Thematische Bibliographien / Complex Concentrated Alloys

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Auswahl der wissenschaftlichen Literatur zum Thema „Complex Concentrated Alloys“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 28. Januar 2023

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Zeitschriftenartikel zum Thema "Complex Concentrated Alloys"

Gorsse, Stéphane, Jean-Philippe Couzinié und Daniel B. Miracle. „From high-entropy alloys to complex concentrated alloys“. Comptes Rendus Physique 19, Nr. 8 (Dezember 2018): 721–36. http://dx.doi.org/10.1016/j.crhy.2018.09.004.

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Mukherjee, Sundeep. „Complex Concentrated Alloys (CCAs)—Current Understanding and Future Opportunities“. Metals 10, Nr. 9 (17.09.2020): 1253. http://dx.doi.org/10.3390/met10091253.

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Complex concentrated alloys with multiple principal elements represent a new paradigm in alloy design by focusing on the central region of a multi-component phase space and show a promising range of properties unachievable in conventional alloys [...]

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Muskeri, Saideep, Phillip A. Jannotti, Brian E. Schuster, Jeffrey T. Lloyd und Sundeep Mukherjee. „Ballistic impact response of complex concentrated alloys“. International Journal of Impact Engineering 161 (März 2022): 104091. http://dx.doi.org/10.1016/j.ijimpeng.2021.104091.

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Gorsse, Stéphane, Daniel B. Miracle und Oleg N. Senkov. „Mapping the world of complex concentrated alloys“. Acta Materialia 135 (August 2017): 177–87. http://dx.doi.org/10.1016/j.actamat.2017.06.027.

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Badea, Ioana-Cristina, Ioana Csaki, Beatrice-Adriana Serban, Nicolae Constantin, Dumitru Mitrica, Marian Burada, Ioana Anasiei, Mihai Tudor Olaru, Andreea-Nicoleta Ghita und Ana-Maria Julieta Popescu. „Characterisation of a Novel Complex Concentrated Alloy for Marine Applications“. Materials 15, Nr. 9 (06.05.2022): 3345. http://dx.doi.org/10.3390/ma15093345.

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Complex concentrated alloys (CCAs) are a new family of materials with near equimolar compositions that fluctuate depending on the characteristics and destination of the material. CCAs expand the compositional limits of the traditional alloys, displaying new pathways in material design. A novel light density Al5Cu0.5Si0.2Zn1.5Mg0.2 alloy was studied to determine the structural particularities and related properties. The alloy was prepared in an induction furnace and then annealed under a protective atmosphere. The resulted specimens were analysed by chemical, structural, mechanical, and corrosion resistance. The structural analyses revealed a predominant FCC and BCC solid solution structure. The alloy produced a compression strength of 500–600 MPa, comparable with conventional aluminium alloys. The corrosion resistance in 3.5% NaCl solution was 0.3424 mm/year for as-cast and 0.1972 mm/year for heat-treated alloy, superior to steel, making the alloy a good candidate for marine applications.

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Wu, Junxia, Peiyou Li, Hongfeng Dong, Yuefei Jia, Yaling Liu, Wei Zhang und Mina Zhang. „Composition design, microstructure, and mechanical properties of novel Ti–Co–Ni–Zr complex concentrated alloys“. International Journal of Materials Research 112, Nr. 11 (01.11.2021): 880–89. http://dx.doi.org/10.1515/ijmr-2021-8196.

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Abstract The composition design of complex concentrated alloys originates from the composition design of amorphous alloys. To expand the composition design of alloys, herein, the compositions of novel Ti–Co–Ni–Zr complex concentrated alloys were obtained by the proportional mixing of Ti2Co intermetallics and Ni64Zr36 binary eutectic. The theory and method of this new alloy design are also discussed. The as-cast Ti28Co14Ni37.12Zr20.88, Ti30Co15Ni35.2Zr19.8, and Ti32 . Co16Ni33.3Zr18.7 alloys were composed of body-centered cubic TiNi and Ti2Ni phases. The Ti28Co14Ni37.12Zr20.88 alloy exhibited high yield strength (2 164 MPa) and compressive strength (2 539 MPa) under quasi-static compression at roomtemperature. The high strength of Ti28Co14Ni37.12Zr20.88 alloy is related to the precipitation of Ti2Ni along the grain boundary and the precipitation in the crystal. This paper validates that using the proportional mixing method of intermetallics and eutectic alloy is an effective method to design complex concentrated alloys with high strength.

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Senkov, O. N., S. Gorsse und D. B. Miracle. „High temperature strength of refractory complex concentrated alloys“. Acta Materialia 175 (August 2019): 394–405. http://dx.doi.org/10.1016/j.actamat.2019.06.032.

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Stepanov, Nikita, und Sergey Zherebtsov. „Design of High-Entropy Alloys“. Metals 12, Nr. 6 (11.06.2022): 1003. http://dx.doi.org/10.3390/met12061003.

