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Dissertations / Theses on the topic 'Mg (Magnesium)'

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Published: 4 June 2021

Last updated: 4 February 2022

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1

Barnackas, Irmantas. "Investigation of hydrogenation kinetics of magnesium and magnesium alloys in the ionized reactive atmosphere." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20080919_140633-22213.

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In the present work Mg and MgAl thin films were fabricated using physical vapour deposition (PVD) technologies as non-traditional and new nanotechnology methods for designing high performance hydrogen storage materials. The physical vapour deposition technologies allow the formation of metastable metal, alloy and chemical compounds with strictly controlled composition, microstructure and stoichiometry at low temperatures. The synthesis of MgH2, MgAl and Mg(AlH4)2 films has been conducted in two steps: (i) fabrication of thin films employing magnetron sputtering in Ar gas, and (ii) hydrogenati

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2

Diplas, Spyridonas. "Bulk surface studies of vapour deposited Mg-V and Mg-Zr alloys." Thesis, University of Surrey, 1998. http://epubs.surrey.ac.uk/844498/.

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Mg-V and Mg-Zr alloys with nominal compositions 1, 6, 17.5, 27 wt% V and 2, 8.6 and 10.6 wt% Zr respectively were produced by PVD. All deposits exhibited compositional inhomogeneity, columnar microstructures and a strong basal texture. The solid solubilities of V and Zr in Mg were extended approximately to 17 wt% V and 10 wt% respectively. Grain refinement occurred with increasing solute content. The solid solution break up temperature decreased as the V and Zr content in the alloys increased. Pure V precipitated when the extended solid solubility of was exceeded. Both c and a lattice paramete

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3

Samuel, Ehab. "Serrated flow and enhanced ductility in coarse-grained Al-Mg alloys." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115867.

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Aluminum 5XXX alloys are of industrial importance and interest as they combine a wide range of desirable strength, forming and welding characteristics with a high resistance to corrosion. The presence of Mg in these alloys ensures favorable mechanical properties. However, the room temperature stretching performance of these alloys is limited. Moreover, Al-Mg alloys are known for being susceptible to the Portevin-LeChatelier effect when deformed at room temperature. Nevertheless, improvements in ductility can be achieved through warm forming, especially when the ductility approaches superplasti

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4

TERREMOTO, LUIS A. A. "Experimento de coincidência sup(26)Mg(e,e'c)." reponame:Repositório Institucional do IPEN, 1993. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11627.

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Made available in DSpace on 2014-10-09T12:54:02Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:09:11Z (GMT). No. of bitstreams: 1 12441.pdf: 10808481 bytes, checksum: d5cd417d1d3b2db950bcbe8c2c2da156 (MD5)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Fisica, Universidade de Sao Paulo - IF/USP

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5

Baliga, Chaitanya B. "Bulk and surface studies of rapidly solidified Mg Al alloys." Thesis, University of Surrey, 1990. http://epubs.surrey.ac.uk/843174/.

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The effect of aluminium additions on the structure and morphology of the corrosion products formed on the surfaces of rapidly solidified Mg-Al alloy splats immersed at room temperature in a solution of 3%NaCl saturated with Mg(OH)2; has been studied under different analytical techniques. The adverse effect of contamination from copper particles during processing on the corrosion behaviour of the alloys is also highlighted. Aluminium additions were beneficial to the corrosive behaviour of the alloys with a marked improvement in their anti-corrosion resistance occurring in alloys containing more

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6

Buey, Daniel. "Modeling non-basal deformation modes in Mg-Y and other Mg-RE alloys." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1532081086077038.

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7

Nave, Mark D. "Eutectic solidification in hypoeutectic mg-al alloys /." [St. Lucia, Qld.], 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16136.pdf.

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8

Dalgard, Elvi C. "Phase diagram studies in the Mg-rich corner of the Mg-Ce-In ternary system." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100225.

