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Metals
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Advances in Physical Metallurgy
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Advances in Physical Metallurgy

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (30 June 2021) | Viewed by 8604

Special Issue Editors

Prof. Dr. Gregory N. Haidemenopoulos

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Guest Editor
Department of Mechanical Engineering, University of Thessaly, Athens Avenue, Pedion Areos, 38334 Volos, Greece
Interests: physical metallurgy; computational alloy thermodynamics and kinetics; ICME; alloy and process design; metastable austenite in steels; TRIP effects in steels
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Ulrich Prahl

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Guest Editor
Institute of Metal Forming, Technische Universität Bergakademie Freiberg, Bernhard-von-Cotta-Straße 4, 09599 Freiberg, Germany
Interests: ICME—numerical material and process modeling for metallic materials; production processes (forming and heat treatment) for modern steels; development of alloy concepts and process technologies for the nanostructuring of structures as well as for the adjustment of metastable micro-structural phases; combination of experimental laboratory techniques with numerical simulation to model, evaluate and optimize industrial forming and heat treatment processes; forming technology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Although Physical Metallurgy is considered a mature scientific field, spanning more than 200 years of scientific research, the discovery of new alloys, new processing technologies and new characterization techniques make a special issue on “Advances in Physical Metallurgy” a necessary initiative. Important advances have been achieved in the development of new alloys, such as the high entropy alloys (HEA), high-temperature intermetallics, advanced high-strength steels, the development of novel processes, such as additive manufacturing (AM), and the development of modern characterization techniques, such as EBSD tomography and atom probe tomography.

The special issue “Advances in Physical Metallurgy” welcomes research papers and reviews including but not limited to advanced processes and manufacturing of metallic materials, advanced characterization techniques for microstructure and properties in multiple scales, novel alloying concepts and alloy design based on ICME approaches, structural metallic alloys, light metal alloys, high-temperature alloys, corrosion resistant alloys, high-entropy alloys, metal-matrix composites, shape-memory alloys and functional materials, advanced simulation and modeling for microstructure evolution and property description, theoretical advances in computational alloy thermodynamics and kinetics as well as phase equilibria and diffusion.

Prof. Dr. Gregory N. Haidemenopoulos
Prof. Dr. Ulrich Prahl
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. Metals 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

  • Additive manufacturing of metallic components
  • Severe plastic deformation processing
  • Welding and joining technologies
  • Advanced metallic glasses
  • High entropy alloys
  • Advanced high strength steels
  • Lightweight alloys
  • Advanced characterization techniques
  • Advanced mechanical testing of metals
  • Microstructural simulation
  • Alloy and process design based on ICME approaches
  • Mechanical behavior and embrittlement

Published Papers (4 papers)

