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Metals
Special Issues
Strengthening Mechanisms of Metals and Alloys
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Strengthening Mechanisms of Metals and Alloys

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 September 2022) | Viewed by 8173

Special Issue Editor

Dr. Marta Cabeza Simo

E-Mail Website
Guest Editor
Senior Lecturer, Department of Materials Science and Engineering, University of Vigo, 36310 Vigo, Spain
Interests: microstructure characterization; manufacturing processes; heat treatments; mechanical properties; tribology; corrosion and electrochemical behavior
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

For many years, the goal of materials engineering has been to increase the strength of metals and alloys. Meeting this objective generally entails a reduction in toughness. The challenge, nowadays, is developing strategies to improve both properties or, at least, to produce a moderate effect in improving fracture resistance. For this, a good knowledge of the strengthening mechanisms in different metals and alloys is required. This Special Issue of Metals focuses on various aspects of advanced research toward understanding the following aspects of strengthening mechanisms:

  • Their role in innovative processing routes for manufacture of structural components;
  • The importance of alloy design in determining efficacy;
  • The role of nanoparticles in MMCs reinforced by different process routes;
  • Microstructural characterization techniques;
  • How the different strengthening mechanisms affect the surface properties of metals and alloys;
  • Simulation and modeling;
  • Strengthening against high-temperature deformation (creep) and against fatigue.

Dr. Marta Cabeza Simo
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. 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

  • Microstructure characterization
  • Process technologies
  • Mechanical properties
  • Simulation and modeling
  • Light metals and alloys
  • Steels
  • Superalloys
  • Metal matrix composites

Published Papers (4 papers)