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In the present study, dilute alloys in the Mg-rich corner of the Mg-Ce-In ternary system in the composition range 0 to 3% In and 0 to 1.5% Ce were synthesized. Cooling curve analysis was used to determine the liquidus points in order to construct the liquidus surface of the ternary phase diagram in the Mg corner. Energy dispersive spectroscopy (EDS), wavelength dispersive spectroscopy (WDS), and x-ray diffraction (XRD) techniques were used to examine phases present at the compositions studied. A thermal arrest presumed to represent a eutectic transformation was discovered at 580°C. Two new int

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9

Sumitomo, Taro. "Elastic and pseudoelastic behaviour of Mg-Al-Zn alloys /." St. Lucia, Qld, 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17435.pdf.

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10

Battocchi, Dante. "The Development, Characterization and Testing of Mg-rich Primers." Diss., North Dakota State University, 2012. https://hdl.handle.net/10365/26453.

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Aluminum alloys are widely used in aircraft industry for their strength and light weight. Those alloys that are hardened by precipitation, especially the Copper-rich of the 2000 series, are prone to corrosion and are protected against it using chromate containing coatings. The primary component of these coating systems is Chromium 6+ (CrVI) that has been found to be very toxic in the environment and carcinogenic, toxic and mutagenic in humans. The Mg-rich primer development is the result of a successful multi-year project funded by the US Air-force with its objective the replacement of coat

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11

Akyildiz, Hasan. "Hydrogen Storage In Magnesium Based Thin Film." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612652/index.pdf.

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ABSTRACT HYDROGEN STORAGE IN MAGNESIUM BASED THIN FILMS Akyildiz, Hasan Ph.D., Department of Metallurgical and Materials Engineering Supervisor : Prof. Dr. Tayfur &Ouml<br>zt&uuml<br>rk Co-Supervisor : Prof. Dr. Macit &Ouml<br>zenbas October 2010, 146 pages A study was carried out for the production of Mg-based thin films which can absorb and desorb hydrogen near ambient conditions, with fast kinetics. For this purpose, two deposition units were constructed<br>one high vacuum (HV) and the other ultra high vacuum (UHV) deposition system. The HV system was based on a pyrex bell jar

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12

Subramaniam, Anandh. "Metastable Phases In Mg-Based Alloys." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/187.

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Mg-based alloys form a variety of interesting structures including stable and metastable crystalline, stable and metastable quasicrystalline, nanocrystalline and amorphous phases. Many of these phases can be made to coexist by suitable processing leading to an interesting combination of properties. Non-equilibrium processing in combination with suitable heat treatments can be used to control the scale and dispersion of these phases. Further thrust to Mg-based alloys is expected through the development of Mg-based bulk metallic glasses. Magnesium matrix composites are also gaining in prominence

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13

Moleková, Kristína. "Zpracování práškových materiálů na bázi Mg metodou SPS." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2019. http://www.nusl.cz/ntk/nusl-401923.

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Diploma thesis occupy with preparation of porous material from magnesium powder with a HAp admixture by cold pressing followed by spark plasma sintering (SPS). This thesis contain both preparation of bulk material, diffusion plot and charakterization of materials based on the compaction process conditions. On the basis of physical mechanical characteristics, the impact of the pressing process on the subsequent sintering and the resulting material properties are evaluated. Bulk material is characterized considering to structure and physical–mechanical properties. Properties of final metarial wi

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14

Borkar, Hemant. "Texture and microstructure on magnesium-magnase-strontium (Mg-Mn-Sr) extrusion alloys." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=114461.

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Wrought Mg alloys have received increasing attention for automotive body applications for the past few years due to their potential for weight reduction. The Mg-1%Mn (M1) alloy is one of the few conventional Mg alloys that may offer good formability; however, its low strength is a major concern. One disadvantage of most extruded Mg alloys is their crystallographic orientation which influences formability. The extrusion of Mg alloys gives strong final texture where basal planes align with the extrusion axis resulting in tensile-compressive yield asymmetry. It has been experimentally established

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15

Vogel, Michael. "Mikrostruktur und Kriechverhalten von Magnesium-Druckgusslegierungen im System Mg-Zn-Al-Ca." [S.l. : s.n.], 2002. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10361090.

