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Special Issue "Preparation and Processing Technology of Advanced Magnesium Alloys"

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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: 10 May 2024 | Viewed by 5124

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Special Issue Editor

Prof. Dr. Ruizhi Wu

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Guest Editor

Department of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
Interests: magnesium alloy; aluminum alloy

Special Issue Information

Dear Colleagues,

As one of the lightest engineering metallic materials, magnesium alloys have become a significant area of research in the field of metal materials. In recent years, more and more reseachers have engaged in reseach about magnesium alloys and their processing technologies.

This Special Issue, titled Preparation and Processing Technology of Advanced Magnesium Alloys, will focus on the newly developments of magnesium alloys. Specifically, it will cover new Mg alloys, the technical of casting, deformation technologies, microstructure characterization, and mechanical and functional properties.

Prof. Dr. Ruizhi Wu
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

magnesium alloy
microstructure
mechanical properties
functional properties
processing technology

Published Papers (5 papers)

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Research

23 pages, 11305 KiB

Open AccessArticle

Influence of Aluminum Content on the Microstructure, Mechanical Properties, and Hot Deformation Behavior of Mg-Al-Zn Alloys

Marie Moses

Madlen Ullmann

and

Ulrich Prahl

Metals 2023, 13(9), 1599; https://doi.org/10.3390/met13091599 - 15 Sep 2023

Cited by 1 | Viewed by 517

Abstract

This study compares AZ91 with AZ31 to investigate the influence of a higher Al content on the resulting microstructure, mechanical properties, and hot deformation behavior. While AZ31 exhibits a globular structure after casting, AZ91 shows a fully developed dendritic structure due to the promotion of dendrites. A heat treatment helped to homogenize AZ31, dissolved a large part of the Mg-Al precipitations in AZ91, and formed globular grains in AZ91. Due to the impact of Al on constitutional supercooling, AZ91 exhibits smaller grains than AZ31. Because of the strengthening of the solid solution, AZ91 also exhibits higher strength and hardness compared to AZ31. Cylindric compression tests of the heat-treated samples were conducted at different temperatures (300–400 °C) and strain rates (0.1 × 10 s⁻¹). The main dynamic recrystallization (DRX) mechanisms in AZ31 and AZ91 are twinning-induced DRX and discontinuous DRX. It was detected that Mg₁₇Al₁₂ precipitates at the grain boundaries in AZ91, which influences the grain size through pinning. Similar results could be conducted in rolling trials. Although both alloys have similar grain sizes after rolling, AZ91 exhibits higher strengths, while AZ31 shows higher ductility. This can be explained by the solid solution strengthening in AZ91 and less brittle Mg₁₇Al₁₂ precipitations in AZ31. Full article

(This article belongs to the Special Issue Preparation and Processing Technology of Advanced Magnesium Alloys)

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13 pages, 7793 KiB

Open AccessArticle

Simultaneous Improvement of Strength, Ductility and Damping Capacity of Single β-Phase Mg–Li–Al–Zn Alloys

Iya I. Tashlykova-Bushkevich

and

Sergey Ya. Betsofen

Metals 2023, 13(1), 159; https://doi.org/10.3390/met13010159 - 12 Jan 2023

Cited by 3 | Viewed by 1087

Abstract

Body-centered cubic (BCC) Mg–Li alloy can be effectively strengthened by with the addition of Al and Zn. However, adding excessive amounts result in reduced mechanical properties and damping capacity of the alloy during subsequent heat treatment and deformation. The effects of solution-hot rolling-aging on the mechanical properties and damping capacity of LAZ1333 alloy and LAZ1366 alloy were studied. The solid solution strengthening greatly increases the hardness of the alloy, but the ductility is extremely poor. The AlLi softening phase precipitated during the subsequent hot rolling and aging process greatly improves the ductility of the alloy, but the excess precipitation of in the AlLi softening phase and the solid solution of excess Zn element are not conducive to the substantial improvement of the strength and ductility of the alloy. Excessive addition of alloying elements is detrimental to the damping capacity of the alloy, but the damping capacity of the alloy can be significantly improved by depleting the number of solute atoms through subsequent ageing treatments. The UTS and FE of as-cast LAZ 1333 alloy are 111 MPa and 16.9%, respectively. The as-aged LAZ1333 alloy has the best mechanical properties and damping capacity, and the UTS and FE are increased by 65.8% and 89.3%, respectively, compared to the as-cast alloy, and the damping capacity increased from 0.011 to 0.015. Full article

(This article belongs to the Special Issue Preparation and Processing Technology of Advanced Magnesium Alloys)