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Ayyagari, Aditya, Vahid Hasannaeimi, Harpreet Grewal, Harpreet Arora und Sundeep Mukherjee. „Corrosion, Erosion and Wear Behavior of Complex Concentrated Alloys: A Review“. Metals 8, Nr. 8 (03.08.2018): 603. http://dx.doi.org/10.3390/met8080603.

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There has been tremendous interest in recent years in a new class of multi-component metallic alloys that are referred to as high entropy alloys, or more generally, as complex concentrated alloys. These multi-principal element alloys represent a new paradigm in structural material design, where numerous desirable attributes are achieved simultaneously from multiple elements in equimolar (or near equimolar) proportions. While there are several review articles on alloy development, microstructure, mechanical behavior, and other bulk properties of these alloys, then there is a pressing need for an overview that is focused on their surface properties and surface degradation mechanisms. In this paper, we present a comprehensive view on corrosion, erosion and wear behavior of complex concentrated alloys. The effect of alloying elements, microstructure, and processing methods on the surface degradation behavior are analyzed and discussed in detail. We identify critical knowledge gaps in individual reports and highlight the underlying mechanisms and synergy between the different degradation routes.

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Li, Mu, Zhaohan Zhang, Arashdeep S. Thind, Guodong Ren, Rohan Mishra und Katharine M. Flores. „Microstructure and properties of NbVZr refractory complex concentrated alloys“. Acta Materialia 213 (Juli 2021): 116919. http://dx.doi.org/10.1016/j.actamat.2021.116919.

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Dissertationen zum Thema "Complex Concentrated Alloys"

Komarasamy, Mageshwari. „Deformation Micro-mechanisms of Simple and Complex Concentrated FCC Alloys“. Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc822829/.

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The principal objective of this work was to elucidate the effect of microstructural features on the intrinsic dislocation mechanisms in two FCC alloys. First alloy Al0.1CoCrFeNi was from a new class of material known as complex concentrated alloys, particularly high entropy alloys (HEA). The second was a conventional Al-Mg-Sc alloy in ultrafine-grained (UFG) condition. In the case of HEA, the lattice possess significant lattice strain due to the atomic size variation and cohesive energy differences. Moreover, both the lattice friction stress and the Peierls barrier height are significantly larger than the conventional FCC metals and alloys. The experimental evidences, so far, provide a distinctive identity to the nature and motion of dislocations in FCC HEA as compared to the conventional FCC metals and alloys. Hence, the thermally activated dislocation mechanisms and kinetics in HEA has been studied in detail. To achieve the aim of examining the dislocation kinetics, transient tests, both strain rate jump tests and stress relaxation tests, were conducted. Anomalous behavior in dislocation kinetics was observed. Surprisingly, a large rate sensitivity of the flow stress and low activation volume of dislocations were observed, which are unparalleled as compared to conventional CG FCC metals and alloys. The observed trend has been explained in terms of the lattice distortion and dislocation energy framework. As opposed to the constant dislocation line energy and Peierls potential energy (amplitude, ΔE) in conventional metals and alloys, both line energy and Peierls potential undergo continuous variation in the case of HEA. These energy fluctuations have greatly affected the dislocation mobility and can be distinctly noted from the activation volume of dislocations. The proposed hypothesis was tested by varying the grain size and also the test temperature. Activation volume of dislocations was a strong function of temperature and increased with temperature. And the reduction in grain size did not affect the dislocation mechanisms and kinetics. This further bolstered the hypothesis. The second part deals with deformation characteristics of Al-Mg-Sc alloy. The microstructure obtained from the severe plastic deformation (SPD) techniques differ in dislocation density, grain/cell size, and in the grain boundary character distribution. Therefore, it is vital to understand the deformation behavior of the UFG materials produced by various SPD techniques, as the microstructural features basically control the deformation mechanisms. In this study, a detailed analysis was made to understand the deformation mechanisms operative in various regimes of a stress-strain in UFG Al-Mg-Sc alloy produced via friction stir processing. The stress-strain curves exhibited serrations from the onset of yielding to the point of sample failure. The serration amplitude and frequency was higher in UFG material as compared to CG material. Furthermore, the microstructural features that result in the serrated flow were investigated along with the avalanche characteristics. The presence of both ultrafine grains and Al3Sc precipitates were the necessary conditions to reach the critical stress required to push the grain boundary into a critical state to set off an avalanche. The microstructural conditions that did not satisfy both the requirements did not exhibit deep serrations.

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Moravčíková, de Almeida Gouvea Larissa. „Metal Matrix Composites Prepared by Powder Metallurgy Route“. Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-445180.