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16

Wu, Tso-chang. "Laser Surface Modification of AZ31B Mg Alloy Bio-Implant Material." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1248459/.

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Magnesium and its alloys are considered as the potential biomaterials due to their biocompatibility and biodegradable characteristics but suffer from poor corrosion performance. Various surface modification techniques are employed to improve their corrosion resistance. In present case, laser surface melting was carried out on AZ31B Mg alloy with various laser energy densities using a continuous wave ytterbium laser. Effect of laser treatment on phase and microstructure evolution was evaluated by X ray diffraction and scanning electron microscopy. Multi-physics thermal model predicted time temp

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17

Kolbeinsson, Ingólfur. "A Novel Processing Route for the Manufacture of Mg with Controlled Cellular Structure." Thesis, University of Canterbury. Mechanichal Engineering, 2009. http://hdl.handle.net/10092/4294.

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Cellular metals are a relatively new class of engineering materials that can be fabricated with either a random or controlled cellular structure. A controlled cellular structure allows the precise control of the pore geometry and hence subsequent material properties that can be important for some applications such as orthopathic implants. Recently the interest in using magnesium (Mg) as a biodegradable implant in the body has been growing rapidly. However, current methods for fabricating cellular magnesium typically results in a random arrangement of the cellular structure. A novel processing

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18

Wong, Sau-shun, and 黃守淳. "Investigation on Mg-Mn-Zn alloys as potential biodegradable materials for orthopaedic applications." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2015. http://hdl.handle.net/10722/208603.

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In fracture management with open reduction and internal fixation with metallic implant, secondary procedure of removal of implant is often required. Such procedure causes additional surgical risks to patients, including anaesthetic risks, wound infection, bone infection, soft tissue adhesion and joint stiffness. The procedure is also costly to the patient and society. If the fixation implant is self-resorbable, the need for secondary surgery will be completely eliminated and the social resources can be saved. Making use of the corrosion process, metals can be developed into new generation o

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19

Yu, Fang. "Abiotic Degradation of Chlorinated Hydrocarbons (CHCs) with Zero-Valent Magnesium (ZVM) and Zero-Valent Palladium/Magnesium Bimetallic (Pd/Mg)-Reductant." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1373881146.

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20

Phasha, Maje Jacob. "Fundamental study of immiscible Ti-Mg system : ball milling experiments and ab initio modelling." Thesis, University of Limpopo, Turfloop Campus, 2013. http://hdl.handle.net/10386/1395.

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Thesis (Ph. D. (Physics)) -- University of Limpopo, 2013.<br>A combination of ball milling experiments and ab initio calculations in this study successfully yielded results that shed light into understanding the fundamental basis for immiscibility and the concept of mechanical alloying in Ti-Mg system. In addition, the conditions for achieving extended solid solubility in elements that usually do not dissolve in each other under thermodynamic equilibrium conditions have been predicted using ultrasoft (US) and norm-conserving (NC) pseudopotentials. Hydostatic pressures required to stabilize ord

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21

Banjade, Dila Ram. "Fundamental Investigation of Magnesium Corrosion Using Experiments and Simulation." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7564.

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Magnesium (Mg) is the lightest of all structural metals and has tremendous potential for applications in the lightweight industry. However, the corrosion of Mg is a significant barrier towards its wider use. Despite years of research, the fundamental understanding of Mg corrosion still remains short. The enhanced hydrogen evolution reaction (HER) with anodic polarization, the modeling of galvanic corrosion and the impact of hydrogen bubbles for galvanically coupled Mg are important aspects of Mg corrosion that need to be understood before any mitigation measures can be taken. The results prese

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22

Poudel, Amir. "Dissimilar Joining of Al (AA2139) – Mg (WE43) Alloys Using Friction Stir Welding." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc955064/.

