Submit to Special Issue Submit Abstract to Special Issue Review for Materials Edit a Special Issue

Journal Browser

► Journal Browser

Special Issue "Structural Phenomena in Metallic Materials for Demanding Applications"

Print Special Issue Flyer
Special Issue Editors
Special Issue Information
Keywords
Published Papers

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Metals and Alloys".

Deadline for manuscript submissions: 20 June 2023 | Viewed by 1691

Share This Special Issue

Special Issue Editor

Dr. Lenka Kunčická

E-Mail Website
Guest Editor

Institut of Physics of Materials, Czech Academy of Sciences, Brno, Czech Republic
Interests: thermo-mechanical treatment; non-ferrous metals; structure and stress analyses; numerical methods
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues and Researchers,

The ever-increasing requirements of industry and commerce on the performance and longevity of components produced from metallic materials have encouraged the research and development of innovative engineering materials based on iron/steel and nonferrous metals, as well as metal-based composites. The properties of modern materials and alloys ensue from their structures. Structural phenomena, such as substructure development, volumes and types of grains boundaries, twinning, texture formation, as well as the possible occurrence of residual stress and mutual diffusion of the individual phases, non-negligibly affecting the performance of metallic components, can primarily be affected by their chemical and phase composition, and the applied preparation/production technology.

At the beginning of the production process, the material is affected by the manufacturing method. The selected parameters of casting, additive manufacturing, or powder metallurgy processing all influence the structures and properties of the final material. Among the favorable ways to effectively enhance the properties of metallic materials is also grain refinement, which can advantageously be introduced via plastic deformation. Nonconventional forming technologies, such as severe plastic deformation (SPD) processes, conventional forming processes in combination with thermomechanical treatments, and optimized heat treatments all represent advantageous means to modify the structures of metallic materials in order to significantly improve their performance. Especially the application of optimized modern processing and forming technologies on alloys and compounds featuring innovative chemical compositions can lead to exceptional structure characteristics, providing the final material with superior performance.

It is my pleasure to invite you to submit your scientific manuscripts to the presented Special Issue. Full papers, communications, and reviews are all welcome.

Dr. Lenka Kunčická
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 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. Materials is an international peer-reviewed open access semimonthly 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 2300 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

(sub)structure characterization
residual stress
texture
grains and boundaries
precipitation
dislocations
lattice parameters
structure phases
diffusion

Published Papers (4 papers)

Download All Papers

Research

Open AccessArticle

High Pressure Torsion of Copper; Effect of Processing Temperature on Structural Features, Microhardness and Electric Conductivity

Lenka Kunčická

Michal Jambor

and

Petr Král

Materials 2023, 16(7), 2738; https://doi.org/10.3390/ma16072738 (registering DOI) - 29 Mar 2023

Viewed by 99

Abstract

By optimizing the fabrication method, copper components featuring (typically contradicting) advantageous electric conductivity and favorable mechanical properties can be acquired. In this study, we subjected conventional electroconductive copper to a single revolution of high pressure torsion (HPT) at room temperature (RT), searched for the conditions which would yield comparable structure characteristics (grain size) when deformed at a cryogenic temperature, and finally compared the mechanical and electric behaviors to assess specific differences and correlate them with the (sub)structural development. 180° revolution of cryo-HPT imparted structure refinement comparable to 360° revolution of room temperature HPT, i.e., the average grain size at the periphery of both the specimens was ~7 µm. The 360° RT HPT specimen exhibited preferential (111)||SD (shear direction) texture fiber in all the examined regions, whereas the 180° cryo-HPT specimen exhibited more or less randomly oriented grains of equiaxed shapes featuring substantial substructure development of a relatively homogeneous character and massive occurrence of (nano)twins. These structural features resulted in the increase in microhardness to the average value of 118.2 HV0.2 and the increase in the electric conductivity to 59.66 MS·m⁻¹ (compared to 105 HV0.2 and 59.14 MS·m⁻¹ acquired for the 360° RT HPT specimen). The deformation under the cryogenic conditions also imparted higher homogeneity of microhardness distribution when compared to RT processing. Full article

(This article belongs to the Special Issue Structural Phenomena in Metallic Materials for Demanding Applications)

