Special Issue "Microstructure and Physical Properties of Magnesium Alloys and Composites"

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

Deadline for manuscript submissions: closed (30 September 2018).

Special Issue Editor

Prof. Dr. Pavel Lukáč
E-Mail Website
Guest Editor
Charles University, Faculty of Mathematics and Physics, Department of Physics of Materials, Ke Karlovu 3, 121 16 Praha 2, Czech Republic
Interests: Metallic materials; Single crystals, polycrystals, submicrocrystalline materials, nanocrystals, composites; grains, grain boundary, crystal defects; Deformation behaviour, solid solution hardening, precipitation strengthening, high temperature plasticity, creep, hardening/softening, thermally activated flow, dislocations, climb of dislocations, twins, superplasticity; Properties, mechanical properties, thermal conductivity, electrical conductivity, thermal expansion, damping, microstructure; Severe plastic deformation, accumulative roll bonding, equal-channel angular pressing, high-pressure torsion
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

In the past two decades, the mechanical properties of magnesium alloys and composite has been extensive studied. The deformation behavior, strength, and ductility of the alloys and composites have been determined as a function of microstructures (chemical composition, grain size, foreign atoms, second phase precipitates) and textures. New magnesium alloys have been developed and their mechanical properties have been extensively studied. To the contrary, only limited information on their physical properties have been published,

The physical properties of magnesium alloys are affected by their microstructure evolution. The effects of extrusion, rolling and severe plastic deformation (SPD) techniques (such as ECAP, HPT, ARB) on their physical properties should be investigated, SPD provides a technique suitable for producing microstructures with ultrafine grains. Therefore, it is important to study how the processing methods change the thermal properties—coefficient of thermal expansion, thermal conductivity/diffusivity—and electrical conductivity. Investigations of the effect of the texture formed during processing on the thermal conductivity anisotropy is of great importance for applications. The alloy composition and structure defects influence also the damping characteristics. The electrical resistivity of Mg alloys is a function of the alloy composition, foreign atom concentration, dislocation density, grain size.

Reinforcements (fibres/particles), their size, volume fraction, mechanical and thermal properties have a significant effect on the physical properties od composites. Knowledge of physical properties of magnesium alloys and composites is important in many fields of science and engineering applications.

The purpose of the paper submitted to this Special Issue is to extend our current knowledge on the physical properties of magnesium alloys and composites. Your contributions are welcome.

Prof. Dr. Pavel Lukáč
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 papers will be 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 1400 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

  • Coefficient of thermal expansion
  • Thermal conductivity/diffusivity
  • Electrical conductivity
  • Internal friction/damping
  • Elastic constants
  • Modelling
  • Material processing-physical property relationship

Published Papers (5 papers)

Order results
Result details
Select all
Export citation of selected articles as:

Research

Open AccessArticle
Evaluation of the Effect of Nd Content and Extrusion Process on Thermal Conductivity of Mg-Mn-Zn-Nd Alloys
Crystals 2018, 8(11), 427; https://doi.org/10.3390/cryst8110427 - 14 Nov 2018
Abstract
The thermal conductivity of the Mg-1Mn-2Zn-xNd alloys (x = 0.5, 1.0, 1.5 wt. %) was studied for the potential applications of heat dissipation. The phase constituents were examined by X-ray diffraction analysis, and the microstructure was observed by light and scanning electron microscopes. [...] Read more.
The thermal conductivity of the Mg-1Mn-2Zn-xNd alloys (x = 0.5, 1.0, 1.5 wt. %) was studied for the potential applications of heat dissipation. The phase constituents were examined by X-ray diffraction analysis, and the microstructure was observed by light and scanning electron microscopes. The thermal conductivity of the Mg alloys was gauged at room temperature using laser flash method. The experimental results indicate that the thermal conductivity of both the cast and extruded Mg alloys decreases slowly with Nd content, and the extrusion process remarkably reduces the grain sizes and thermal conductivity of the Mg alloys. The thermal conductivity of cast Mg-1Mn-2Zn-xNd alloys exceeds the required critical value (100 W/(m·k)) for the cast Mg alloys. Among them, the cast Mg-1Mn-2Zn-1Nd alloy has great potential to be a good candidate of heat dissipation materials due to its good combination of thermal and mechanical properties. Full article
Show Figures

Figure 1

Open AccessArticle
Microstructure and Mechanical Properties of Mg–6Al–1Sn–0.3Mn Alloy Sheet Fabricated through Extrusion Combined with Rolling
Crystals 2018, 8(9), 356; https://doi.org/10.3390/cryst8090356 - 05 Sep 2018
Cited by 3
Abstract
Hot rolling was carried out in this study to modify the microstructures of an extruded Mg–6Al–1Sn–0.3Mn alloy sheet and investigate its effects on mechanical properties. After hot rolling, the grains and second phase of the extruded alloy sheet were remarkably refined, and the [...] Read more.
Hot rolling was carried out in this study to modify the microstructures of an extruded Mg–6Al–1Sn–0.3Mn alloy sheet and investigate its effects on mechanical properties. After hot rolling, the grains and second phase of the extruded alloy sheet were remarkably refined, and the c-axis of a few grains was parallel to the transverse direction. The strength improvement was mainly attributed to the grain and Mg17Al12 particle refinement due to the Hall–Petch effect and the Orowan mechanism. The random orientation of the fine grains resulted in improving ductility and anisotropy. Full article
Show Figures