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Research

17 pages, 7684 KiB  
Article
Powder Forging of in Axial and Radial Direction Graded Components of TRIP-Matrix-Composite
by Markus Kirschner, Sergey Guk, Rudolf Kawalla and Ulrich Prahl
Metals 2021, 11(3), 378; https://doi.org/10.3390/met11030378 - 24 Feb 2021
Cited by 1 | Viewed by 1624
Abstract
Powder metallurgy is one way of producing complex, graded structures that could allow material systems to be produced with properties tailored to individual applications. However, powder metallurgy requires that the semi-finished products are very similar to the final component. It is much more [...] Read more.
Powder metallurgy is one way of producing complex, graded structures that could allow material systems to be produced with properties tailored to individual applications. However, powder metallurgy requires that the semi-finished products are very similar to the final component. It is much more economical to produce simple semi-finished products and then combine them by powder forging and simultaneous compaction than forming complex components with the desired graded structure. However, it is absolutely necessary that the graded structure of the semi-finished products is maintained during the forming process. In this study, pre-sintered cylindrical semi-finished products, consisting of axially graded as well as radially graded components, were produced by powder forging at 1100 °C. The microstructures, densities and mechanical properties of the final components were investigated to verify the effectiveness of the process route. It was observed that the components formed solid structures after compaction, in which the reinforcing ZrO2 particles were fully integrated into the transformation-induced plasticity steel matrix. Full article
(This article belongs to the Special Issue Advances in Physical Metallurgy)
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13 pages, 5058 KiB  
Article
Vacuum Brazing of 55 vol.% SiCp/ZL102 Composites Using Micro-Nano Brazing Filler Metal Fabricated by Melt-Spinning
by Dechao Qiu, Zeng Gao, Xianli Ba, Zhenjiang Wang and Jitai Niu
Metals 2020, 10(11), 1470; https://doi.org/10.3390/met10111470 - 04 Nov 2020
Cited by 10 | Viewed by 2203
Abstract
The joining methods of Aluminum matrix composites reinforced with SiC particles (SiCp/Al MMCs) are a challenge during the manufacturing process due to the significant differences between SiC particles and base aluminum in terms of both physical and chemical properties. Micro-nano brazing [...] Read more.
The joining methods of Aluminum matrix composites reinforced with SiC particles (SiCp/Al MMCs) are a challenge during the manufacturing process due to the significant differences between SiC particles and base aluminum in terms of both physical and chemical properties. Micro-nano brazing filler metal Al-17.0Cu-8.0Mg fabricated by melt-spinning technology was employed to deal with the joining problem of 55 vol.% SiCp/ZL102 composites in this work. The result indicated that the foil-like brazing filler metal contained uniformed cellular nano grains, with a size less than 200 nm. The solidus and liquidus temperatures of the foil-like brazing filler metal decreased by 4 °C and 7 °C in comparison with the values of the as-cast brazing filler metal due to the nanometer size effect. The maximum joint shear strength of 98.17 MPa achieved with a brazing temperature of 580 °C and holding time of 30 min was applied in vacuum brazing process. The width of the brazing seam became narrower and narrower with increasing brazing temperature owning to the strong interaction between the micro-nano brazing filler metal and 55 vol.% SiCp/ZL102 composites. The fracture morphology of the joint made at a brazing temperature of 580 °C was characterized by quasi-cleavage fracture. After brazing, the chemical concentration gradient between the brazing filler metal and base material disappeared. Full article
(This article belongs to the Special Issue Advances in Physical Metallurgy)
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15 pages, 3362 KiB  
Article
Influence of Interface Proximity on Precipitation Thermodynamics
by Kai Wang, Marc Weikamp, Mingxuan Lin, Carina Zimmermann, Ruth Schwaiger, Ulrich Prahl, Martin Hunkel and Robert Spatschek
Metals 2020, 10(10), 1292; https://doi.org/10.3390/met10101292 - 27 Sep 2020
Cited by 1 | Viewed by 1693
Abstract
The formation of coherent precipitates is often accompanied by large elastic mismatch stresses, which suppress phase separation. We discuss the presence of interfaces as a mechanism for stress relaxation, which can lead to preferred zones of precipitation. In particular, we discuss the proximity [...] Read more.
The formation of coherent precipitates is often accompanied by large elastic mismatch stresses, which suppress phase separation. We discuss the presence of interfaces as a mechanism for stress relaxation, which can lead to preferred zones of precipitation. In particular, we discuss the proximity of free surfaces and shear-coupled grain boundaries, for which we can obtain a substantial local energy reduction and predict the influence on the local precipitation thermodynamics. The latter case is accompanied by morphological changes of the grain boundary, which are less suitable for large-scale descriptions. For that purpose, we develop an effective description through an elastic softening inside the grain boundary and map the microscopic grain boundary relaxation to a mesoscopic elastic and phase field model, which also allows generalizing the description to multi-phase situations. Full article
(This article belongs to the Special Issue Advances in Physical Metallurgy)
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16 pages, 3217 KiB  
Article
Modelling and Experimental Validation of the Porosity Effect on the Behaviour of Nano-Crystalline Materials
by Panagiotis Bazios, Konstantinos Tserpes and Spiros Pantelakis
Metals 2020, 10(6), 821; https://doi.org/10.3390/met10060821 - 19 Jun 2020
Cited by 3 | Viewed by 2094
Abstract
Nano-crystalline metals have attracted considerable attention over the past two decades due to their increased mechanical properties as compared to their microcrystalline counterparts. However, the behaviour of nano-crystalline metals is influenced by imperfections introduced during synthesis or heat treatment. These imperfections include pores, [...] Read more.
Nano-crystalline metals have attracted considerable attention over the past two decades due to their increased mechanical properties as compared to their microcrystalline counterparts. However, the behaviour of nano-crystalline metals is influenced by imperfections introduced during synthesis or heat treatment. These imperfections include pores, which are mostly located in the area of grain boundaries. To study the behaviour of multiphase nano-crystalline materials, a novel fully parametric algorithm was developed. The data required for implementing the developed numerical model were the volume fraction of the alloying elements and their basic properties as well as the density and the size of randomly distributed pores. To validate the developed algorithm, the alloy composition 75 wt% tungsten and 25 wt% copper was examined experimentally under compression tests. For the investigation, two batches of specimens were used; a batch having a coarse-grained microstructure with an average grain diameter of 150 nm and a nanocrystalline batch having a grain diameter of 100 nm, respectively. The porosity of both batches was derived to range between 9% and 10% based on X-ray diffraction analyses. The results of quasi-static compression testing revealed that the nanocrystalline W-Cu material exhibited brittle behaviour which was characterised by an elastic deformation that led to fracture without remarkable plasticity. A compressive strength of about 1100 MPa was derived which was more than double compared to conventional W-Cu samples. Finite element simulations of the behaviour of porous nano-crystalline materials were performed and compared with the respective experimental compression tests. The numerical model and experimental observations were in good agreement. Full article
(This article belongs to the Special Issue Advances in Physical Metallurgy)
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