) have been well-established in nanotwinned metals. Penta-twins, as an extreme of crystal twinning, are tacitly assumed to be more effective at blocking dislocation motions than conventional single or coplanar nanotwins. However, the mechanism underlying the interactions between dislocations and penta-twins remains largely unclear. Here, by combining in situ transmission electron microscope (TEM) nanomechanical testing and atomistic simulations, we rationalize the fundamental interactions between dislocations and penta-twins in Au nanocrystals. Our results reveal that the interactions between dislocations and penta-twins show some similar behaviors to the ones in the cases of coplanar nanotwins, including dislocation impedance at TBs, cross-slip into the twinning plane and transmission across the TB. In addition, penta-twins also exhibit some unique behaviors during dislocation interactions, including multiple cross-slip, dislocation-induced core dissociation and climb-induced annihilation/absorption at the penta-twin core. These findings enhance our mechanistic understanding of dislocation behaviors in penta-twins, shedding light on the accessible design of high-performance nanomaterials with multi-twinned nanostructures. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Nanoscale Metallic Materials)
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11 pages, 8604 KiB  
Article
Deformation Mechanisms of FCC-Structured Metallic Nanocrystal with Incoherent Twin Boundary
by Yang Tao, Yufeng Zhao, Zhanxin Wang, Libo Fu and Lihua Wang
Metals 2021, 11(11), 1672; https://doi.org/10.3390/met11111672 - 20 Oct 2021
Cited by 3 | Viewed by 2393
Abstract
Incoherent twin boundaries (ITBs) can significantly affect the mechanical properties of twin-structured metals. However, most previous studies have focused on the deformation mechanism of the coherent twin boundary (CTB), and metals with ITB-accommodated plasticity still require further investigation. In this study, deformation mechanisms [...] Read more.
Incoherent twin boundaries (ITBs) can significantly affect the mechanical properties of twin-structured metals. However, most previous studies have focused on the deformation mechanism of the coherent twin boundary (CTB), and metals with ITB-accommodated plasticity still require further investigation. In this study, deformation mechanisms of FCC-structured nanocrystal metals with ITBs were investigated using molecular dynamic (MD) simulations. We revealed that three deformation mechanisms occur in metals with ITBs. The first type of deformation was observed in Au, where the plasticity is governed by partial dislocation intersections with CTBs or reactions with each other to form Lomer–Cottrell (L–C) locks. In the second type, found in Al, the deformation is governed by reversible ITB migration. The third type of deformation, in Ni and Cu, is governed by partial dislocations emitted from the ITB or the tips of the stacking faults (SFs). The observed L–C lock formation, as well as the reversible ITB migration and partial dislocation emission from the tips of SFs, have rarely been reported before. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Nanoscale Metallic Materials)
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