Graphical abstract

Open AccessArticle
Thermal Conductivity of an AZ31 Sheet after Accumulative Roll Bonding
Crystals 2018, 8(7), 278; https://doi.org/10.3390/cryst8070278 - 02 Jul 2018
Cited by 4
Abstract
Accumulative roll bonding (ARB) is one of the methods of severe plastic deformation which is relevant for industrial production of sheets. While mechanical properties of several magnesium alloys subjected to the ARB process have been studied, the physical properties have been reported only [...] Read more.
Accumulative roll bonding (ARB) is one of the methods of severe plastic deformation which is relevant for industrial production of sheets. While mechanical properties of several magnesium alloys subjected to the ARB process have been studied, the physical properties have been reported only for some magnesium alloys. These properties are influenced by the texture developed during the ARB process and the temperature load. In the presented contribution, we studied thermal conductivity of an AZ31 magnesium alloy after one and two passes through the rolling mill. Thermal diffusivity was measured with the laser-flash method in the temperature range between 20 and 350 °C. Thermal conductivity depends on the number of rolling passes. The microstructure and texture of sheets are significant factors influencing thermal properties. Full article
Show Figures

Graphical abstract

Open AccessArticle
The Mechanical Properties and Corrosion Resistance of Magnesium Alloys with Different Alloying Elements for Bone Repair
Crystals 2018, 8(7), 271; https://doi.org/10.3390/cryst8070271 - 28 Jun 2018
Abstract
In order to make a rational design of magnesium alloys for bone repair, four kinds of Mg alloy ingots were prepared by vacuum induction furnace, namely Mg-3Zn-0.2Ca (wt.%) (ZX30), Mg-3Zn-0.8Zr (wt.%) (ZK30), Mg-3Zn-0.8Zr-0.3Sr (wt.%) (ZKJ300) and Mg-3Zn-0.8Zr-0.3Ca-0.3Ag (wt.%) (ZKXQ3000) alloys. The four ingots [...] Read more.
In order to make a rational design of magnesium alloys for bone repair, four kinds of Mg alloy ingots were prepared by vacuum induction furnace, namely Mg-3Zn-0.2Ca (wt.%) (ZX30), Mg-3Zn-0.8Zr (wt.%) (ZK30), Mg-3Zn-0.8Zr-0.3Sr (wt.%) (ZKJ300) and Mg-3Zn-0.8Zr-0.3Ca-0.3Ag (wt.%) (ZKXQ3000) alloys. The four ingots were extruded into bar materials through a hot-extrusion process under different temperatures with different extrusion ratios, the mechanical performances and the corrosion behaviors in the simulated body fluid (SBF) of the four alloys were investigated, and the mechanism of fracture and corrosion was characterized by scanning electron microscopy (SEM). The results showed the ultimate compressive strength (UCS) of all the alloys were found to be around 360 MPa, while ultimate tensile strengths (UTS) of ZKJ300 (334.61 ± 2.92 MPa) and ZKXQ3000 (337.56 ± 2.19 MPa) alloys were much higher than those of ZX30 (298.17 ± 0.93 MPa) and ZK30 (293.26 ± 2.71 MPa) alloys. The electrochemical noise and immersion tests in the SBF indicated that ZK30 alloy performed better in corrosion resistance. Full article
Show Figures

Graphical abstract

Open AccessArticle
The Effects of Rare Earth Pr and Heat Treatment on the Wear Properties of AZ91 Alloy
by Ning Li and Hong Yan
Crystals 2018, 8(6), 256; https://doi.org/10.3390/cryst8060256 - 19 Jun 2018
Cited by 1
Abstract
This paper investigated the influences of Pr addition and heat treatment (T6) on the dry sliding wear behavior of AZ91 alloy. The wear rates and friction coefficients were measured by using a pin-on-disc tribometer under loads of 30, 60 and 90 N at [...] Read more.
This paper investigated the influences of Pr addition and heat treatment (T6) on the dry sliding wear behavior of AZ91 alloy. The wear rates and friction coefficients were measured by using a pin-on-disc tribometer under loads of 30, 60 and 90 N at dry sliding speeds of 100 rpm, over a sliding time of 15 min. The worn surfaces were examined using a scanning electron microscope and was analyzed with an energy dispersive spectrometer. The experimental results revealed that AZ91-1.0%Pr magnesium alloy exhibited lower wear rate and friction coefficient than the other investigated alloys. As the applied load increased, the wear rate and friction coefficient increased. Compared with the as-cast AZ91-1.0%Pr magnesium alloy, the hardness and wear resistance of the alloy after solution treatment were reduced, and through the subsequent aging, the hardness and wear resistance of the alloy were improved and the hardness was 101.1 HB (compared to as-cast AZ91 magnesium alloy, it increased by 45%). The AZ91-1.0%Pr with T6 magnesium alloy exhibited best wear resistance. Abrasion was dominant at load of 30 N, delamination was dominant at load of 60 N and plastic deformation was dominant at load of 90 N. Oxidation was observed at all loads. Full article
Show Figures

Figure 1

Back to TopTop