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Metals
Special Issues
Serration and Noise Behavior in Advanced Materials
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Serration and Noise Behavior in Advanced Materials

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (31 May 2015) | Viewed by 18887

Special Issue Editors

Prof. Peter K. Liaw

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Guest Editor
Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996-2100, USA
Interests: mechanical behavior; fatigue and fracture behavior; nondestructive evaluation; neutron/synchrotron studies of advanced materials, including bulk metallic glasses; nanostructural materials; high-entropy alloys; superalloys; steels; intermetallics
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Yong Yang

E-Mail Website
Guest Editor
Department of Mechanical Engineering, City University of Hong Kong, Kowloon Tong, Kowloon, Hong Kong 999077, China
Interests: metallic glasses; high entropy alloys; fatigue and fracture; flexible electronics and structural biomaterials
Prof. Dr. Yong Zhang

E-Mail Website
Guest Editor
Beijing Advanced Innovation Center of Materials Genome Engineering, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, 30 Xueyuan Road, Beijing 100083, China
Interests: high entropy and amorphous alloys; serration and noise in materials; metamaterials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

“Noise” is everywhere in our daily life, such as the crackling noise arising from paper crumpling and fault movement during earthquakes. In materials science, the phenomenon of noise is also ubiquitous, particularly, in the study of the deformation behavior of materials, which usually manifests as serrated plastic flows. Over the past few years, this interesting and universal phenomenon has attracted tremendous research interest, which can be observed among a wide range of advanced materials, from granular matters, single-crystalline metals, AlMg alloys, low carbon and TWIP steels, shape memory alloys, high entropy alloys to metallic glasses. To provide a physical understanding of universal noise behavior, different elastic coupling models have been proposed, with a variety of scaling relations being predicted. However, the source of noise when these advanced materials are deformed is still being debated. To materials scientists, understanding the structural origin of the noise may help avoid catastrophic failure and therefore inform the design of plasticity in these advanced materials. In this Special Issue, we intend to provide comprehensive studies related to the serration and noise behavior of various advanced materials. Topics include theoretical modeling, experimental characterization, and numerical simulations.

Prof. Dr. Peter K. Liaw
Prof. Dr. Yong Zhang
Dr. Yong Yang
Guest Editors

Manuscript Submission Information

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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

  • plastic deformation and serration behavior
  • high entropy and amorphous alloys
  • shape memory alloys and TWIP steel
  • Barkhausen Noise
  • structural units for plastic deformation
  • PLC serrations in AlMg alloys and low carbon steels

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Published Papers (3 papers)