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12 pages, 5481 KiB

Open AccessArticle

BCC-Based Mg–Li Alloy with Nano-Precipitated MgZn₂ Phase Prepared by Multidirectional Cryogenic Rolling

and

Metals 2022, 12(12), 2114; https://doi.org/10.3390/met12122114 - 08 Dec 2022

Cited by 1 | Viewed by 786

Abstract

In this study, we deformed the single β phase Mg–Li alloy, Mg–16Li–4Zn–1Er (LZE1641), with conventional rolling (R) and multi-directional rolling (MDR), both at cryogenic temperature. Results showed that the nano-precipitation phase MgZn₂ appeared in the alloy after MDR, but this phenomenon was not present in the alloy after R. The finite element simulation result showed that the different deformation modes changed the stress distribution inside the alloy, which affected the microstructures and the motion law of the solute atoms. The high-density and dispersively distributed MgZn₂ particles with a size of about 35 nm were able to significantly inhibit the grain boundary migration. They further hindered the dislocation movement and consolidated the dislocation strengthening and fine-grain strengthening effects. Compared with the compressive strength after R (273 MPa), the alloy compressive strength was improved by 21% after MDR (331 MPa). After 100 °C compression, the MgZn₂ remained stable. Full article

(This article belongs to the Special Issue Preparation and Processing Technology of Advanced Magnesium Alloys)

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16 pages, 8582 KiB

Open AccessArticle

Research on Dynamic Marine Atmospheric Corrosion Behavior of AZ31 Magnesium Alloy

and

Metals 2022, 12(11), 1886; https://doi.org/10.3390/met12111886 - 04 Nov 2022

Cited by 4 | Viewed by 1052

Abstract

The dynamic marine atmospheric corrosion behavior of AZ31 magnesium alloy was investigated in situ exposed on the deck of marine scientific research vessel for 1 year. The marine scientific research vessel carried out five voyages from the coast of China to the western Pacific Ocean, while the navigation track and environmental data were collected and analyzed. The corrosion rate and characteristics were evaluated by using weight loss tests, scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and electrochemical measurements. The corrosion rate from weight loss values was 52.23 μm∙y⁻¹ after exposure for 1 year, which was several times higher than that of the static field exposure test in marine atmospheric environment of other reported literature. The main corrosion products were Mg₅(CO₃)₄(OH)₂·4H₂O, MgCO₃·3H₂O and Mg₂(OH)₃Cl·4H₂O. The corrosion was initiated from pitting corrosion and evolved into general corrosion gradually. The serious corrosion maybe due to the harsh corrosive environment with alternating changes in temperature and relative humidity caused by multiple longitude and latitude changes, and particularly high deposition rate of chloride during voyage, which was nearly twenty times that on the coast of China. This study provides effective data for the application of magnesium alloy in shipboard aircraft and other equipment, and provides a reference for indoor simulation experiments. Full article

(This article belongs to the Special Issue Preparation and Processing Technology of Advanced Magnesium Alloys)

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14 pages, 27928 KiB

Open AccessArticle

Evolution of the Microstructure and Mechanical Properties of AZ31 Magnesium Alloy Sheets during Multi-Pass Lowered-Temperature Rolling

and

Metals 2022, 12(11), 1811; https://doi.org/10.3390/met12111811 - 26 Oct 2022

Cited by 1 | Viewed by 1128

Abstract

AZ31 magnesium alloy sheets with 2 mm thickness were successfully fabricated by multi-pass lowered-temperature rolling. The evolution of the microstructure, texture, and mechanical properties during the rolling process was investigated. Based on the effect of multiple dynamic recrystallization, multi-pass lowered-temperature rolling not only refined the grain size obviously but also markedly improved the microstructure homogeneity. The resulting sheets had the optimal microstructure morphology with an average grain size of 4.38 μm. For the texture evolution, the stress state of the rolling process made the (0002) basal plane gradually rotate toward the rolling plane. However, the activation of non-basal slips due to the higher rolling temperature slightly rotated the (0002) basal plane point to the rolling direction (RD). As a result, the grain refinement strengthening and the texture strengthening together increased the yield stress to 202 MPa in the transverse direction (TD) and 189.8 MPa in the RD. Importantly, the resulting sheet concurrently exhibited excellent fracture elongation, about 38% in the TD and 39.2% in the RD. This was mainly ascribed to the finer grain size, giving rise to a significant effect of grain boundary sliding and the activation amount of non-basal slips. Full article

(This article belongs to the Special Issue Preparation and Processing Technology of Advanced Magnesium Alloys)

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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Microstructure and Tensile Behavior of Squeeze Cast Wrought Mg Alloy AZ31
Authors: Ali Dhaif, Wutian Shen, Henry Hu
Affiliation: Dept. Mechanical, Automotive & Materials Engineering, University of Windsor
Abstract: Wrought magnesium alloy AZ31 was squeeze cast (SC) in comparison with the permanent steel mold cast (PSMC) counterpart. The microstructures of the SC and PMSC AZ31 alloys were analyzed by SEM and EDX. There were differences in microstructure features between the SC and PMSC AZ31 alloys. The tensile properties and strain hardening rate of the SC alloy were higher than those of the PSMC sample, which should be attributed to the different microstructure characteristics.

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Special Issue "Preparation and Processing Technology of Advanced Magnesium Alloys"

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