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This research demonstrates the use of friction stir welding (FSW) to join dissimilar (Al-Mg) metal alloys. The main challenges in joining different, dissimilar metal alloys is the formation of brittle intermetallic compounds (IMCs) in the stir zone affecting mechanical properties of joint significantly. In this present study, FSW joining process is used to join aluminum alloy AA2139 and magnesium alloy WE43. The 9.5 mm thick plates of AA2139 and WE43 were friction stir butt welded. Different processing parameters were used to optimize processing parameters. Also, various weldings showed a crac

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23

Winkelman, Graham B. "Precipitation at dislocations in Al-Cu-Mg alloys." Monash University, School of Physics and Materials Engineering, 2003. http://arrow.monash.edu.au/hdl/1959.1/9581.

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24

Maisano, Adam J. "Cryomilling of Aluminum-based and Magnesium-based Metal Powders." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/31045.

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Ball milling has been shown to produce nanostructures in metal powders through severe repetitive deformation. Ball milling at cryogenic temperatures (cryomilling) is more effective in this capacity due to the low temperature by slowing recovery and minimizing diffusion distances between different components. Nanostructured metals are of interest because of their unique physical and mechanical properties. The result of cryomilling is powder consisting of crystallites on the order of 30 â 50 nm. In order to characterize the properties of this material, it is often necessary to consolidate

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25

Riddle, Yancy Willard. "Control of recrystallization in Al-Mg alloys using Sc and Zr." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/20127.

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26

彭澤厚 and Chak-hau Pang. "A study of Mg doping in GaN during molecular beam epitaxy." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31226619.

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27

Pang, Chak-hau. "A study of Mg doping in GaN during molecular beam epitaxy /." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25059075.

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28

Rizo, Pavel. "Mg/transition-metal nanomaterials for efficient hydrogen storage." Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC1050/document.

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Nanomatériaux à base de magnésium et de métaux de transition pour un stockage efficace de l'hydrogène. Le magnésium est un élément de choix pour le stockage de l’hydrogène à l’état solide en raison de sa grande abondance dans la croûte terrestre et de ses fortes capacités de sorption massique et volumétrique de l’hydrogène. Cependant, la réaction de sorption souffre d'une cinétique lente et l'hydrure formé est trop stable pour des applications fonctionnant sous conditions ambiantes. Le premier problème peut être résolu en développant des composites associant deux hydrures, MgH2 et TiH2, à l'éc

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29

Phasha, Maje Jacob. "Ab initio study of cohesive, electronic and elastic properties of ordered cubic-based Mg-Li alloys." Thesis, University of Limpopo (Turfloop Campus), 2005. http://hdl.handle.net/10386/890.

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Thesis (M.Sc. (Physics)) --University of Limpopo, 2005<br>Self-consistent electronic structure calculations have been performed on ordered cubic-based magnesium-lithium (Mgx-Li1−x) alloys spanning the concentration range 0 ≤ x ≤ 1, using an ab initio plane wave pseudopotential (PWP) method. The first principle pseudopotential planewave approach is used within the local density approximation (LDA) and generalized-gradient approximation (GGA)of the density functional theory (DFT) framework. We have calculated the binding energy curves and the systematic trends in various cohesive and elast

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30

Song, Young Wook. "Photoluminescence of InN with Mg and Zn Dopants." Thesis, University of Canterbury. Physics and Astronomy, 2008. http://hdl.handle.net/10092/1638.

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The optical properties of Mg-doped InN thin films grown on YSZ substrates have been investigated by photoluminescence (PL). A series of InN:Mg samples with various Mg cell temperatures (TMg) were produced by molecular beam epitaxy. The effect of Mg concentration on PL emission properties have been explored by various excitation power and temperature dependent measurements. The PL spectra as a function of excitation power exhibited a pronounce blueshift, indicating prominent band filling caused by the Burstein-Moss effect. Meanwhile, a typical redshift was observed as temperature increased due

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31

Cusick, Michael Christopher. "THE USE OF SELECTIVE ANNEALING FOR SUPERPLASTIC FORMING OF MG AZ31 ALLOY." UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_theses/492.

