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Metals
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Deformation Dynamics of Heterogeneous Metallic Materials
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Deformation Dynamics of Heterogeneous Metallic Materials

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Failure Analysis".

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 4714

Special Issue Editors

Prof. Dr. Junyu Huang

E-Mail Website
Guest Editor
The Peac Institute of Multiscale Sciences, Chengdu 610299, China
Interests: impact dynamics; granular and foam materials; X-ray imaging; X-ray tomography; finite element modeling
Prof. Dr. Yangguang Xu

E-Mail Website
Guest Editor
Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu 611756, China
Interests: experimental mechanics; shape memory alloy; microstructural characterization
Prof. Dr. Feng Zhao

E-Mail Website
Guest Editor
Institute for Advanced Materials Deformation and Damage from Multi-Scale, Chengdu University, Chengdu 610106, China
Interests: magnesium alloy; dynamic plastic deformation; impact dynamics; microstructural characterization
Prof. Dr. Jin-Feng Li

E-Mail Website
Guest Editor
Institute of Materials, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China
Interests: mechanical properties; high-entropy alloys; additive manufacturing; materials science and engineering

Special Issue Information

Dear Colleagues,

Heterogeneous metallic materials (nanotwinned, bimodal, harmonic, lamellar, gradient, nano/micro-porous, composite, etc.) are an emerging class of materials which generally exhibit superior mechanical properties to those of their homogeneous counterparts, such as considerable strength–ductility synergy, enhanced fatigue and fracture resistance, etc. The mechanical responses of heterogeneous metallic materials depend strongly on their microstructure-dominated deformation mechanisms, based on dislocation interaction with intrinsic microstructures like grain/twin boundaries, phase interfaces, etc. The deformation dynamics (e.g., dislocation motion, twinning, phase transition) of heterogeneous materials is significant to understanding their structure–property relationship, but presents an experimental challenge to both materials science and mechanics communities.

This Special Issue aims to publish research works that help to understand the relationships among the microstructure, deformation mechanism and mechanical response of metallic materials with heterogeneous microstructures. We anticipate that this Special Issue will build a bridge between materials science and mechanics communities. We welcome the submission of research papers dealing with topics including but not limited to the following: advanced fabrication (e.g., additive manufacturing), mechanical testing (e.g., dynamic compression/tension/shear, planar impact, ballistic penetration), microstructural characterization (e.g., scanning/transmission electron microscopy, X-ray/neutron imaging/tomography/diffraction), and multiscale modeling (e.g., ab initio method, molecular dynamics, Monte Carlo method, phase-field modeling, finite element method). Cutting-edge experiments with various in situ characterizations are of particular interest.

Prof. Dr. Junyu Huang
Prof. Dr. Yangguang Xu
Prof. Dr. Feng Zhao
Prof. Dr. Jin-Feng Li
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

  • heterogeneous metallic materials
  • fabrication
  • mechanical testing
  • microstructural characterization
  • multiscale modeling

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (3 papers)

