Special Issue "Processing and Properties of Bulk Nanostructured Materials"

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

Deadline for manuscript submissions: closed (30 September 2011)

Special Issue Editors

Guest Editor
Dr. Heinz Werner Höppel

Department of Materials Science and Engineering Institute I Universität Erlangen-Nürnberg Martensstrasse 5 91058 Erlangen, Germany
Website | E-Mail
Interests: fatigue mechanisms of metallic materials; mechanical properties and their correlation to microstrcuture; in-situ deformation
Guest Editor
Prof. Dr. Alexander Hartmaier

Interdisciplinary Centre for Advanced Materials Simulation (ICAMS), Ruhr-Universität Bochum, Stiepeler Str. 129, 44801 Bochum, Germany
Website | E-Mail
Phone: +49 234 32-29314
Fax: +49 234 32 14984
Interests: Micromechanical simulation; Prediction of macroscopic materials behaviour; Dislocation dynamics; Large-scale atomistic simulation

Special Issue Information

Dear Colleagues,

The special issue focuses on the processing of metallic materials by methods of severe plastic deformation (SPD) in order to obtain ultrafine-grained (UFG) microstructures. On the one hand side, emphasis is laid on new developments in severe plastic deformation techniques, including new processing methods, advances in modeling and simulation of the severe plastic deformation processes, prediction of the microstructural evolution during SPD-processing and industrial up-scaling strategies. On the other hand side, the correlation between SPD-processing parameters, the microstructure and the resulting materials properties paired with new approaches in modeling and simulation of UFG-materials behaviour are in focus of this issue. It will cover the interaction between the obtained microstructure and the mechanical properties in UFG materials, strategies to enhance the microstructural stability, new developments of tailoring/grading and functionalization of materials by SPD-processing as well as principal investigations on the deformation mechanisms in UFG materials related to SPD-processing.

Prof. Dr. Alexander Hartmaier
Dr. Heinz W. Höppel
Guest Editors

Keywords

  • Bulk Nanostructured Materials
  • Severe Plastic Deformation
  • Ultrafine-grained / nanocrystalline materials
  • (Mechanical) properties and microstructure
  • Modeling and Simulation
  • Up-scaling of SPD- processes

Published Papers (4 papers)

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Research

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Open AccessArticle Martensitic Transformation in Ultrafine-Grained Stainless Steel AISI 304L Under Monotonic and Cyclic Loading
Metals 2012, 2(1), 56-64; doi:10.3390/met2010056
Received: 4 December 2011 / Revised: 22 December 2011 / Accepted: 13 January 2012 / Published: 2 February 2012
Cited by 1 | PDF Full-text (708 KB) | HTML Full-text | XML Full-text
Abstract
The monotonic and cyclic deformation behavior of ultrafine-grained metastable austenitic steel AISI 304L, produced by severe plastic deformation, was investigated. Under monotonic loading, the martensitic phase transformation in the ultrafine-grained state is strongly favored. Under cyclic loading, the martensitic transformation behavior is similar
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The monotonic and cyclic deformation behavior of ultrafine-grained metastable austenitic steel AISI 304L, produced by severe plastic deformation, was investigated. Under monotonic loading, the martensitic phase transformation in the ultrafine-grained state is strongly favored. Under cyclic loading, the martensitic transformation behavior is similar to the coarse-grained condition, but the cyclic stress response is three times larger for the ultrafine-grained condition. Full article
(This article belongs to the Special Issue Processing and Properties of Bulk Nanostructured Materials)
Open AccessArticle Particle Based Alloying by Accumulative Roll Bonding in the System Al-Cu
Metals 2011, 1(1), 65-78; doi:10.3390/met1010065
Received: 29 September 2011 / Revised: 11 October 2011 / Accepted: 31 October 2011 / Published: 7 November 2011
Cited by 13 | PDF Full-text (2030 KB) | HTML Full-text | XML Full-text
Abstract
The formation of alloys by particle reinforcement during accumulative roll bonding (ARB), and subsequent annealing, is introduced on the basis of the binary alloy system Al-Cu, where strength and electrical conductivity are examined in different microstructural states. An ultimate tensile strength (UTS) of
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The formation of alloys by particle reinforcement during accumulative roll bonding (ARB), and subsequent annealing, is introduced on the basis of the binary alloy system Al-Cu, where strength and electrical conductivity are examined in different microstructural states. An ultimate tensile strength (UTS) of 430 MPa for Al with 1.4 vol.% Cu was reached after three ARB cycles, which almost equals UTS of the commercially available Al-Cu alloy AA2017A with a similar copper content. Regarding electrical conductivity, the UFG structure had no significant influence. Alloying of aluminum with copper leads to a linear decrease in conductivity of 0.78 µΩ∙cm/at.% following the Nordheim rule. On the copper-rich side, alloying with aluminum leads to a slight strengthening, but drastically reduces conductivity. A linear decrease of electrical conductivity of 1.19 µΩ∙cm/at.% was obtained. Full article
(This article belongs to the Special Issue Processing and Properties of Bulk Nanostructured Materials)
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Review