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A recent study on the Post-Formed properties of Superplastically Formed Magnesium AZ31B has shown that the heating time prior to testing has a major effect on the Post Forming properties of the superplastically material. To this point, there has been very little examination into the effect of pre-heating or annealing on superplastic forming (SPF) properties. In this work, the effects of annealing prior to the SPF of Mg AZ31 alloy were examined. Both high temperature SPF tensile and bulge specimens were formed after annealing. Multiple annealing temperatures were examined to produce specimens w

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32

Fach, Christina [Verfasser]. "Ruminal Magnesium Absorption: Mechanisms, Modulation and Meaning for Assessment of Mg Intake / Christina Fach." Berlin : Freie Universität Berlin, 2015. http://d-nb.info/1078017522/34.

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33

Liu, Yajun. "The kinetics of incongruent reduction between sapphire and Mg-Al melts." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/29401.

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Thesis (Ph.D)--Materials Science and Engineering, Georgia Institute of Technology, 2006.<br>Ken Sandhage - Committee Chair, Robert Snyder - Committee Co-Chair, G. Paul Neitzel - Committee Member, Preet Singh - Committee Member, Robert Speyer - Committee Member Part of the SMARTech Electronic Thesis and Dissertation Collection.

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34

Gharghouri, Michael. "Study of the mechanical properties of Mg-8.5wt%Al by in-situ neutron diffraction /." *McMaster only, 1996.

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35

Hlavnička, Radek. "Únavové vlastnosti ultrajemnozrnných Mg slitin." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231379.

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This thesis deals with the influence of grain refinement by ECAP on fatigue properties of magnesium alloy AZ 91. Tensile and fatigue tests were made on the as-cast state samples and samples after ECAP process. Metallographic analysis of the microstructure and fractographic analysis of the fracture surfaces was performed.

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Widman, Lars. "Skeletal muscle potassium and magnesium in diuretic treated patients : effects of potassium - sparing diuretics of magnesium supplementation." Doctoral thesis, Umeå universitet, Medicin, 1988. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-100556.

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37

Katsikis, Spyros. "Effect of copper and magnesium on the precipitation characteristics of Al-Li-Mg, Al-Li-Cu and Al-Li-Cu-Mg alloys." Thesis, University of Nottingham, 2001. http://eprints.nottingham.ac.uk/11664/.

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The effects of copper and magnesium on the precipitation characteristics of Al-Li-Mg, Al-Li- Cu, and Al-Li-Cu-Mg alloys have been investigated during isochronal and isothermal ageing. In AI-Li-Mg alloys, increasing the magnesium concentration results in stimulation of δ'precipitation by a shift of the α/δ'solvus boundary to higher temperatures. It was shown that for each wt%Mg present in the alloy the α/δ'solvus boundary shifts by 7.0°C. In Al-Li-Cu alloys the concentration of copper has no effect on the position of the α/δ'solvus boundary. The significant stimulation of δ' observed in Al-Li-C

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Seale, Geoff 1978. "Hot deformation mechanisms in Mg-x%Al-1%Zn-y%Mn alloys." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100233.

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Magnesium sheet for automotive applications is very attractive due to its light weight. The poor formability of magnesium and its alloys at room temperature, however, has limited the applications of these alloys. For this reason, at present, magnesium must be formed at elevated temperatures. This study investigates the hot deformation and fracture characteristics of Mg-1wt% Zn alloys containing a range of Al and Mn levels. Hot-rolled specimens were tensile tested over a range of strain rates and temperatures. Strain rate versus flow stress diagrams plotted on log-log scales revealed a transiti

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Mülazımoğlu, Mehmet Hașim. "Electrical conductivity studies of cast Al-Si and Al-Si-Mg alloys." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75785.

