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Compounds with Polar Metallic Bonding

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ISBN: 9783039210701 / 9783039210718 Year: Pages: 154 DOI: 10.3390/books978-3-03921-071-8 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Chemistry (General) --- Inorganic Chemistry
Added to DOAB on : 2019-08-28 11:21:27
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The Special Edition 'Compounds with Polar Metallic Bonding' is a collection of eight original research reports presenting a broad variety of chemical systems, analytical methods, preparative pathways and theoretical descriptions of bonding situations, with the common aim of understanding the complex interplay of conduction electrons in intermetallic compounds that possess different types of dipoles. Coulombic dipoles introduced by electronegativity differences, electric or magnetic dipoles, polarity induced by symmetry reduction—all the possible facets of the term 'polarity'—can be observed in polar intermetallic phases and have their own and, in most cases, unique consequences on the physical and chemical behaviour. Elucidation of the structure–property relationships in compounds with polar metallic bonding is a modern and growing scientific field which combines solid state physics, preparative chemistry, metallurgy, modern analytic methods, crystallography, theoretical calculations of the electronic state and many more disciplines.

Friction Stir Welding and Processing in Alloy Manufacturing

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ISBN: 9783039212071 / 9783039212088 Year: Pages: 142 DOI: 10.3390/books978-3-03921-208-8 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Chemistry (General) --- Analytical Chemistry
Added to DOAB on : 2019-12-09 11:49:15
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Friction stir welding (FSW) is considered to be the most significant development in metal joining in decades and, in addition, is a ""green"" technology due to its energy efficiency, environmental friendliness, and versatility. This process offers a number of advantages over conventional joining processes. Furthermore, because welding occurs via the deformation of material at temperatures below the melting temperature, many problems commonly associated with joining of dissimilar alloys can be avoided, and thus, high-quality welds are produced. Due to this fact, FSW has been widely used in different industrial applications where metallurgical characteristics should be retained, such as in the aeronautic, naval, and automotive industries.

Coordination Chemistry of Silicon

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ISBN: 9783038976387 Year: Pages: 225 DOI: 10.3390/books978-3-03897-639-4 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Chemistry (General) --- Inorganic Chemistry
Added to DOAB on : 2019-03-08 11:42:05
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The chemistry of silicon has always been a field of major concern due to its proximity to carbon on the periodic table. From the molecular chemist's viewpoint, one of the most interesting differences between carbon and silicon is their divergent coordination behavior. In fact, silicon is prone to form hyper-coordinate organosilicon complexes, and, as conveyed by reports in the literature, highly sophisticated ligand systems are required to furnish low-coordinate organosilicon complexes. Tremendous progress in experimental, as well as computational, techniques has granted synthetic access to a broad range of coordination numbers for silicon, and the scientific endeavor, which was ongoing for decades, was rewarded with landmark discoveries in the field of organosilicon chemistry. Molecular congeners of silicon(0), as well as silicon oxides, were unveiled, and the prominent group 14 metalloid proved its applicability in homogenous catalysis as a supportive ligand or even as a center of catalytic activity. This book focuses on the most recent advances in the coordination chemistry of silicon with transition metals as well as main group elements, including the stabilization of low-valent silicon species through the coordination of electron donor ligands. Therefore, this book is associated with the development of novel synthetic methodologies, structural elucidations, bonding analysis, and also possible applications in catalysis or chemical transformations using related organosilicon compounds.

Keywords

silanetriols --- disiloxane tetrols --- silsesquioxanes --- condensation --- molecular cage --- platinum --- primary silane --- hydrido complex --- oxidative addition --- ligand-exchange reaction --- X-ray crystallography --- Si–Cl activation --- germylene --- digermene --- digermacyclobutadiene --- palladium --- cluster --- cyclic organopolysilane --- template --- bridging silylene ligand --- isocyanide --- hydrogen bonds --- silicon --- 2-silylpyrrolidines --- stereochemistry --- X-ray crystallography --- Baird’s rule --- computational chemistry --- excited state aromaticity --- Photostability --- dye-sensitized solar cell --- disilanylene polymer --- photoreaction --- surface modification --- TiO2 --- silylene --- germylene --- N-heterocyclic carbene --- oxidative addition --- siloxanes --- host-guest chemistry --- supramolecular chemistry --- main group coordination chemistry --- hydrogen bonding --- adsorption --- bond activation --- bonding analysis --- density functional theory --- distorted coordination --- molecular orbital analysis --- silicon surfaces --- disilene --- functionalization --- ?-electron systems --- silicon --- N-heterocyclic carbenes --- bromosilylenes --- silyliumylidenes --- dehydrobromination --- silicon cluster --- siliconoid --- nanoparticle --- computation --- silicon --- N-heterocyclic carbenes --- silyliumylidenes --- small molecule activation --- mechanistic insights --- organosilicon --- reductant --- N-Heterocyclic tetrylene --- salt-free --- germanium --- germanethione --- germathioacid chloride --- N-heterocyclic carbines --- ?-chloro-?-hydrooligosilane --- titanium --- ruthenium --- dehydrogenative alkoxylation --- cluster --- isomerization --- silicon --- siliconoid --- subvalent compounds --- AIM --- DFT --- intermetallic bond --- 29Si NMR spectroscopy --- X-ray diffraction

Processing-Structure-Property Relationships in Metals

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ISBN: 9783039217700 / 9783039217717 Year: Pages: 240 DOI: 10.3390/books978-3-03921-771-7 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2019-12-09 16:39:37
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In the industrial manufacturing of metals, the achievement of products featuring desired characteristics always requires the control of process parameters in order to obtain a suitable microstructure. The strict relationship among process parameters, microstructure, and mechanical properties is a matter of interest in different areas, such as foundry, plastic forming, sintering, welding, etc., and regards both well-established and innovative processes. Nowadays, circular economy and sustainable technological development are dominant paradigms and impose an optimized use of resources, a lower energetic impact of industrial processes and new tasks for materials and products. In this frame, this Special Issue covers a broad range of research works and contains research and review papers.