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Open AccessReview The Cyclic Deformation Behavior of Severe Plastic Deformation (SPD) Metals and the Influential Factors
Metals 2012, 2(1), 41-55; doi:10.3390/met2010041
Received: 19 November 2011 / Revised: 6 December 2011 / Accepted: 27 January 2012 / Published: 1 February 2012
Cited by 3 | PDF Full-text (321 KB) | HTML Full-text | XML Full-text
Abstract
A deeper understanding of the mechanical behavior of ultra-fine (UF) and nanocrystalline (NC) grained metals is necessary with the growing interest in using UF and NC grained metals for structural applications. The cyclic deformation response and behavior of UF and NC grained metals
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A deeper understanding of the mechanical behavior of ultra-fine (UF) and nanocrystalline (NC) grained metals is necessary with the growing interest in using UF and NC grained metals for structural applications. The cyclic deformation response and behavior of UF and NC grained metals is one aspect that has been gaining momentum as a major research topic for the past ten years. Severe Plastic Deformation (SPD) materials are often in the spotlight for cyclic deformation studies as they are usually in the form of bulk work pieces and have UF and NC grains. Some well known techniques in the category of SPD processing are High Pressure Torsion (HPT), Equal Channel Angular Pressing (ECAP), and Accumulative Roll-Bonding (ARB). In this report, the literature on the cyclic deformation response and behavior of SPDed metals will be reviewed. The cyclic response of such materials is found to range from cyclic hardening to cyclic softening depending on various factors. Specifically, for SPDed UF grained metals, their behavior has often been associated with the observation of grain coarsening during cycling. Consequently, the many factors that affect the cyclic deformation response of SPDed metals can be summarized into three major aspects: (1) the microstructure stability; (2) the limitation of the cyclic lifespan; and lastly (3) the imposed plastic strain amplitude. Full article
(This article belongs to the Special Issue Processing and Properties of Bulk Nanostructured Materials)
Open AccessReview Approaches to Modeling of Recrystallization
Metals 2011, 1(1), 16-48; doi:10.3390/met1010016
Received: 6 September 2011 / Revised: 14 October 2011 / Accepted: 25 October 2011 / Published: 28 October 2011
Cited by 24 | PDF Full-text (495 KB) | HTML Full-text | XML Full-text
Abstract
Control of the material microstructure in terms of the grain size is a key component in tailoring material properties of metals and alloys and in creating functionally graded materials. To exert this control, reliable and efficient modeling and simulation of the recrystallization process
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Control of the material microstructure in terms of the grain size is a key component in tailoring material properties of metals and alloys and in creating functionally graded materials. To exert this control, reliable and efficient modeling and simulation of the recrystallization process whereby the grain size evolves is vital. The present contribution is a review paper, summarizing the current status of various approaches to modeling grain refinement due to recrystallization. The underlying mechanisms of recrystallization are briefly recollected and different simulation methods are discussed. Analytical and empirical models, continuum mechanical models and discrete methods as well as phase field, vertex and level set models of recrystallization will be considered. Such numerical methods have been reviewed previously, but with the present focus on recrystallization modeling and with a rapidly increasing amount of related publications, an updated review is called for. Advantages and disadvantages of the different methods are discussed in terms of applicability, underlying assumptions, physical relevance, implementation issues and computational efficiency. Full article
(This article belongs to the Special Issue Processing and Properties of Bulk Nanostructured Materials)

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