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Cast Al-Si and Al-Si-Mg alloys containing up to 12.6 wt. pct. silicon and 1.0 wt. pct. magnesium were prepared. The changes in electrical conductivity/resistivity of these alloys due to strontium additions have been investigated and explained in terms of variations in microstructure. The conductivity behaviour of strontium-containing and strontium-free alloys was found to exhibit marked differences, depending on the silicon and magnesium contents and the rate of solidification. The electrical conductivity of single phase alloys containing less than 1.60 wt. pct. Si decreased with increasing si

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Brescher, Roman. "Příprava objemových materiálů na bázi Mg-Al-Ti metodami práškové metalurgie." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2020. http://www.nusl.cz/ntk/nusl-433026.

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This diploma thesis deals with research and preparation of bulk materials based on the Mg–Al–Ti system. The theoretical part summarizes the basic knowledge about magnesium alloys, focusing mainly on Mg–Al and Mg–Ti systems. Furthermore, basic information on powder metallurgy methods was included here, from the production of powder materials, through their compaction, to heat treatment and spark plasma sintering (SPS). The theoretical part ends with literature review on the current research of the Mg–Al–Ti system. In the experimental part, bulk materials based on the Mg–Al–Ti system was prepare

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Sobola, Petr. "Únavová odolnost extrudované Mg-slitiny AZ91E." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231941.

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This thesis deals with fatigue behaviour of magnesium alloy AZ91E produced by extrusion. In the frame of this work, basic mechanical characteristics and data from performed fatigue tests were obtained. Further metallographic analysis of microstructure and fractographic analysis of broken specimens after fatigue tests were carried out.

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Štěpánek, Roman. "Teplotní stabilita Mg-slitiny AZ91 připravené pomocí intenzivní plastické deformace." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230220.

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This thesis dealt with thermal stability of magnesium alloy AZ91 prepared by severe plastic deformation, which leeds to fine grained structure. This structure is characterised by its inherent instability and this thesis tries to find out the value of critical temperature and rate of this instability, which manifests as grain coarsening.

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Tirkes, Suha. "Hot Cracking Susceptibility Of Twin Roll Cast Al-mg Alloys." Phd thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12611202/index.pdf.

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Increasing use of aluminum alloys in the automotive industry increases the importance of the production of sheet aluminum. To provide cost effective sheet aluminum to the industry, twin-roll casting (TRC) is becoming more important compared to DC casting. Demand for usage of different aluminum alloys in sheet form introduces some difficulties that should be considered during their applications. The main problem encountered during the welding of aluminum alloys is hot cracking. The aim of this study is to understand the difference in hot cracking susceptibility of two twin roll cast (TRC) alumi

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Al-Aqeeli, Naser. "Development of Al- and Mg-based nanocomposites via solid-state synthesis." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102948.

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Mechanical milling (alloying) is one of the non-equilibrium techniques used to prepare alloys with exceptional properties. This technique was employed in this research to develop a new class of Al- and Mg-based nanocomposite alloys using SPEX high energy milling. These nanocomposites are characterized by the dispersion of nanocrystals in an amorphous matrix. Zirconium was added to the Al-Mg alloys for the purpose of promoting glass formability. As-milled samples were annealed at 400°C for 1 hour to investigate the thermal stability of the nanostructure. The phase evolution of the resulting all

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Glass, Hugh. "Borate polyanion-based systems as Li- and Mg-ion cathode materials." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/264940.