Keywords

titanium composites --- in situ secondary phases --- microstructure --- inductive hot pressing --- intermetallic --- bainite rail --- tempering --- retained austenite --- tensile property --- impact toughness --- cryorolling --- reduction --- ultrafine grain --- secondary recrystallization --- high strength --- microstructure inhomogeneity --- non-monotonic simple shear strains --- shear strain reversal --- severe plastic deformation --- texture inhomogeneity --- tensile properties --- Mg-10Y-6Gd-1.5Zn-0.5Zr --- ultra-fine grain --- aging treatment --- precipitation behavior --- mechanical property --- multimodal --- AZ91 alloy --- equal channel angular pressing --- aging --- high pressure die casting --- aluminum alloy --- prediction model --- process monitoring --- static mechanical behavior --- fracture surface --- microstructure. --- casting --- Al 6061 alloys --- shrinkage --- porosity --- steering knuckles --- Al alloys --- warm working --- mechanical properties --- dental materials --- metal posts --- computer-aided design (CAD) --- image analysis --- mechanical properties --- finite element analysis --- additive manufacturing --- Al alloys --- wear --- cavitation erosion --- SEM --- microstructure --- high speed steel --- nanostructured coatings --- thin films --- FEGSEM --- tribology --- Nb tube --- caliber-rolling --- grain boundaries --- texture --- electron backscatter diffraction --- damping --- aluminum film --- grain boundary --- anelasticity --- thin aluminum sheet --- alloys --- aeronautic applications --- mechanical properties --- corrosion resistance --- EBM --- SEBM --- macro-instrumented indentation test --- property-microstructure-process relationship --- mechanical properties --- indentation hardness --- indentation modulus --- tensile properties --- Ti-6Al-4V alloy --- ?-platelet thickness --- columnar microstructure --- n/a

Dissimilar Metal Welding

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ISBN: 9783039219544 / 9783039219551 Year: Pages: 288 DOI: 10.3390/books978-3-03921-955-1 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2020-01-07 09:08:26
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The combination of distinct materials is a key issue in modern industry, whereas the driving concept is to design parts with the right material in the right place. In this framework, a great deal of attention is directed towards dissimilar welding and joining technologies. In the automotive sector, for instance, the concept of “tailored blanks”, introduced in the last decade, has further highlighted the necessity to weld dissimilar materials. As far as the aeronautic field is concerned, most structures are built combining very different materials and alloys, in order to match lightweight and structural performance requirements. In this framework, the application of fusion welding techniques, namely, tungsten inert gas or laser welding, is quite challenging due to the difference in physical properties, in particular the melting point, between adjoining materials. On the other hand, solid-state welding methods, such as the friction stir welding as well as linear friction welding processes, have already proved to be capable of manufacturing sound Al-Cu, Al-Ti, Al-SS, and Al-Mg joints, to cite but a few. Recently, promising results have also been obtained using hybrid methods. Considering the novelty of the topic, many relevant issues are still open, and many research groups are continuously publishing valuable results. The aim of this book is to finalize the latest contributions on this topic.

Keywords

dissimilar joints --- friction stir welding --- microstructure --- mechanical properties --- local strength mismatch --- dissimilar metal welded joint --- fracture resistance --- crack growth path --- optimal design --- laser beam welding --- spatial beam oscillation --- dissimilar metals --- aluminum --- copper --- friction stir welding --- aluminum --- copper --- cross-section adjustment --- mechanical properties --- electrical properties --- dissimilar weld --- ageing --- tensile properties --- hardness --- failure mode --- dissimilar metal welding --- Inconel 625 --- AISI 316L --- microstructure --- filler metals --- friction stir spot welding --- friction stir spot brazing --- joining area --- fracture load --- Al/steel dissimilar materials --- friction stir welding --- interface --- intermetallic compounds --- dual-beam laser welding --- steel/Al joint --- side-by-side configuration --- tensile resistance --- EBSD phase mapping --- pulsed Nd:YAG laser beam welding --- interfacial crack initiation --- dissimilar Ti6Al4V/AA6060 lap joint --- phase potential --- laser welding --- pulsed Nd:YAG laser --- DP1000 steel --- 1050 aluminum alloy --- dissimilar materials welding --- steel/aluminum joint --- Ag-Cu-Zn --- Rare earth --- aging treatment --- microstructure --- mechanical properties --- aluminum --- dissimilar --- friction stir welding --- FSW --- hardness --- microstructure --- tensile --- magnetic pulse welding --- dissimilar metal welding --- solid state welding --- welding window --- cloud of particles --- jet --- surface activation --- welding-brazing --- arc assisted laser method --- aluminum-steel butt joint --- mechanical properties --- DeltaSpot welding --- spooling process tape --- aluminum alloy --- dissimilar metal welding --- lobe curve --- electromagnetic pulse welding --- tubular joints --- internal supports --- n/a

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