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Special Issue "Dynamic Recrystallization and Microstructural Evolution in Alloys"

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: 30 April 2018

Special Issue Editor

Guest Editor
Prof. Sergey Zherebtsov

Department of Materials Science and Nanotechnology, Belgorod State University, 85 Pobeda street, Belgorod, 308015, Russia
Website | E-Mail
Interests: deformation; grain refinement; phase transformation; titanium alloys; high-entropy alloys; interphase boundaries; grain boundaries; twinning, mechanical properties

Special Issue Information

Dear Colleagues,

The control of the microstructure of metallic materials through thermomechanical processing is one of the main targets of materials science. Microstructure refinement during hot or warm working by the process of dynamic recrystallization is a commonly-employed approach. That is why recrystallization and related annealing phenomena have long been recognized as being both of technological importance and scientific interest. However, although considerable advances have been made recently in the techniques available to the researcher and therefore in the understanding of the processes during deformation, many aspects in the field of deformation-induced microstructure evolution are not well understood.

Lack of understanding is obviously attributed to high complexities of the phenomenon, which consists of a combination of the deformed state of metals and alloys and the processes of local nucleation and grain growth. Qualitative and quantitative characterization of the deformed state and careful description of grain or interphase boundary structure and properties constitute the areas of fundamental importance for the understanding of recrystallization.

Over the past two decades one of the most rapidly developed methods of microstructure refinement was associated with severe plastic deformation. In this case ultrafine grained structures are formed during deformation at relatively low temperatures. This is one of the most promising topics in material science because it could lead to the production of submicron to nanometer sized crystallites in a wide variety of structural metals and alloys. Developments in this area have highlighted the necessary to subdivide recovery, recrystallization and grain growth phenomena into traditional high-temperature ‘discontinuous’ and low-temperature ‘continuous’ variants.

One of the main advantage of a new look at these fields can be associated with the use of modern techniques, such as TEM, EBSD, spectrometers and modeling capabilities which are providing us with far better images and analysis than ever previously possible. These new techniques can be used for investigation not only “traditional” metals and alloys but also for such novel objects as high-entropy alloys or metal-matrix composites.

The purpose of this Special Issue is to collect works related to various manifestations of dynamic recrystallization during hot, warm or cold deformation. It is my pleasure to invite you to submit manuscripts for this Special Issue. Full papers, communications, and reviews are all welcome.

Prof. Sergey Zherebtsov
Guest Editor

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 papers will be 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. Materials 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 1500 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

  • Dynamic  recrystallization
  • Metals,Alloys
  • Deformation
  • Microstructure evolution
  • Grain boundaries, interphases
  • Phase transformation
  • Mechanical behavior

Published Papers (2 papers)

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Research

Open AccessArticle Grain Refinement Kinetics in a Low Alloyed Cu–Cr–Zr Alloy Subjected to Large Strain Deformation
Materials 2017, 10(12), 1394; doi:10.3390/ma10121394
Received: 14 November 2017 / Revised: 29 November 2017 / Accepted: 4 December 2017 / Published: 6 December 2017
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Abstract
This paper investigates the microstructural evolution and grain refinement kinetics of a solution-treated Cu–0.1Cr–0.06Zr alloy during equal channel angular pressing (ECAP) at a temperature of 673 K via route BC. The microstructural change during plastic deformation was accompanied by the formation
[...] Read more.
This paper investigates the microstructural evolution and grain refinement kinetics of a solution-treated Cu–0.1Cr–0.06Zr alloy during equal channel angular pressing (ECAP) at a temperature of 673 K via route BC. The microstructural change during plastic deformation was accompanied by the formation of the microband and an increase in the misorientations of strain-induced subboundaries. We argue that continuous dynamic recrystallization refined the initially coarse grains, and discuss the dynamic recrystallization kinetics in terms of grain/subgrain boundary triple junction evolution. A modified Johnson–Mehl–Avrami–Kolmogorov relationship with a strain exponent of about 1.49 is used to express the strain dependence of the triple junctions of high-angle boundaries. Severe plastic deformation by ECAP led to substantial strengthening of the Cu–0.1Cr–0.06Zr alloy. The yield strength increased from 60 MPa in the initial state to 445 MPa after a total strain level of 12. Full article
(This article belongs to the Special Issue Dynamic Recrystallization and Microstructural Evolution in Alloys)
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Open AccessArticle Development of a Model for Dynamic Recrystallization Consistent with the Second Derivative Criterion
Materials 2017, 10(11), 1259; doi:10.3390/ma10111259
Received: 4 October 2017 / Revised: 26 October 2017 / Accepted: 27 October 2017 / Published: 2 November 2017
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Abstract
Dynamic recrystallization (DRX) processes are widely used in industrial hot working operations, not only to keep the forming forces low but also to control the microstructure and final properties of the workpiece. According to the second derivative criterion (SDC) by Poliak and Jonas,
[...] Read more.
Dynamic recrystallization (DRX) processes are widely used in industrial hot working operations, not only to keep the forming forces low but also to control the microstructure and final properties of the workpiece. According to the second derivative criterion (SDC) by Poliak and Jonas, the onset of DRX can be detected from an inflection point in the strain-hardening rate as a function of flow stress. Various models are available that can predict the evolution of flow stress from incipient plastic flow up to steady-state deformation in the presence of DRX. Some of these models have been implemented into finite element codes and are widely used for the design of metal forming processes, but their consistency with the SDC has not been investigated. This work identifies three sources of inconsistencies that models for DRX may exhibit. For a consistent modeling of the DRX kinetics, a new strain-hardening model for the hardening stages III to IV is proposed and combined with consistent recrystallization kinetics. The model is devised in the Kocks-Mecking space based on characteristic transition in the strain-hardening rate. A linear variation of the transition and inflection points is observed for alloy 800H at all tested temperatures and strain rates. The comparison of experimental and model results shows that the model is able to follow the course of the strain-hardening rate very precisely, such that highly accurate flow stress predictions are obtained. Full article
(This article belongs to the Special Issue Dynamic Recrystallization and Microstructural Evolution in Alloys)
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