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Vývoj nových materiálů pro součásti v moderních technologiích vystavené extrémním podmínkám má v současné době rostoucí význam. Děje se tak v důsledku neustále se zvyšujících požadavků průmyslových odvětví na lepší konstrukční vlastnosti nosných materiálů. Ve světle těchto faktů si tato studie klade za cíl posoudit nové složení slitin s vysokou entropií, které se vyznačují vysokým aplikačním potenciálem pro kritické aplikace. Slitiny jsou připravovány práškovou metalurgií, t.j. kombinací mechanického legování a slinování v pevné fázi. Pro účely srovnávaní vlastností jsou vybrané kompozice vyrobeny také tradičními metalurgickými metodami v roztaveném stavu, jako je vakuové indukční tavení a následné lití nebo vakuové obloukové tavení. Prášková metalurgie umožňuje postupný vývoj kompozitů s kovovou matricí (MMC) prostřednictvím přípravy oxidicky zpevněných HEA slitin. To je možné díky inherentním in-situ reakcím během procesu výroby. Když se naopak zvolí výrobní postup z taveniny, připravený kovový materiál vykazuje velké rozdíly v mikrostrukturách a souvisejících vlastnostech, v porovnání se stejným materiálem vyrobeným práškovou cestou (PM). Vyrobené práškové a tavené materiály jsou detailně charakterizovány s ohledem na komplexní vyhodnocení vlivu různých metod zpracování. Práce se zejména orientuje na mikrostrukturní charakteristiky materiálů a jejich mechanické vlastnosti, včetně vlivu tepelného zpracování na fázové transformaci a mikrostrukturní stabilitu připravených materiálů.

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Mikler, Calvin. „Laser Additive Manufacturing of Magnetic Materials“. Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1011873/.

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A matrix of variably processed Fe-30at%Ni was deposited with variations in laser travel speeds as well and laser powers. A complete shift in phase stability occurred as a function of varying laser travel speed. At slow travel speeds, the microstructure was dominated by a columnar fcc phase. Intermediate travel speeds yielded a mixed microstructure comprised of both the columnar fcc and a martensite-like bcc phase. At the fastest travel speed, the microstructure was dominated by the bcc phase. This shift in phase stability subsequently affected the magnetic properties, specifically saturation magnetization. Ni-Fe-Mo and Ni-Fe-V permalloys were deposited from an elemental blend of powders as well. Both systems exhibited featureless microstructures dominated by an fcc phase. Magnetic measurements yielded saturation magnetizations on par with conventionally processed permalloys, however coercivities were significantly larger; this difference is attributed to microstructural defects that occur during the additive manufacturing process.

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Bücher zum Thema "Complex Concentrated Alloys"

Complex Concentrated Alloys (CCAs). MDPI, 2020. http://dx.doi.org/10.3390/books978-3-03943-475-6.

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Hazzard, Oli. Introduction. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198822011.003.0001.

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This is an account of John Ashbery’s career in which, as he puts it in ‘Grand Galop’, the ‘minor eras / Take on an importance all out of proportion to the story’.1 The ‘minority’ of any part of any story is, of course, a relational status always open to dispute, but in the available narratives of Ashbery’s life and work his personal and textual engagements with contemporaneous English poets have, up to this point, occupied a certifiably marginal position. This is unsurprising. When compared with the most ambitious, compelling narratives of Ashbery’s place within literary history—portraying him as a late Romantic, a Francophile avant-gardist, or a coterie poet of the New York School, among many other possible identities—concentrating on his English connections might seem a limited perspective from which to view his work. Yet because the idea of ‘minority’ was a central preoccupation for Ashbery throughout his career, it is apt to discover that many of the important, enduring points of interest which occupied his poetry and poetics—the relation of the margin to the centre, the ways in which art represents the historical moment of its composition, the processes by which canons are formed, the methods through which aesthetic ‘strength’ and ‘weakness’ are determined, the connection between national identities and traditions and individual poetic expression—are foregrounded and illuminated when raised within such a ‘minor’ context. The limitation of scope in this study—which attends to Ashbery’s relationships with W. H. Auden, F. T. Prince, Lee Harwood and Mark Ford—allows for a localized, concentrated sample of his writing to be attended to, and obliquely to substantiate or complicate our understanding of more general themes or practices in his oeuvre. Ashbery’s body of work is broad and varied enough to justify its fragmentation into specific sub-categories, which in combination will allow for a larger, more comprehensive and more complex picture of this inexhaustible poet to be presented. This book hopes to make three central contributions to that broader picture: to demonstrate the significance of Anglo-American contexts to Ashbery’s work, to illustrate his importance ...

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McKendrick, Ewan. Contract Law. Oxford University Press, 2020. http://dx.doi.org/10.1093/he/9780198855293.001.0001.

