Special Issue "Crystal Dislocations: Their Impact on Physical Properties of Crystals"

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystal Engineering".

Deadline for manuscript submissions: 31 October 2017

Special Issue Editor

Guest Editor
Prof. Dr. Peter Lagerlof

Case Western Reserve University, Department of Materials Science and Engineering, USA
Website | E-Mail
Interests: slip and twinning in ceramics and metals; X-ray diffraction; electron microscopy; microstructural development; mechanical properties

Special Issue Information

Dear Colleagues,

The proposed existance of the edge and screw dislcoation, in the 1930s, and the subsequent work showing that dislocation theory could explain the plastic deformation of crystals, represent an important step in developing our understanding of materials into a science. The continued work involved with characterization of dislocations, and linking them to a variety of physical properties, in both single and poly crystals, have made enormous progress over the past 50 years. It is rare to find a technical application involving a material with any crystal structure that is not impacted by dislocations; mechanical properties, massive phase transformations, interphases, crystal growth, electronic properties, and the list goes on. In many systems, the properties are controlled by the formation of partial dislocations separated by a stacking fault; for example, plastic deformation via deformation twinning. Finally, giant strides have been made in characterization and modeling of systems containing dislcocations.

The Special Issue on “Crystal Dislocations” is intended to provide a unique international forum aimed at covering a broad range of results involving dislocations and their importance in crystal properties and crystal growth. Scientists working in a wide range of disciplines are invited to contribute to this cause.

The list of key words shown below cover only a limited range of areas in which dislocations play an intrical part; this Special Issue of Crystals is open for any innovative contributions involving dislocations.

Prof. Dr. K. Peter D. Lagerlof
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. 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 1000 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

  • Crystal dislocations
  • Partial dislocations
  • Crystal defect structures and properties
  • Deformation twinning
  • Massive phase transformations
  • Characterization of dislocations
  • Crystal growth

Published Papers (1 paper)

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Research

Open AccessArticle Phase Transformation and Hydrogen Storage Properties of an La7.0Mg75.5Ni17.5 Hydrogen Storage Alloy
Crystals 2017, 7(10), 316; doi:10.3390/cryst7100316
Received: 25 September 2017 / Revised: 9 October 2017 / Accepted: 16 October 2017 / Published: 18 October 2017
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Abstract
X-ray diffraction showed that an La7.0Mg75.5Ni17.5 alloy prepared via inductive melting was composed of an La2Mg17 phase, an LaMg2Ni phase, and an Mg2Ni phase. After the first hydrogen absorption/desorption process, the
[...] Read more.
X-ray diffraction showed that an La7.0Mg75.5Ni17.5 alloy prepared via inductive melting was composed of an La2Mg17 phase, an LaMg2Ni phase, and an Mg2Ni phase. After the first hydrogen absorption/desorption process, the phases of the alloy turned into an La–H phase, an Mg phase, and an Mg2Ni phase. The enthalpy and entropy derived from the van’t Hoff equation for hydriding were −42.30 kJ·mol−1 and −69.76 J·K−1·mol−1, respectively. The hydride formed in the absorption step was less stable than MgH2 (−74.50 kJ·mol−1 and −132.3 J·K−1·mol−1) and Mg2NiH4 (−64.50 kJ·mol−1 and −123.1 J·K−1·mol−1). Differential thermal analysis showed that the initial hydrogen desorption temperature of its hydride was 531 K. Compared to Mg and Mg2Ni, La7.0Mg75.5Ni17.5 is a promising hydrogen storage material that demonstrates fast adsorption/desorption kinetics as a result of the formation of an La–H compound and the synergetic effect of multiphase. Full article
(This article belongs to the Special Issue Crystal Dislocations: Their Impact on Physical Properties of Crystals)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Study on the interaction between a dislocation and point defects in alkali halide crystals by the strain-rate cycling test during the Blaha effect

Y. Kohzuki and T. Ohgaku 

Department of Mechanical Engineering, Saitama Institute of Technology, 1690 Fusaiji, Fukaya, Saitama 369-0293, Japan 

The interaction between a dislocation and point defects has been investigated by measurements of yield stress and proof stress, microhardness test, direct observation of the dislocation, internal friction measurement, or stress relaxation test so far. A large number of investigations have been carried out by separation of the flow stress into effective and internal stresses on the basis of the temperature dependence of yield stress, the strain rate dependence of flow stress, and the stress relaxation. Nevertheless, it is difficult to investigate the interaction between a dislocation and obstacles during plastic deformation by the mentioned methods. As for combination method of strain-rate cycling tests and the Blaha effect measurement, the original method is different from above-mentioned ones and would be possible to clear up it. The strain-rate cycling test during the Blaha effect measurement has been successively provided the information on the dislocation motion breaking away from not only dopant ions but also X-irradiation induced defects with the ultrasonic oscillatory stress, and further seemed to separate the contributions arising from the interaction between dislocation and the point defects and those from dislocations themselves during plastic deformation of ionic crystals. Such information on dislocation motion in bulk material cannot be obtained by the widely known methods so far.

 

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