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Crystals
Special Issues
Strain Reversal in Metals and Alloys: Origins and Consequences
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Strain Reversal in Metals and Alloys: Origins and Consequences

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (31 March 2021) | Viewed by 5307

Special Issue Editors

Dr. Ebad Bagherpour

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Guest Editor
Brunel Centre for Advanced Solidification Technology, Brunel University London, Uxbridge, Middlesex UB8 3PH, UK
Interests: mechanics of materials; severe plastic deformation (SPD); modelling and simulation; microstructure–properties relationship
Special Issues, Collections and Topics in MDPI journals
Assoc. Prof. Dr. Mohsen Reihanian

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Guest Editor
Shahid Chamran University of Ahvaz, Iran
Interests: severe plastic deformation; metal matrix composites; deformation behavior; materials characterization
Prof. Dr. Ramin Ebrahimi

E-Mail
Guest Editor
Shiraz University, Iran
Interests: mechanics of materials; metal forming; severe plastic deformation; thermomechanical processing

Special Issue Information

Dear Colleagues,

The effects of changing the strain path on the properties of metals and alloys are undeniable. Unexpected changes in the grain size, dislocation density, structure of grain boundaries, and dominant crystallographic texture are vital microstructural features as consequences of strain reversal. These microstructural changes lead to unique mechanical properties such as enhanced ductility, flow stress saturation, and softening during plastic deformation. Strain reversal occurs during various deformation paths, including compression–tension, torsion, bending, shear, and redundant strain.

This Special Issue is dedicated to covering all aspects of strain reversal, from its origins to its consequences in the deformation behavior and properties of metals and alloys. The potential topics include, but are not limited to:

  • Impacts of strain reversal on mechanical properties and microstructure (from nano to micron size), dislocation arrangement, grain size, and texture.
  • Factors affecting strain reversal, including the process parameters (e.g., the amount of forward and reverse strain) and the parameters relevant to the material, including the initial grain size, stacking fault, strain path, elasticity (in fatigue), and grain refinement.
  • Processes involving strain reversal, from fatigue to severe plastic deformation methods including equal channel angular extrusion, simple shear extrusion, twist extrusion, high-pressure torsion, cyclic expansion extrusion, and accumulative roll bonding.

Both experimental and computational works (modelling and simulation) on metals and their alloys relevant to any aspects of strain reversal are welcome.

Dr. Ebad Bagherpour
Assoc. Prof. Dr. Mohsen Reihanian
Prof. Dr. Ramin Ebrahimi
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. Crystals 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

  • strain reversal
  • fatigue
  • severe plastic deformation
  • compression–tension
  • torsion
  • bending
  • strain path
  • Bauschinger effect

Published Papers (2 papers)

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Research

12 pages, 1748 KiB  
Article
Formation of Interstitial Dislocation Loops by Irradiation in Alpha-Iron under Strain: A Molecular Dynamics Study
by Mohammad Bany Salman, Mehmet Emin Kilic and Mosab Jaser Banisalman
Crystals 2021, 11(3), 317; https://doi.org/10.3390/cryst11030317 - 23 Mar 2021
Cited by 4 | Viewed by 2248
Abstract
The present work reports the formation of an interstitial dislocation loop with a lower primary knock-on atom (PKA) energy in alpha-iron under strain conditions by the use of molecular dynamics simulation. The study was conducted using a PKA energy of 1~10 keV and [...] Read more.
The present work reports the formation of an interstitial dislocation loop with a lower primary knock-on atom (PKA) energy in alpha-iron under strain conditions by the use of molecular dynamics simulation. The study was conducted using a PKA energy of 1~10 keV and hydro-static strain from −1.4 to 1.6%. The application of 1.6% hydrostatic strain results in the formation of ½<111> dislocation loop with a low PKA of 3 keV. This result was associated with a threshold displacement energy decrement when moving from compression to tension strain, which resulted in more Frenkel pairs initiated at peak time. Furthermore, many of the initiated defects were energetically favorable by 2 eV in the form of the interstitial dislocation loop rather than a mono defect. Full article
(This article belongs to the Special Issue Strain Reversal in Metals and Alloys: Origins and Consequences)
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15 pages, 3063 KiB  
Article
Role of Strain Reversal in Microstructure and Texture of Pure Al during Non-Monotonic Simple Shear Straining
by Ebad Bagherpour, Mohsen Reihanian, Ramin Ebrahimi, Fathallah Qods and Hiroyuki Miyamoto
Crystals 2020, 10(10), 926; https://doi.org/10.3390/cryst10100926 - 12 Oct 2020
Cited by 2 | Viewed by 2412
Abstract
The effect of reverse straining on the microstructure, texture, and hardness of the pure Al during the single cycle of the simple shear extrusion (SSE) process is investigated. Electron backscattering diffraction (EBSD), transmission electron microscopy (TEM), and scanning transmission electron microscopy (STEM) are [...] Read more.
The effect of reverse straining on the microstructure, texture, and hardness of the pure Al during the single cycle of the simple shear extrusion (SSE) process is investigated. Electron backscattering diffraction (EBSD), transmission electron microscopy (TEM), and scanning transmission electron microscopy (STEM) are used for microstructural evaluations. Due to the nature of the SSE process, the direction of the shear is reversed in the second half channel. As a result, the mean misorientation angle, dislocation density, and hardness decrease. The grain size increases to some extent in the exit of the channel compared with that in the middle. The structural evolution during the single pass of SSE is described in terms of the dislocation cancelling, “untangling” of the cell walls and disintegration of the “forward” cell structure due to the reverse straining in the second half channel. Some simple shear components replace the first texture component in the middle of the channel. At the exit of the channel, the primary texture components appear somewhat confirming the strain reversal effect in the second half channel. Full article
(This article belongs to the Special Issue Strain Reversal in Metals and Alloys: Origins and Consequences)
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