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Contract Law: Text, Cases, and Materials provides a complete guide to the subject of contract law. The book comprises a balance of 60% text to 40% cases and materials. Its clear explanations and analyses of the law provide support to students, while the extracts from cases and materials promote the development of essential case reading skills and allow for a more detailed appreciation of the practical workings of the law and of the best legal scholarship. Part I of the book examines the rules relating to the existence of an agreement (particularly offer and acceptance, uncertain and incomplete agreements, and consideration and promissory estoppel). Part II covers the terms of the contract, including implied terms, interpretation, boilerplate clauses, exclusion clauses, unfair terms in consumer contracts, and good faith. Part III examines topics such as mistake, misrepresentation, duress, undue influence, unconscionability, inequality of bargaining power, and frustration and force majeure. Part IV turns to breaches of contract and termination, damages, and specific performance. The last part, Part V, concentrates on third parties.

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McKendrick, Ewan. Contract Law. 10. Aufl. Oxford University Press, 2022. http://dx.doi.org/10.1093/he/9780192856548.001.0001.

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Contract Law: Text, Cases, and Materials provides a complete guide to the subject of contract law. The book comprises a balance of 60 per cent text to 40 per cent cases and materials. Its clear explanations and analyses of the law provide support to students, while the extracts from cases and materials promote the development of essential case reading skills and allow for a more detailed appreciation of the practical workings of the law and of the best legal scholarship. Part I of the book examines the rules relating to the existence of an agreement (particularly offer and acceptance, uncertain and incomplete agreements, and consideration and promissory estoppel). Part II covers the terms of the contract, including implied terms, interpretation, boilerplate clauses, exclusion clauses, unfair terms in consumer contracts, and good faith. Part III examines topics such as mistake, misrepresentation, duress, undue influence, unconscionability, inequality of bargaining power, and frustration and force majeure. Part IV turns to breaches of contract and termination, damages, and specific performance. The last part, Part V, concentrates on third parties.

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McKendrick, Ewan. Contract Law. Oxford University Press, 2018. http://dx.doi.org/10.1093/he/9780198808169.001.0001.

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Contract Law: Text, Cases, and Materials provides a complete guide to the subject of contract law. The book comprises a balance of 40% text to 60% cases and materials. Its clear explanations and analyses of the law provide support to students, while the extracts from cases and materials promote the development of essential case reading skills and allow for a more detailed appreciation of the practical workings of the law and of the best legal scholarship. Part I of the book examines the rules relating to the existence of an agreement (particularly offer and acceptance, uncertain and incomplete agreements, and consideration and promissory estoppel). Part II covers the terms of the contract, including implied terms, interpretation, boilerplate clauses, exclusion clauses, unfair terms in consumer contracts, and good faith. Part III examines topics such as mistake, misrepresentation, duress, undue influence, unconscionability, inequality of bargaining power, and frustration and force majeure. Part IV turns to breaches of contract and termination, damages, and specific performance. The last part, Part V, concentrates on third parties.

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Capmany, José, und Daniel Pérez. Programmable Integrated Photonics. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198844402.001.0001.

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Programmable Integrated Photonics (PIP) is a new paradigm that aims at designing common integrated optical hardware configurations, which by suitable programming can implement a variety of functionalities that, in turn, can be exploited as basic operations in many application fields. Programmability enables by means of external control signals both chip reconfiguration for multifunction operation as well as chip stabilization against non-ideal operation due to fluctuations in environmental conditions and fabrication errors. Programming also allows activating parts of the chip, which are not essential for the implementation of a given functionality but can be of help in reducing noise levels through the diversion of undesired reflections. After some years where the Application Specific Photonic Integrated Circuit (ASPIC) paradigm has completely dominated the field of integrated optics, there is an increasing interest in PIP justified by the surge of a number of emerging applications that are and will be calling for true flexibility, reconfigurability as well as low-cost, compact and low-power consuming devices. This book aims to provide a comprehensive introduction to this emergent field covering aspects that range from the basic aspects of technologies and building photonic component blocks to the design alternatives and principles of complex programmable photonics circuits, their limiting factors, techniques for characterization and performance monitoring/control and their salient applications both in the classical as well as in the quantum information fields. The book concentrates and focuses mainly on the distinctive features of programmable photonics as compared to more traditional ASPIC approaches.

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Buchteile zum Thema "Complex Concentrated Alloys"

Kumar, Jitesh, Saumya R. Jha, N. P. Gurao und Krishanu Biswas. „An Odyssey from High Entropy Alloys to Complex Concentrated Alloys“. In New Horizons in Metallurgy, Materials and Manufacturing, 159–80. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-5570-9_10.

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Rentz, Niklas, Steven Smyth, Lewe Andersen und Reinhard von Hanxleden. „Extracting Interactive Actor-Based Dataflow Models from Legacy C Code“. In Diagrammatic Representation and Inference, 361–77. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-86062-2_37.