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Research

12 pages, 7606 KiB  
Article
Combining Heat Treatment and High-Pressure Torsion to Enhance the Hardness and Corrosion Resistance of A356 Alloy
by Mohamed Abdelgawad Gebril, Mohd Zaidi Omar, Intan Fadhlina Mohamed, Norinsan Kamil Othman and Osama M. Irfan
Metals 2022, 12(5), 853; https://doi.org/10.3390/met12050853 - 17 May 2022
Cited by 5 | Viewed by 1577
Abstract
A356 aluminium alloy is subjected to heat treatment and high-pressure torsion (HPT) processing to investigate the impact of the combined treatments on the alloy’s microstructure refinement, corrosion resistance and hardness. The high-pressure torsion process was performed at room temperature for 0.75 and 5 [...] Read more.
A356 aluminium alloy is subjected to heat treatment and high-pressure torsion (HPT) processing to investigate the impact of the combined treatments on the alloy’s microstructure refinement, corrosion resistance and hardness. The high-pressure torsion process was performed at room temperature for 0.75 and 5 turns. Subjecting the A356 Al alloy to a heat treatment and subsequent HPT processing produced a more refined microstructure, which has the effect of enhancing the alloy hardness and corrosion resistance under fragmentation and the homogenous redistribution of the intermetallic compounds and the Si particles. The results of the treatment show that there is a marked increase in hardness when imposing a strain from 61 HV to 198 HV on the A356 Al alloy, which has been HPTed and heat-treated for five turns. The polarisation curves show that there is a considerable improvement in the corrosion resistance rate of the alloy from 0.043 mm·year−1 for the A356 Al alloy sample to 0.003 mm·year−1 after five turns of HPT. In this work, the microstructure refinement resulted in the improvement of both the mechanical strength and corrosion resistance of the aluminium 356 alloy after heat treatment in comparison to the untreated alloy. Full article
(This article belongs to the Special Issue Strengthening Mechanisms of Metals and Alloys)
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17 pages, 22593 KiB  
Article
Strengthening Mechanisms of Aluminum Matrix Nanocomposites Reinforced with CNTs Produced by Powder Metallurgy
by Íris Carneiro, José Valdemar Fernandes and Sónia Simões
Metals 2021, 11(11), 1711; https://doi.org/10.3390/met11111711 - 27 Oct 2021
Cited by 8 | Viewed by 2022
Abstract
The present work aims to investigate the strengthening mechanisms in aluminum matrix nanocomposites reinforced by carbon nanotubes (CNTs). A classical powder metallurgy route produced Al-CNT nanocomposites using ultrasonication and ball milling as dispersion/mixture techniques. The microstructural characterization is crucial for this study to [...] Read more.
The present work aims to investigate the strengthening mechanisms in aluminum matrix nanocomposites reinforced by carbon nanotubes (CNTs). A classical powder metallurgy route produced Al-CNT nanocomposites using ultrasonication and ball milling as dispersion/mixture techniques. The microstructural characterization is crucial for this study to reach the objective, being performed mainly by electron backscattered diffraction (EBSD), transmission electron microscopy (TEM), and high-resolution TEM (HRTEM). Uniform dispersion without damaging the CNTs structure is the key for the nanocomposite by powder metallurgy production process. The reinforcement effect occurs due to several strengthening mechanisms that act simultaneously. For the Al-CNT nanocomposites produced by ultrasonication as a dispersion/mixture technique, the observed improvement in the mechanical properties of nanocomposites can be attributed to the load transfer from the matrix to the CNTs. The strain hardening and the second-phase hardening can also have a small contribution to the strengthening of the nanocomposites. Full article
(This article belongs to the Special Issue Strengthening Mechanisms of Metals and Alloys)
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16 pages, 11265 KiB  
Article
Deformation Mechanism Investigation on Low Density 18Mn Steels under Different Solid Solution Treatments
by Yong-Tao Huo, Yan-Lin He, Na-Qiong Zhu, Min-Long Ding, Ren-Dong Liu and Yu Zhang
Metals 2021, 11(9), 1497; https://doi.org/10.3390/met11091497 - 21 Sep 2021
Cited by 4 | Viewed by 1703
Abstract
To meet the demand of the 10% weight reduction goal for automotive steel, the microstructure and mechanical properties of Fe-18Mn-Al-C steel with different carbon and aluminum contents were investigated under different solid solution treatments, and the deformation mechanisms of the experimental steels were [...] Read more.
To meet the demand of the 10% weight reduction goal for automotive steel, the microstructure and mechanical properties of Fe-18Mn-Al-C steel with different carbon and aluminum contents were investigated under different solid solution treatments, and the deformation mechanisms of the experimental steels were elucidated. Aided by thermodynamic calculation, transmission electron microscopy (TEM) and in situ scanning electron microscope (SEM) analysis, it was shown that for the 18Mn-1.5Al experimental steel with about 20 mJ/m2 stacking fault energy (SFE), the twinning-induced plasticity (TWIP) effect always dominated in this steel after different solid solution treatments under tensile deformation. With the 7 wt% aluminum addition, the SFE of austenite was affected by temperature and the range of SFE was between 60 and 65 mJ/m2. The existence of δ-ferrite obviously inhibited the TWIP effect. With the increase in the solution treatment temperature, δ-ferrite gradually transformed into the austenite, and the n-value remained low and stable in a large strain range, which were caused by the local hardening during the tensile deformation. Due to the difference in the deformability of the austenite and δ-ferrite structure as well as the inconsistent extension of the slip band, the micro-cracks were easily initiated in the 18Mn-7Al experimental steel; then, it exhibited lower plasticity. Full article
(This article belongs to the Special Issue Strengthening Mechanisms of Metals and Alloys)
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15 pages, 8298 KiB  
Article
Effect of V Addition on Microstructure and Mechanical Properties in C–Mn–Si Steels after Quenching and Partitioning Processes
by Gong-Ting Zhang, Na-Qiong Zhu, Bo-Wei Sun, Zheng-Zhi Zhao, Zhi-Wang Zheng, Di Tang and Lin Li
Metals 2021, 11(8), 1306; https://doi.org/10.3390/met11081306 - 18 Aug 2021
Cited by 3 | Viewed by 1823
Abstract
Three C-Si-Mn Q&P steels with different V addition after one-step and two-step quenching and partitioning (Q&P) processes were investigated by means of optical microstructure observation, X-ray diffraction (XRD) measurement, transmission electron microscopy (TEM) characterization and particle size distribution (PSD) analysis. The effect of [...] Read more.
Three C-Si-Mn Q&P steels with different V addition after one-step and two-step quenching and partitioning (Q&P) processes were investigated by means of optical microstructure observation, X-ray diffraction (XRD) measurement, transmission electron microscopy (TEM) characterization and particle size distribution (PSD) analysis. The effect of V addition on strength and ductility of the steels was elucidated by comparative analysis on the microstructure and mechanical properties as functions of partitioning time and temperature. For one-step Q&P treatment, the mechanical properties were mainly controlled by the tempering behavior of martensite during partitioning. V addition was helpful to mitigate the deterioration of mechanical properties by precipitation strengthening and grain refinement strengthening. For two-step Q&P treatment, the satisfying plasticity was attributed to the transformation-induced plasticity (TRIP) effect of retained austenite maintaining the high work hardening rate at high strain regime. The higher volume fraction of retained austenite with high stability resulted from the refined microstructure and the promoted carbon partitioning for the steel with 0.16 wt% V addition. However, the carbon consumption due to the formation of VC carbides led to the strength reduction of tempered martensite. Full article
(This article belongs to the Special Issue Strengthening Mechanisms of Metals and Alloys)
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