Metals under High Pressure

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Casting, Forming and Heat Treatment".

Deadline for manuscript submissions: closed (30 April 2021) | Viewed by 2398

Special Issue Editor


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Guest Editor
Department of Engineering, and Geodynamics Research Center, Ehime University, 3-Bunkyocho, Matsuyama, Ehime 790-8577, Japan
Interests: high pressure; mechanical behavior; magnetism; crystal structure; microstructure; iron; magnesium; deformation

Special Issue Information

Dear Colleagues,

The relationship between pressure and the physical properties of metals has received attention from various scientific fields. A change in the interatomic distance due to the pressure field causes electrical, magnetic, and crystal structural phase transitions. These findings advance the physical understanding of various phenomena. The high-pressure field is a useful tool for the development of new materials as it does not form ambient pressure processing. High pressure fields not only create high density phases but also enable the mixing of elements that cannot be mixed at ambient pressure. Low diffusion coefficients obtained by high-pressure fields are suitable for producing fine polycrystalline materials. The material properties obtained by high-pressure processing enable demonstrate the potential of the materials to advance materials design.

This Special Issue will cover a wide range of articles, describing materials research related to high-pressure fields, involving experimental, theoretical, and computational work. High-pressure refers not only to the static pressure level, but also to shock wave or high strain field conditions. Target materials are defined as all materials that include elemental metals and compounds or alloys. Articles and Reviews for experimental research should contain results based on one of the following methods: in-situ high-pressure experiments, high-pressure synthesis, high-pressure treatments, and shock wave. Investigations on all aspects of materials properties and structures are welcome.

Prof. Dr. Masafumi Matsushita
Guest Editor

Manuscript Submission Information

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Keywords

  • High pressure
  • Shock
  • Compound
  • Alloy
  • Mechanical properties
  • Electrical properties
  • Magnetic properties
  • Crystal structure
  • Microstructure

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Published Papers (1 paper)

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Research

10 pages, 4368 KiB  
Article
Formation Process of Long-Period Stacking-Ordered Structures in Mg97Zn1Y2 Alloy Comprising HCP and Cubic Phases Fabricated by High-Pressure High-Temperature Annealing
by Atsuki Yokota, Masafumi Matsushita, Naruhito Geshi, Daiki Yamasaki, Toru Shinmei, Michiaki Yamasaki and Yoshihito Kawamura
Metals 2021, 11(7), 1031; https://doi.org/10.3390/met11071031 - 26 Jun 2021
Cited by 3 | Viewed by 1893
Abstract
As-cast Mg97Zn1Y2 alloy consists of α-Mg matrix and 18R-type long-period stacking-ordered (LPSO) structures. We observed that the alloy undergoes a phase transformation to D03 superlattices and α-Mg matrix due to high-pressure high-temperature (HPHT) annealing at 3 GPa [...] Read more.
As-cast Mg97Zn1Y2 alloy consists of α-Mg matrix and 18R-type long-period stacking-ordered (LPSO) structures. We observed that the alloy undergoes a phase transformation to D03 superlattices and α-Mg matrix due to high-pressure high-temperature (HPHT) annealing at 3 GPa and above 773 K. Further, the alloy recovered after HPHT annealing, consisting of the α-Mg matrix and D03 superlattices, transformed into 18R-type LPSO structures during further annealing at ambient pressure. An fcc structure with a lattice parameter of 1.42 nm, which was twice that of D03, emerged in both the collapse process of the 18R-type LPSO structure under high-pressure, and the formation process of the 18R-type LPSO structure at ambient pressure. This fcc phase was an intermediate structure between 18R-type LPSO and D03. From the electron diffraction results, it is considered that 18R-type LPSO is continuously present with 2H including stacking faults, which almost corresponded with previous studies. Full article
(This article belongs to the Special Issue Metals under High Pressure)
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