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AbstractGraphical actor-based models provide an abstract overview of the flow of data in a system. They are well-established for the model-driven engineering (MDE) of complex software systems and are supported by numerous commercial and academic tools, such as Simulink, LabVIEW or Ptolemy. In MDE, engineers concentrate on constructing and simulating such models, before application code (or at least a large fraction thereof) is synthesized automatically. However, a significant fraction of today’s legacy system has been coded directly, often using the C language. High-level models that give a quick, accurate overview of how components interact are often out of date or do not exist. This makes it challenging to maintain or extend legacy software, in particular for new team members.To address this problem, we here propose to reverse the classic synthesis path of MDE and to synthesize actor-based dataflow models automatically from source code. Here functions in the code get synthesized into nodes that represent actors manipulating data. Second, we propose to harness the modeling-pragmatic approach, which considers visual models not as static artefacts, but allows interactive, flexible views that also link back to textual descriptions. Thus we propose to synthesize actor models that can vary in level of detail and that allow navigation in the source code. To validate and evaluate our proposals, we implemented these concepts for C analysis in the open source, Eclipse-based KIELER project and conducted a small survey.

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Sankaran, Krishnan K., und Rajiv S. Mishra. „Complex Concentrated Alloys Including High Entropy Alloys“. In Metallurgy and Design of Alloys with Hierarchical Microstructures, 385–405. Elsevier, 2017. http://dx.doi.org/10.1016/b978-0-12-812068-2.00008-4.

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Klenam, Desmond, Nima Rahbar und Wole Soboyejo. „Critical Review of Factors Hindering Scalability of Complex Concentrated Alloys“. In Reference Module in Materials Science and Materials Engineering. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-822944-6.00051-7.

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Klenam, Desmond, Nima Rahbar und Wole Soboyejo. „Mechanical Properties of Complex Concentrated Alloys: Implications for Structural Integrity“. In Reference Module in Materials Science and Materials Engineering. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-822944-6.00047-5.

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Klenam, Desmond E. P., Gaston Egowan, Michael O. Bodunrin, Josias W. van der Merwe, Nima Rahbar und Winston Soboyejo. „Complex Concentrated Alloys: A Cornucopia of Possible Structural and Functional Applications“. In Reference Module in Materials Science and Materials Engineering. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-822944-6.00056-6.

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Sharma, Prince, Nushrat Naushin, Sahil Rohila und Abhishek Tiwari. „Magnesium containing High Entropy Alloys“. In Magnesium Alloys Structure and Properties [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98557.

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High Entropy alloys (HEAs) or Complex Concentrated Alloys (CCAs) or Multi-Principal Element Alloys (MPEAs) is a matter of interest to material scientists for the last two decades due to the excellent mechanical properties, oxidation and corrosion resistant behaviors. One of the major drawbacks of HEAs is their high density. Mg containing HEAs show low density compared to peers, although extensive research is required in this field. This chapter aims to include all the available information on synthesis, design, microstructures and mechanical properties of Mg containing HEAs and to highlight the contemporary voids that are to be filled in near future.

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Klenam, Desmond, Nima Rahbar und Wole Soboyejo. „Critical Review of Limitations of Equiatomic Composition Alloying Strategy of Complex Concentrated Alloys“. In Reference Module in Materials Science and Materials Engineering. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-822944-6.00055-4.

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Kublanovsky, Valeriy S., Oksana L. Bersirova, Yulia S. Yapontseva, Tetyana V. Maltseva, Vasyl M. Nikitenko, Eugen A. Babenkov, Sergei V. Devyatkin et al. „Electrochemical synthesis of nanostructured super-alloys with valuable electrochemical, electrocatalytic and corrosion properties“. In NEW FUNCTIONAL SUBSTANCES AND MATERIALS FOR CHEMICAL ENGINEERING, 130–45. PH “Akademperiodyka”, 2021. http://dx.doi.org/10.15407/akademperiodyka.444.130.

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A study of the electrochemical formation of functional coatings by binary and ternary alloys M1M2, M1M3, M1M2M3 (where M1 is 3d6-8 metal of the iron subgroup: Fe, Co, Ni, and M2 is Mo, W; M3 is Re), from complex aqueous solutions and ionic melts. Such alloys are called "superalloys" due to a wide range of valuable physicochemical (corrosive, electrocatalytic) and functional properties and are designed to operate in extreme temperature and power modes with simultaneous exposure to an aggressive environment. The presence of rhenium in the alloy also simultaneously increases its strength and ductility (the so-called "rhenium effect"). A fundamentally new electrolyte (highly concentrated ammonia-acetate) has been developed for the formation of molybdenum alloys (NiMo, CoMo, FeMo) with a maximum content of a refractory component (about 85 at.%), such as those that exhibit a high electrocatalytic effect in the hydrogen evolution reaction (HER). The deposition of binary CoRe and ternary CoWRe alloys from a citrate electrolyte was carried out. The influence of the composition of solutions and electrolysis parameters on the chemical and phase composition, structure and properties of coatings has been established. The parameters of pulse electrolysis for obtaining multilayer CoMo and CoW coatings from carbamide melts containing cobalt and molybdenum / tungsten oxides have been determined.