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Research

1902 KiB  
Article
Relaxation Mechanisms, Structure and Properties of Semi-Coherent Interfaces
by Shuai Shao and Jian Wang
Metals 2015, 5(4), 1887-1901; https://doi.org/10.3390/met5041887 - 15 Oct 2015
Cited by 10 | Viewed by 5970
Abstract
In this work, using the Cu–Ni (111) semi-coherent interface as a model system, we combine atomistic simulations and defect theory to reveal the relaxation mechanisms, structure, and properties of semi-coherent interfaces. By calculating the generalized stacking fault energy (GSFE) profile of the interface, [...] Read more.
In this work, using the Cu–Ni (111) semi-coherent interface as a model system, we combine atomistic simulations and defect theory to reveal the relaxation mechanisms, structure, and properties of semi-coherent interfaces. By calculating the generalized stacking fault energy (GSFE) profile of the interface, two stable structures and a high-energy structure are located. During the relaxation, the regions that possess the stable structures expand and develop into coherent regions; the regions with high-energy structure shrink into the intersection of misfit dislocations (nodes). This process reduces the interface excess potential energy but increases the core energy of the misfit dislocations and nodes. The core width is dependent on the GSFE of the interface. The high-energy structure relaxes by relative rotation and dilatation between the crystals. The relative rotation is responsible for the spiral pattern at nodes. The relative dilatation is responsible for the creation of free volume at nodes, which facilitates the nodes’ structural transformation. Several node structures have been observed and analyzed. The various structures have significant impact on the plastic deformation in terms of lattice dislocation nucleation, as well as the point defect formation energies. Full article
(This article belongs to the Special Issue Serration and Noise Behavior in Advanced Materials)
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1860 KiB  
Article
A Computationally-Efficient Numerical Model to Characterize the Noise Behavior of Metal-Framed Walls
by Arun Arjunan, Chang Wang, Martin English, Mark Stanford and Paul Lister
Metals 2015, 5(3), 1414-1431; https://doi.org/10.3390/met5031414 - 7 Aug 2015
Cited by 27 | Viewed by 5564
Abstract
Architects, designers, and engineers are making great efforts to design acoustically-efficient metal-framed walls, minimizing acoustic bridging. Therefore, efficient simulation models to predict the acoustic insulation complying with ISO 10140 are needed at a design stage. In order to achieve this, a numerical model [...] Read more.
Architects, designers, and engineers are making great efforts to design acoustically-efficient metal-framed walls, minimizing acoustic bridging. Therefore, efficient simulation models to predict the acoustic insulation complying with ISO 10140 are needed at a design stage. In order to achieve this, a numerical model consisting of two fluid-filled reverberation chambers, partitioned using a metal-framed wall, is to be simulated at one-third-octaves. This produces a large simulation model consisting of several millions of nodes and elements. Therefore, efficient meshing procedures are necessary to obtain better solution times and to effectively utilise computational resources. Such models should also demonstrate effective Fluid-Structure Interaction (FSI) along with acoustic-fluid coupling to simulate a realistic scenario. In this contribution, the development of a finite element frequency-dependent mesh model that can characterize the sound insulation of metal-framed walls is presented. Preliminary results on the application of the proposed model to study the geometric contribution of stud frames on the overall acoustic performance of metal-framed walls are also presented. It is considered that the presented numerical model can be used to effectively visualize the noise behaviour of advanced materials and multi-material structures. Full article
(This article belongs to the Special Issue Serration and Noise Behavior in Advanced Materials)
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462 KiB  
Article
The Self-Organized Critical Behavior in Pd-based Bulk Metallic Glass
by Zhong Wang, Jiaojiao Li, Wei Zhang, Junwei Qiao and Baocheng Wang
Metals 2015, 5(3), 1188-1196; https://doi.org/10.3390/met5031188 - 6 Jul 2015
Cited by 4 | Viewed by 6290
Abstract
Bulk metallic glasses (BMGs) deform irreversibly through shear banding manifested as serrated-flow behavior during compressive tests. The strain-rate-dependent plasticity under uniaxial compression at the strain rates of 2 × 10−2, 2 × 10−3, and 2 × 10−4·s [...] Read more.
Bulk metallic glasses (BMGs) deform irreversibly through shear banding manifested as serrated-flow behavior during compressive tests. The strain-rate-dependent plasticity under uniaxial compression at the strain rates of 2 × 10−2, 2 × 10−3, and 2 × 10−4·s−1 in a Pd-based BMG is investigated. The serrated flow behavior is not observed in the stress-strain curve at the strain rate of 2 × 10−2·s−1. However, the medial state occurs at the strain rates of 2 × 10−3·s−1, and eventually the self-organized critical (SOC) behavior appears at the strain rate of 2 × 10−4·s−1. The distribution of the elastic energy density shows a power-law distribution with the power-law exponent of −2.76, suggesting that the SOC behavior appears. In addition, the cumulative probability is well approximated by a power-law distribution function with the power-law exponent of 0.22 at the strain rate of 2 × 10−4·s−1. The values of the goodness of fit are 0.95 and 0.99 at the strain rates of 2 × 10−3 and 2 × 10−4·s−1, respectively. The transition of the dynamic serrated flows of BMGs is from non-serrated flow to an intermediate state and finally to the SOC state with decreasing the strain rates. Full article
(This article belongs to the Special Issue Serration and Noise Behavior in Advanced Materials)
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