► Show Figures

Figure 1

Open AccessArticle

Residual Stress Distribution in a Copper-Aluminum Multifilament Composite Fabricated by Rotary Swaging

and

Materials 2023, 16(5), 2102; https://doi.org/10.3390/ma16052102 - 05 Mar 2023

Viewed by 397

Abstract

Rotary swaging is a promising technique for the fabrication of clad Cu/Al composites. Residual stresses appearing during the processing of a special arrangement of Al filaments within the Cu matrix and the influence of the bar reversal between the passes were studied by (i) neutron diffraction using a novel evaluation procedure for pseudo-strain correction and (ii) a finite element method simulation. The initial study of the stress differences in the Cu phase allowed us to infer that the stresses around the central Al filament are hydrostatic when the sample is reversed during the passes. This fact enabled the calculation of the stress-free reference and, consequently, the analysis of the hydrostatic and deviatoric components. Finally, the stresses with the von Mises relation were calculated. Hydrostatic stresses (far from the filaments) and axial deviatoric stresses are zero or compressive for both reversed and non-reversed samples. The reversal of the bar direction slightly changes the overall state within the region of high density of Al filaments, where hydrostatic stresses tend to be tensile, but it seems to be advantageous for avoiding plastification in the regions without Al wires. The finite element analysis revealed the presence of shear stresses; nevertheless, stresses calculated with the von Mises relation show similar trends in the simulation and in the neutron measurements. Microstresses are suggested as a possible reason for the large width of the neutron diffraction peak in the measurement of the radial direction. Full article

(This article belongs to the Special Issue Structural Phenomena in Metallic Materials for Demanding Applications)

► Show Figures

Figure 1

Open AccessArticle

Dilatation of New Progressive Hybrid Sand and Its Effect on Surface Structure, Roughness, and Veining Creation within Grey Cast Iron

and

Materials 2023, 16(5), 2004; https://doi.org/10.3390/ma16052004 - 28 Feb 2023

Viewed by 354

Abstract

The constant effort of all metal alloy manufacturing technologies and processes is to improve the resulting quality of the processed part. Not only the metallographic structure of the material is monitored, but also the final quality of the cast surface. In foundry technologies, in addition to the quality of the liquid metal, external influences, such as the behaviour of the mould or core material, significantly affect the cast surface quality. As the core is heated during casting, the resulting dilatations often lead to significant volume changes causing stress foundry defects such as veining, penetration and surface roughness. In the experiment, various amounts of silica sand were replaced with artificial sand and a significant reduction in dilation and pitting of up to 52.9% was observed. An important finding was the effect of the granulometric composition and grain size of the sand on the formation of surface defects from brake thermal stresses. The specific mixture composition can be considered as an effective prevention against the formation of defects instead of using a protective coating. Full article

(This article belongs to the Special Issue Structural Phenomena in Metallic Materials for Demanding Applications)

► Show Figures

Figure 1

Open AccessArticle

Influence of Aging Temperature on Mechanical Properties and Structure of M300 Maraging Steel Produced by Selective Laser Melting

and

Materials 2023, 16(3), 977; https://doi.org/10.3390/ma16030977 - 20 Jan 2023

Viewed by 593

Abstract

This paper deals with the study of high-strength M300 maraging steel produced using the selective laser melting method. Heat treatment consists of solution annealing and subsequent aging; the influence of the selected aging temperatures on the final mechanical properties—microhardness and compressive yield strength—and the structure of the maraging steel are described in detail. The microstructure of the samples is examined using optical and electron microscopy. The compressive test results show that the compressive yield strength increased after heat treatment up to a treatment temperature of 480 °C and then gradually decreased. The sample aged at 480 °C also exhibited the highest observed microhardness of 562 HV. The structure of this sample changed from the original melt pools to a relatively fine-grained structure with a high fraction of high-angle grain boundaries (72%). Full article

(This article belongs to the Special Issue Structural Phenomena in Metallic Materials for Demanding Applications)

► Show Figures

Figure 1

Journal Menu

Journal Browser

Special Issue "Structural Phenomena in Metallic Materials for Demanding Applications"

Share This Special Issue

Special Issue Editor

Special Issue Information

Keywords

Published Papers (4 papers)

Research

Further Information

Guidelines

MDPI Initiatives

Follow MDPI