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Halmann, Martin, Aldo Steinfeld, Michael Epstein und Irina Vishnevetsky. „Vacuum Carbothermic Reduction of Alumina“. In Encyclopedia of Aluminum and Its Alloys. Boca Raton: CRC Press, 2019. http://dx.doi.org/10.1201/9781351045636-140000448.

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The current industrial production of aluminum from alumina is based on the electrochemical Hall-Héroult process, which has the drawbacks of high-greenhouse gas emissions, reaching up to 0.70 kg CO2-equiv/kg Al, and large energy consumption, about 0.055 GJ/kg Al. An alternative process is the carbothermic reduction of alumina. Thermodynamic equilibrium calculations and experiments by induction furnace heating indicated that this reaction could be achieved under atmospheric pressure only above 2200° C. Lower required reaction temperatures can be achieved by alumina reduction under vacuum. This was experimentally demonstrated under simulated concentrated solar illumination and by induction furnace heating. By decreasing the CO partial pressure from 3.5 mbar to 0.2 mbar, the temperature required for almost complete reactant consumption could be decreased from 1800°C to 1550°C. Deposits condensed on the relatively cold reactor walls contained up to 71 wt% of Al. Almost pure aluminum was observed as Al drops, while a gray powder contained 60–80% Al and a yellow-orange powder contained only Al4C3, Al-oxycarbides and Al2O3.

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Konferenzberichte zum Thema "Complex Concentrated Alloys"

Chaskis, Spyridon, Marianthi Bouzouni, Evangelos Gavalas, Vasilis Loukadakis und Spyros Papaefthymiou. „Development of Complex Concentrated Alloys (CCAs) Utilizing Scrap to Preserve Critical Raw Materials“. In RawMat 2021. Basel Switzerland: MDPI, 2022. http://dx.doi.org/10.3390/materproc2021005109.

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He, L., A. Couet, K. Sridharan, M. Moorehead, M. Elbakhshwan, M. Bachhav und C. Parkin. „Ion irradiation effects in face-centered cubic complex concentrated solid solution alloys at high temperature“. In 2020 ANS Virtual Winter Meeting. AMNS, 2020. http://dx.doi.org/10.13182/t123-33315.

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Mitrica, Dumitru, Denisa Vonica, Marian Burada, Mihai Tudor Olaru, Beatrice Adriana Serban, Ioana Cristina Badea und Ioana Anasiei. „Corrosion Behavior of Al7Cu0.2Si0.2Zn0.2Mg0.1 Complex Concentrated Alloy, in 3wt% and 5wt% Na Cl Solution“. In CMDWC 2021. Basel Switzerland: MDPI, 2021. http://dx.doi.org/10.3390/cmdwc2021-09953.

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ANASIEI, Ioana, Ioana Cristina BADEA, Beatrice Adriana SERBAN, Mihai Tudor OLARU, Denisa VONICA, Lidia LICU, Marian BURADA und Dumitru MITRICA. „RESEARCHES REGARDING STRUCTURAL CHARACTERISTICS OF A NEW COMPLEX CONCENTRATED ALLOY OBTAINED BY RAPID SOLIDIFICATION“. In METAL 2021. TANGER Ltd., 2021. http://dx.doi.org/10.37904/metal.2021.4225.

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Qiu, Songgang, und Ross Galbraith. „Material Compatibility Study for Thermal Energy Storage Containment Structure With Phase Change Material“. In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-66634.

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A desirable feature of concentrated solar power system is to provide electricity in a dispatchable manner during cloud transients and non-daylight hours. A Dish-Stirling concentrating solar power prototype demonstration system was built to incorporate a thermal energy storage (TES) module containing a phase-change material between the solar thermal receiver and the Stirling engine. This paper presents the results of a material compatibility study conducted to determine the suitability of two different metal alloys for use in the construction of the TES module. Key requirements of the materials include strength and corrosion resistance at elevated temperatures, commercial availability, and manufacturability using common fabrication methods. The TES module contains a NaCl/NaF eutectic salt, at temperatures ranging from local ambient to 700°C, where the salt is slightly superheated above its melt temperature. Sample containers made from SS316L and Inconel 625 were fabricated and thoroughly cleaned for compatibility studies based on an extensive literature review. Both the containers and the salt constituents were subjected to a bake-out cycle to drive off moisture, and permit outgassing of contaminants. The containers were filled with salt in a controlled-atmosphere glove box. Filled containers were crimped and sealed by electron-beam welding. The finished samples were placed in a furnace, heated, and held at 750°C. One of each sample container material was removed from the furnace at both 100 and 2500 hours. The containers were cut open to analyze and evaluate the material surface and cross-section. After 100 hours, both SS316L and Inconel 625 exhibited a very small amount of corrosion. The stainless steel suffered a shallow inter-granular grain boundary attack, on the order of 1–2 mm in depth. The Inconel 625 surface formed an oxide complex, which is resistant to dissolution into the molten salt. After 2500 hours, the surface morphology for both materials was largely unchanged, with the corrosion process having switched from an initial localized pattern, to a more uniform pattern. The corrosion depth measured at 2500 hours remained near 1–2 mm, suggesting that the corrosion rate decelerated. Both materials showed promise for compatibility with the chosen salt.

