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Metals
Special Issues
Heat Treatment of Non-ferrous Alloys
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Heat Treatment of Non-ferrous Alloys

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

Deadline for manuscript submissions: closed (30 June 2020) | Viewed by 9737

Special Issue Editor

Dr. Hamid Reza Lashgari

E-Mail Website
Guest Editor
School of Materials Science and Engineering, University of New South Wales (UNSW) Australia, Sydney, Australia
Interests: additive manufacturing and 3D printing; metallic glasses; magnetic materials; graphene, cobalt-based implant alloys; aluminum alloys; nanomechanic of metallic materials; failure analysis; heat treatment of ferrous and non-ferrous alloys; phase transformation, mechanical properties of metals and alloys; wear and tribology; corrosion

Special Issue Information

Dear Colleagues,

The microstructure and mechanical properties of a solid material can be controlled by heat treatment, and this enables us to obtain specific properties in a certain alloy. Almost all metals and alloys respond to heat treatment, but individual metals and their alloys may respond in a different way. Among engineering metals and their alloys, non-ferrous alloys have been widely used in high-tech industries such as air space, car manufacturing, and so on. It has always been an on-going demand to develop lighter and stronger materials and one way for doing so is through “engineering of the microstructure” via heat treatment processes. This includes a wide range of heat treatment processes such as annealing of cold-worked metals, recovery and recrystallisation, solid-state and isothermal phase transformation, athermal transformations, and precipitation hardening. Therefore, the study of heat treatment and its concomitant effect on the microstructure and mechanical properties of non-ferrous alloys using advanced material characterisation techniques seems to be essential.

The aim of this Special Issue is to present the latest research related to the heat treatment of non-ferrous alloys (including but not limited to aluminum, magnesium, copper, nickle, cobalt, refractory metals, and titanium alloys) using advanced material characterisation techniques (HRTEM, EBSD, TKD, APT, and so on) to provide us with new insights and a deeper understanding of the correlation between the microstructure and the mechanical properties of non-ferrous alloys. Research papers associated with welding, surface engineering, and corrosion studies of heat-treated non-ferrous alloys are also encouraged to submit their works.

Dr. Hamid Reza Lashgari
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

  • Non-ferrous alloys
  • Heat treatment
  • Phase transformation
  • Advanced materials characterisation
  • Mechanical testing and evaluation
  • Fractography

Published Papers (3 papers)

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Research

7 pages, 4488 KiB  
Article
Particle-Stimulated Nucleation (PSN) in the Co–28Cr–5Mo–0.3C Alloy
by Hamid Reza Lashgari and Shahab Zangeneh
Metals 2020, 10(5), 671; https://0-doi-org.brum.beds.ac.uk/10.3390/met10050671 - 21 May 2020
Cited by 4 | Viewed by 2614
Abstract
The present work is aimed at refining the grain size in the Co–28Cr–5Mo–0.3C (wt%) cast alloy using particle-stimulated nucleation (PSN) of recrystallization. It is pointed out that PSN resulted in considerable grain refinement (≈80%) of the as-cast structure, leading to an increased yield [...] Read more.
The present work is aimed at refining the grain size in the Co–28Cr–5Mo–0.3C (wt%) cast alloy using particle-stimulated nucleation (PSN) of recrystallization. It is pointed out that PSN resulted in considerable grain refinement (≈80%) of the as-cast structure, leading to an increased yield and tensile strength (around 30%). Partial solutionizing is associated with the formation of γfcc and athermal martensite. During PSN, the intensity of the hexagonal close-packed (hcp) phase increases due to the formation of isothermal martensite. It appears that new dynamic recrystallized (DRX) grains are formed around coarse undissolved particles (≈10 μm in size), especially where these particles are present in large clusters. The high-resolution TEM image shows the formation of heavily faulted regions and subgrains, with maximum misorientation near the carbides providing the driving force for the nucleation of new grains. Full article
(This article belongs to the Special Issue Heat Treatment of Non-ferrous Alloys)
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12 pages, 6758 KiB  
Article
The Microstructure and Mechanical Properties of TA1-Low Alloy Steel Composite Plate Manufactured by Explosive Welding
by Ye Cui, Di Liu, Yang Zhang, Guangping Deng, Mingyu Fan, Dan Chen, Lixin Sun and Zhongwu Zhang
Metals 2020, 10(5), 663; https://0-doi-org.brum.beds.ac.uk/10.3390/met10050663 - 20 May 2020
Cited by 13 | Viewed by 2626
Abstract
A TA1 (Ti alloy)/low alloy steel (LAS) composite plate was manufactured by explosive welding. The effects of the bonding interface microstructure on the mechanical properties and fracture behavior of the composite plate were investigated. The results show that the interface has a wavy [...] Read more.
A TA1 (Ti alloy)/low alloy steel (LAS) composite plate was manufactured by explosive welding. The effects of the bonding interface microstructure on the mechanical properties and fracture behavior of the composite plate were investigated. The results show that the interface has a wavy structure with intermetallic compounds (IMCs) enclosed by a steel matrix. The metallurgical bonding interface was achieved by local diffusion, with a several micrometer-thick diffusion layer. Two kinds of microcracks were formed in the IMC region and the diffusion interface. Microcracks in the IMC region propagate with difficulty due to the impediment of the IMC/steel interface. The microcracks initiated at the interface need to propagate into the fine-grain steel matrix before crack connection and delamination. The shear strength of the TA1/LAS composite plate was over 350 MPa. The composite plate could be bent up to the equipment limit (135 degrees). Excellent mechanical properties were obtained since the crack propagation was hindered by the refined or elongated steel grains induced during explosive welding. Full article
(This article belongs to the Special Issue Heat Treatment of Non-ferrous Alloys)
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23 pages, 10468 KiB  
Article
Magnesium Solubility in Primary α-Al and Heat Treatment Response of Cast Al-7Si-Mg
by Jorge Santos, Arne K. Dahle and Anders E. W. Jarfors
Metals 2020, 10(5), 614; https://0-doi-org.brum.beds.ac.uk/10.3390/met10050614 - 8 May 2020
Cited by 8 | Viewed by 3019
Abstract
Magnesium and silicon concentrations in the interior of primary α-Al of Al-7Si-Mg alloys were studied at temperatures in the liquid-solid range and just after solidification was completed. Analysis of the results showed that the magnesium concentration in the interior of primary α-Al is [...] Read more.
Magnesium and silicon concentrations in the interior of primary α-Al of Al-7Si-Mg alloys were studied at temperatures in the liquid-solid range and just after solidification was completed. Analysis of the results showed that the magnesium concentration in the interior of primary α-Al is very low in the temperatures range from the liquidus to the start of the Al-Si eutectic reaction. Formation of silicon-rich phases during eutectic reactions, such as eutectic silicon and β-Al5FeSi, phases trigger a significant increase in the magnesium concentration in the interior of primary α-Al, when sufficient time is allowed for solid-state diffusion to occur. When fast cooling rates are applied during the Al-Si eutectic reaction, most of the magnesium is retained in π-Al8FeMg3Si6 and Mg2Si phases formed during solidification. Semi-solid Al-7Si-Mg castings were produced with varying magnesium contents, and the mechanical properties were evaluated in the as-cast, T5 and T6 conditions. It was found that the 0.2% offset yield strength of the semi-solid Al-7Si-Mg castings in the T5 and T6 conditions increases linearly with the square root of the magnesium concentration in the interior of the α-Al globules formed during the slurry preparation process. Full article
(This article belongs to the Special Issue Heat Treatment of Non-ferrous Alloys)
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