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Crystals
Special Issues
Mechanical and Microstructural Characterization of Metals and Alloys
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Mechanical and Microstructural Characterization of Metals and Alloys

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

Deadline for manuscript submissions: closed (1 March 2020) | Viewed by 11821

Special Issue Editors

Dr. Dario Ripamonti

E-Mail Website
Guest Editor
Consiglio Nazionale delle Ricerche, 00015 Rome, Italy
Interests: mechanical properties; high temperature materials; superalloys; creep; electron microscopy
Special Issues, Collections and Topics in MDPI journals
Dr. Silvia Barella

E-Mail Website
Guest Editor
Department of Mechanics, Politecnico di Milano, Milan, Italy
Interests: metals; plastic defomation; heat treatment; stainless steel
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Economical issues and environmental awareness have led to a demand for the development of high efficiency technologies. Designers of such technologies require deep knowledge of the properties of materials being used, which must be connected with a thorough understanding of their behaviors. The properties of materials are usually determined through laboratory testing, which is sometimes unable to mimic actual working conditions; thus, it is crucial to understand materials’ behavior in order to predict their responses during use. Therefore, strong motivation lies in exploring techniques which allow this two-part task to be accomplished.

This Special Issue will focus on the use of metals and alloys for structural applications, in which the ability to resist to mechanical loads is the key factor. Adequate microstructural analysis is needed to describe and validate results from mechanical testing using cutting-edge techniques in order to develop a fully understanding of the relationship between properties and microstructure.

Dr. Silvia Barella
Dr. Dario Ripamonti
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 2100 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

  • materials for structural applications (steel, light alloys, superalloys)
  • mechanical characterization (static load, fatigue, cracked samples)
  • high temperature behavior (creep, creep-fatigue)
  • properties of additive manufactured components
  • electron microscopy (SEM, TEM, EBSD)
  • thermal analysis (DTA, DSC)
  • X-ray characterization
  • spectroscopy
  • tomography

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Published Papers (4 papers)

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Editorial

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2 pages, 149 KiB  
Editorial
Mechanical and Microstructural Characterization of Metals and Alloys
by Silvia Barella and Dario Ripamonti
Crystals 2020, 10(12), 1111; https://doi.org/10.3390/cryst10121111 - 5 Dec 2020
Viewed by 1335
Abstract
In order to design a fully functional manufactured component the designer needs a deep understanding of the materials behavior, which includes not only its in-service performance but also the effect of the processing routine [...] Full article
(This article belongs to the Special Issue Mechanical and Microstructural Characterization of Metals and Alloys)