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Pesterev, Alexander V., und Lawrence A. Bergman. „The Response of a Nonconservative Distributed System to a Moving Oscillator“. In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-4068.

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Abstract The problem of calculating the response of a nonconservative distributed parameter system of a general type excited by a moving concentrated load is investigated. A method of solution based on the expansion of the response in a series in terms of complex eigenfunctions of the distributed system is proposed. A set of ordinary differential equations in the time-dependent coefficients of the expansion is established first, in terms of the unknown force acting on the continuum from a moving vehicle, which allows one to investigate different models of concentrated loads. Then, for the case of a conservative oscillator moving with an arbitrarily varying speed, the coefficients of the equations are obtained in explicit terms.

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Eventoff, Arnold T. „Automated Cam-Mechanism Synthesis and Analysis“. In ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0299.

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Abstract An automated computer-based method for deriving the shape of machine elements such as cams is described for complex mechanisms. Traditional cam synthesis concentrates on follower motion; the method described here enables complete control of the required output motion. Output motion is defined for any constant or variable camshaft velocity. The process is not limited by the degrees of freedom, follower shape, follower suspension, or complexity of the mechanism linking followers to output points. The method includes a velocity analysis to predict cam shape, pressure angle, and relative velocity of the follower with respect to the cam. This analysis allows immediate visual inspection and further dynamic and wear analyses. Cam-follower contact stress is readily calculated for an entire cycle of motion during the synthesis process. An example consisting of a five-bar linkage displaced by three cams is synthesized using the methodology. The general method described facilitates development of mechanisms previously not feasible using conventional methods. Servomotor command displacement profiles required for complex systems can also be derived using this method.

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van Elsas, P. A., und J. S. M. Vergeest. „Creation and Manipulation of Complex Displacement Features During the Conceptual Phase of Design“. In ASME 1996 Design Engineering Technical Conferences and Computers in Engineering Conference. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-detc/cie-1332.

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Abstract Surface feature design is not well supported by contemporary free form surface modelers. For one type of surface feature, the displacement feature, it is shown that intuitive controls can be defined for its design. A method is described that, given a surface model, allows a designer to create and manipulate displacement features. The method uses numerically stable calculations, and feedback can be obtained within tenths of a second, allowing the designer to employ the different controls with unprecedented flexibility. The algorithm does not use refinement techniques, that generally lead to data explosion. The transition geometry, connecting a base surface to a displaced region, is found explicitly. Cross-boundary smoothness is dealt with automatically, leaving the designer to concentrate on the design, instead of having to deal with mathematical boundary conditions. Early test results indicate that interactive support is possible, thus making this a useful tool for conceptual shape design.

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Park, Sung-Yong, Jiangtao Cheng und Chung-Lung (C L. ). Chen. „Microfluidic Tunable Liquid Prisms for Solar Beam Steering and Concentration“. In ASME 2013 7th International Conference on Energy Sustainability collocated with the ASME 2013 Heat Transfer Summer Conference and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/es2013-18039.

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Concentrated photovoltaic (CPV) is an alternative solution to reduce the cost of solar PV systems by using less semiconductor materials. One key component in CPV systems is a solar tracker that enables to keep them in an optimal position to maximize solar concentration. However, CPV solar trackers typically are expensive, often unreliable and require lots of power, because they are composed of bulky, complex and heavy mechanical moving parts such as motors and supporting frames. These bulky and heavy tracking components make CPV systems difficult to be installed on building or residential rooftop. We present a microfluidic tunable liquid prim panel that enables to track the daily and seasonal sun’s motion and concentrate steered sunlight onto a solar cell for solar power generation. The panel consists of arrayed tunable liquid prisms. An apex angle in each prism is tuned by electrowetting, which allows incident light to be adaptively steered and focused onto a solar cell. Our systems consume very little power in the range of ∼mW as well as require no heavy and expensive supporting hardware or moving parts for solar tracking. We discuss concept, design and analytical estimation of the system performances. It is able to steer incoming light beam with incident angle up to α = ± 70°, while only causing additional optical reflection loss about 5 ∼ 10%. We have fabricated the liquid prism with a 1cm × 1cm aperture area and demonstrated apex angle modulation up to φ = ± 30°, and beam steering up to Δα = 14.6°. By eliminating expensive and inefficient motor-driven mechanical solar trackers, our optofluidic solar tracking system can offer a cost-effective CPV system with low power consumption for residential or building rooftop installation.