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The aim of this thesis is to investigate pyroborates, M2B2O5, and orthoborates, M3(BO3)2, where M = Mg, Mn, Co, Ni, as high capacity and high voltage Li- and Mg-ion cathode materials. We explore the layered orthoborates (M3(BO3)2 which, to our knowledge, have not been previously considered as Li- or Mg-ion cathodes, perhaps due to the lack of Li analogues. Structural analysis shows that mixed metal orthoborates form a solid solution, with cation order driven by the presence of directional d orbitals. Electrochemical studies show that Mg can be removed from the structure and replaced with Li in

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Agarwal, Shirish. "Palladium/Magnesium Bimetallic Systems for Dechlorination of Polychlorinated Biphenyls." Cincinnati, Ohio : University of Cincinnati, 2009. http://www.ohiolink.edu/etd/view.cgi?acc_num=ucin1236037376.

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Thesis (Ph.D.)--University of Cincinnati, 2009.<br>Advisors: Dionysios Dionysiou (Committee Chair), Souhail Al-Abed (Committee Member), George Sorial (Committee Member), Margaret Kupferle (Committee Member). Title from electronic thesis title page (viewed April 22, 2009). Keywords: PCBs; Dechlorination; Pd/Mg; Bimetallic; Reduction pathway; intermediates; aggressive anions; sediment; nano-synthesis; nano-scaling; sulfide poisoning. Includes abstract. Includes bibliographical references.

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Kotek, Jakub. "Elektrochemické korozní charakteristiky Mg-Zn systémů připravených metodou práškové metalurgie." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2018. http://www.nusl.cz/ntk/nusl-376788.

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The diploma thesis deals with evaluation of electrochemical corrosion characteristics of Mg-Zn systems prepared by powder metallurgy in SBF solution. The main aim of the thesis is to analyze the influence of chemical composition, achieved structure and parameters of the process of production of Mg-Zn systems on their electrochemical corrosion characteristics. The basic electrochemical properties of the prepared materials will be evaluated by electrochemical impedance spectroscopy. In order to clarify the mechanism of corrosion of materials, the immersion tests will be used, accompanied by meta

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Madeddu, Silvia. "Alkaline-based extraction of Mg(OH)2 from magnesium silicate minerals for CO2 capture and storage." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/11429/.

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Magnesium hydroxide, Mg(OH)2, has great potential for CO2 capture and storage (CCS) as it can capture CO2 in aqueous and solid systems. However, the utilisation of Mg(OH)2 for CCS has been hindered due to its rare occurrence in mineral deposits, and Mg silicate minerals, despite their slow kinetics of carbonation, have been the prime focus of the investigations for CO2 sequestration owing to their abundance in nature. In the present study, the extraction of Mg(OH)2 from Mg silicate minerals was investigated in NaOH aqueous and solid systems. The effective extraction of Mg(OH)2 from Mg silicate

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DeVor, Robert. "DETERMINATION OF THE DEGRADATION MECHANISM FOR POLYCHLORINATED BIPHENYL CONGENERS USING MECHANICALLY ALLOYED MAGNESIUM/PALLADIUM." Doctoral diss., University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2856.

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Polychlorinated biphenyls are a ubiquitous environmental contaminant that can be found today throughout the world in soils and sediments, lakes and rivers, and flora and fauna. PCBs have percolated throughout the food chain, so that almost every human being has a detectable amount of the contaminant within their blood stream. Existing remediation methods include incineration, dredging and landfilling, and microbial degradation, but all of these methods have drawbacks that limit their effectiveness as treatment options. Recently, the use of zero-valent metals as a means of reductive dechlorinat

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Cakmak, Gulhan. "The Processing Of Mg-ti Powder For Hydrogen Storage." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613102/index.pdf.

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A study was carried out on the selection of processing condition that would yield Mg-Ti with most favourable hydrogenation properties. Processing routes under consideration were<br>mechanical milling under inert atmosphere, reactive milling i.e. milling under hydrogen atmosphere, ECAP (equal channel angular pressing) and thermal plasma synthesis. Structure resulting from each of these processing routes was characterized with respect to size reduction, coherently diffracting volume and the distribution of Ti catalyst. Mechanical milling yielded a particulate structure made up of large Mg agglom

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