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Research

14 pages, 14402 KiB  
Article
Mechanical Response of CNT/2024Al Composite to Compression and Tension at Different Strain Rates
by Jiajie Xiang, Yuxuan Zheng, Jiang Li and Zhanqiu Tan
Metals 2023, 13(2), 254; https://doi.org/10.3390/met13020254 - 28 Jan 2023
Cited by 1 | Viewed by 1333
Abstract
Compressive and tensile properties of a carbon nanotube (CNT) reinforced 2024Al composite are investigated under quasi-static and dynamic compression as well as quasi-static tension, along three different directions (extrusion, normal and transverse directions). Upon compression, yield and fracture strengths of the composite show [...] Read more.
Compressive and tensile properties of a carbon nanotube (CNT) reinforced 2024Al composite are investigated under quasi-static and dynamic compression as well as quasi-static tension, along three different directions (extrusion, normal and transverse directions). Upon compression, yield and fracture strengths of the composite show negligible strain rate effect and mechanical anisotropy as manifested in the compressive stress–strain curves. Fractography and profilometry show that fracture surfaces are rough shear fracture planes for quasi-static compression; however, smooth conical fracture surfaces are observed for dynamic compression as a result of more homogeneous damage nucleation and growth, leading to high ductility under high strain rate loading. Pronounced mechanical anisotropy is observed for the composite under quasi-static tensile loading. Ductility or fracture strain is the highest along the normal direction, because debonding along the particle and lamellar interfaces is suppressed along this direction. In situ optical imaging along with digital image correlation is utilized to obtain the deformation dynamics of the composite along the three different directions. Stripe-shaped strain localizations appear in the strain fields along the extruded and tangential directions, while the strain fields are approximately uniformly distributed along the normal direction, consistent with the stress–strain curves. Full article
(This article belongs to the Special Issue Deformation Dynamics of Heterogeneous Metallic Materials)
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12 pages, 3850 KiB  
Article
Investigation of Medium Range Order Defects in CuxZr100-x (x = 50, 56, 60, 64) Metallic Glasses Using Reverse Monte Carlo Modeling
by Yuan Liu, Shiwei Hu, Jingrun Luo, Hao Hu and Xin Huang
Metals 2023, 13(1), 70; https://doi.org/10.3390/met13010070 - 27 Dec 2022
Cited by 3 | Viewed by 1379
Abstract
The identification of glassy defects in amorphous materials is a long-standing but imperative problem which hinders our deep understanding of the structural origin of mechanical behavior in metallic glasses (MGs). Here, a combination of experiments and numerical simulations were used to reconstruct the [...] Read more.
The identification of glassy defects in amorphous materials is a long-standing but imperative problem which hinders our deep understanding of the structural origin of mechanical behavior in metallic glasses (MGs). Here, a combination of experiments and numerical simulations were used to reconstruct the atomic packing of MGs. Using the integration of synchrotron X-ray diffraction (XRD) datasets, ab initio molecular dynamics simulations, as well as reverse Monte Carlo simulation, we determined the three-dimensional atomic positions of a series of binary MGs CuxZr100-x (x = 50, 56, 60, 64). Then we uncovered the connection of short-range clusters as well as the nature of the medium range order (MRO). It turns out that full icosahedral tend to connect to each other forming the back bones, with dimensions positively correlated with the Cu content. By quantifying the discontinuity of full icosahedral networks, we identified the MRO defects which were found to be highly influenced by the macroscopic chemical contents. Here, the density of MRO defects is growing with the decrease of Cu contents. These results suggest the reason for the stable kinetic properties and good glass forming ability of the Cu64Zr36 system, which is rich in full icosahedral clusters <0,0,12,0> but a lack of MRO defects. Full article
(This article belongs to the Special Issue Deformation Dynamics of Heterogeneous Metallic Materials)
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8 pages, 1739 KiB  
Article
A Solution to the Hot Cracking Problem and Anisotropic Mechanical Properties for Directed Energy Deposition FeCoNiCr Multi-Principal-Element Alloy
by Liufei Huang, Rui Li, Yaoning Sun, Denggao Guan, Chuanhui Liang, Chunli Jiang, Jun Chen, Dou Wang and Jinfeng Li
Metals 2022, 12(10), 1581; https://doi.org/10.3390/met12101581 - 23 Sep 2022
Cited by 1 | Viewed by 1390
Abstract
In this paper, a laser-based directed energy deposition (DED) technique is used to fabricate FeCoNiCr and CrMnFeCoNi multi-principal-element alloys (MPEAs). Comparing the above samples, the FeCoNiCr samples with coarse columnar grains cracked, while the CrMnFeCoNi samples with equiaxed grain were crack-free. The strategy [...] Read more.
In this paper, a laser-based directed energy deposition (DED) technique is used to fabricate FeCoNiCr and CrMnFeCoNi multi-principal-element alloys (MPEAs). Comparing the above samples, the FeCoNiCr samples with coarse columnar grains cracked, while the CrMnFeCoNi samples with equiaxed grain were crack-free. The strategy that removes cracks is to induce a columnar-grain-to-equiaxed-grain transition (CET) with Mn addition to offer more grain boundaries to withstand residual stress in the process of DED-fabricated FeCoNiCr and to help minimize hot cracking. Furthermore, the yield strength, tensile strength, and tensile ductility of the DED-fabricated CrMnFeCoNi obviously improved compared with the DED-fabricated CoCrFeNi and exhibited better isotropic mechanical properties. The present work provides a novel strategy to utilize CET for resisting crack propagation in the process DED-fabricated MPEAs and improvement in mechanical properties of MPEAs. Full article
(This article belongs to the Special Issue Deformation Dynamics of Heterogeneous Metallic Materials)
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