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Young, T. H., T. N. Shiau und S. H. Chiu. „Effects of Free Damping Layers on Harmonic Response of Rotating Blades“. In ASME 1989 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1989. http://dx.doi.org/10.1115/89-gt-92.

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This paper studies the forced vibration of a rotating blade with free damping layers to harmonic excitation by means of the finite element method. The damping layers are made of viscoelastic material with complex elastic modulus, and the excitation may be either distributed or concentrated. Triangular elements with totally 15 d.o.f. are used to allow for a great variety of shapes and boundary conditions. The effects of various parameters, such as loss factor, storage modulus and thickness of damping layers, are investigated. The results show that the vibration amplitudes near resonances can be significantly reduced by the free damping layers.

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Berichte der Organisationen zum Thema "Complex Concentrated Alloys"

Baader, Franz, und Ralf Küsters. Matching Concept Descriptions with Existential Restrictions. Aachen University of Technology, 1999. http://dx.doi.org/10.25368/2022.93.

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Matching of concepts with variables (concept patterns) is a relatively new operation that has been introduced in the context of description logics, originally to help filter out unimportant aspects of large concepts appearing in industrial-strength knowledge bases. Previous work has concentrated on (sub-)languages of CLASSIC, which in particular do not allow for existential restrictions. In this work, we present sound and complete decision algorithms for the solvability of matching problems and for computing sets of matchers for matching problems in description logics with existential restrictions.

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Baader, Franz, und Ralf Küsters. Matching Concept Descriptions with Existential Restrictions. Aachen University of Technology, 1999. http://dx.doi.org/10.25368/2022.93.

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Perl-Treves, Rafael, Rebecca Grumet, Nurit Katzir und Jack E. Staub. Ethylene Mediated Regulation of Sex Expression in Cucumis. United States Department of Agriculture, Januar 2005. http://dx.doi.org/10.32747/2005.7586536.bard.

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Monoecious species such as melon and cucumber develop separate male and female (or bisexual) flowers on the same plant individual. They display complex genetic and hormonal regulation of sex patterns along the plant. Ethylene is known to play an important role in promoting femaleness and inhibiting male development, but many questions regarding critical sites of ethylene production versus perception, the relationship between ethylene and the sex determining loci, and the possible differences between melon and cucumber in this respect are still open. The general goal of the project was to elucidate the role of ethylene in determining flower sex in Cucumis species, melon and cucumber. The specific Objectives were: 1. Clone and characterize expression patterns of cucumber genes involved in ethylene biosynthesis and perception. 2. Genetic mapping of cloned genes and markers with respect to sex loci in melon and cucumber. 3. Produce and analyze transgenic melons altered in ethylene production or perception. In the course of the project, some modifications/adjustments were made: under Objective 2 (genetic mapping) a set of new mapping populations had to be developed, to allow better detection of polymorphism. Under Objective 3, cucumber transformation systems became available to us and we included this second model species in our plan. The main findings of our study support the pivotal role of ethylene in cucumber and melon sex determination and later stages of reproductive development. Modifying ethylene production resulted in profound alteration of sex patterns in melon: femaleness increased, and also flower maturation and fruit set were enhanced, resulting in earlier, more concentrated fruit yield in the field. Such effect was previously unknown and could have agronomic value. Our results also demonstrate the great importance of ethylene sensitivity in sex expression. Ethylene perception genes are expressed in sex-related patterns, e.g., gynoecious lines express higher levels of receptor-transcripts, and copper treatments that activate the receptor can increase femaleness. Transgenic cucumbers with increased expression of an ethylene receptor showed enhanced femaleness. Melons that expressed a defective receptor produced fewer hermaphrodite flowers and were insensitive to exogenous ethylene. When the expression of defective receptor was restricted to specific floral whorls, we saw that pistils were not inhibited by the blocked perception at the fourth whorl. Such unexpected findings suggest an indirect effect of ethylene on the affected whorl; it also points at interesting differences between melon and cucumber regarding the mode of action of ethylene. Such effects will require further study. Finally, our project also generated and tested a set of novel genetic tools for finer identification of sex determining genes in the two species and for efficient breeding for these characters. Populations that will allow easier linkage analysis of candidate genes with each sex locus were developed. Moreover, effects of modifier genes on the major femaleness trait were resolved. QTL analysis of femaleness and related developmental traits was conducted, and a comprehensive set of Near Isogenic Lines that differ in specific QTLs were prepared and made available for the private and public research. Marker assisted selection (MAS) of femaleness and fruit yield components was directly compared with phenotypic selection in field trials, and the relative efficiency of MAS was demonstrated. Such level of genetic resolution and such advanced tools were not used before to study these traits, that act as primary yield components to determine economic yields of cucurbits. In addition, this project resulted in the establishment of workable transformation procedures in our laboratories and these can be further utilized to study the function of sex-related genes in detail.

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