Research

Jump to: Editorial

12 pages, 2813 KiB  
Article
A Comparative Study of the Electrochemical Behavior of α and β Phase Ti6Al4V Alloy in Ringer’s Solution
by Monis Luqman, Asiful H. Seikh, Amit Sarkar, Sameh A. Ragab, Jabair A. Mohammed, Muhammad Farzik Ijaz and Hany S. Abdo
Crystals 2020, 10(3), 190; https://doi.org/10.3390/cryst10030190 - 10 Mar 2020
Cited by 16 | Viewed by 3434
Abstract
Owing to their superior biocompatibility, titanium and its alloys are often the first choice for implant materials in biomedical applications, especially for dental and bone repairs (orthodontics and prosthodontics). Titanium has low density and shows good mechanical and chemical properties. Although Ti-6Al-4V alloy [...] Read more.
Owing to their superior biocompatibility, titanium and its alloys are often the first choice for implant materials in biomedical applications, especially for dental and bone repairs (orthodontics and prosthodontics). Titanium has low density and shows good mechanical and chemical properties. Although Ti-6Al-4V alloy exhibits excellent corrosion resistance properties, the metal ions released during corrosion are likely to induce aseptic loosening in long-term implantations. In the present study, Ti-6Al-4V alloy was subjected to two specific heat treatments, namely, air cooling and water quenching. The potentiodynamic polarization and electrochemical impedance spectroscopy measurements revealed remarkable improvement in the corrosion resistance properties of the heat-treated specimens. The presence of the β phase is a plausible reason for the improvement. Scanning electron microscopy, X-ray diffraction phase composition analysis, and microstructural characterization were performed to confirm the presence of the β phase. Full article
(This article belongs to the Special Issue Mechanical and Microstructural Characterization of Metals and Alloys)
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9 pages, 14843 KiB  
Article
Control of Microstructure for Co-Cr-Mo Fibers Fabricated by Unidirectional Solidification
by Shoki Abe, Yuui Yokota, Takayuki Nihei, Masao Yoshino, Akihiro Yamaji, Satoshi Toyoda, Hiroki Sato, Yuji Ohashi, Shunsuke Kurosawa, Kei Kamada and Akira Yoshikawa
Crystals 2020, 10(1), 11; https://doi.org/10.3390/cryst10010011 - 26 Dec 2019
Cited by 1 | Viewed by 2544
Abstract
Co-Cr-Mo alloy fibers of 2 mm in diameter were fabricated from the melt at 1, 2, and 5 mm/min growth rates by unidirectional solidification using an alloy-micro-pulling-down (A-µ-PD) method to control the microstructure. All elements, Co, Cr, and Mo, were distributed in stripes [...] Read more.
Co-Cr-Mo alloy fibers of 2 mm in diameter were fabricated from the melt at 1, 2, and 5 mm/min growth rates by unidirectional solidification using an alloy-micro-pulling-down (A-µ-PD) method to control the microstructure. All elements, Co, Cr, and Mo, were distributed in stripes elongated along the growth direction due to constitutional undercooling. Both Co-Cr-Mo fibers fabricated at 2 and 5 mm/min growth rates were composed of the γ phase with a face-centered cubic structure (fcc-γ phase) and ε-phase with a hexagonal close-packed structure (hcp-ε phase), and the ratio of the fcc-γ phase in the fiber fabricated at 5 mm/min growth rate was higher than that in the fiber fabricated at 2 mm/min. The results suggest that a faster growth rate increases the ratio of the fcc-γ phase in the Co-Cr-Mo fiber fabricated by unidirectional solidification. Full article
(This article belongs to the Special Issue Mechanical and Microstructural Characterization of Metals and Alloys)
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17 pages, 14090 KiB  
Article
Dissimilar Infrared Brazing of CoCrFe(Mn)Ni Equiatomic High Entropy Alloys and 316 Stainless Steel
by Chieh Lin, Ren-Kae Shiue, Shyi-Kaan Wu and Yu-Sy Lin
Crystals 2019, 9(10), 518; https://doi.org/10.3390/cryst9100518 - 9 Oct 2019
Cited by 15 | Viewed by 3983
Abstract
Dissimilar infrared brazing of CoCrFeMnNi/CoCrFeNi equiatomic high entropy alloys and 316 stainless steel using MBF601 and BNi-2 foils was evaluated. The wetting angles of the two fillers at 50 °C above their liquidus temperatures on the three substrates were below 40 degrees. The [...] Read more.
Dissimilar infrared brazing of CoCrFeMnNi/CoCrFeNi equiatomic high entropy alloys and 316 stainless steel using MBF601 and BNi-2 foils was evaluated. The wetting angles of the two fillers at 50 °C above their liquidus temperatures on the three substrates were below 40 degrees. The CoCrFeMnNi/316 SS joint had the highest shear strength of 361 MPa with BNi-2 filler brazing at 1020 °C for 180 s, and fractured at the CrB compound in the joint. The CoCrFeMnNi/MBF601/316 SS joint contained a CoCrFeMnNi-based matrix, phosphides and B-containing compounds. The CoCrFeNi/316 SS joint had the highest shear strength of 374 MPa when brazed with BNi-2 filler at 1020 °C for 600 s, and fractured at the CrB in the joint. The CoCrFeNi/MBF601/316 SS joint consisted of a (Fe,Ni)-rich matrix, phosphides and B/Cr/Fe/P compounds, and the highest shear strength of 324 MPa was achieved when it was brazed at 1080 °C for 600 s. Full article
(This article belongs to the Special Issue Mechanical and Microstructural Characterization of Metals and Alloys)
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