Atomic Scale Microstructure Analysis Of High Entropy Alloys And Silicide Using Scanning Transmission Electron Microscope
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Atomic Scale Microstructure Analysis Of High Entropy Alloys And Silicide Using Scanning Transmission Electron Microscope
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Author :
language : en
Publisher:
Release Date : 2022
Atomic Scale Microstructure Analysis Of High Entropy Alloys And Silicide Using Scanning Transmission Electron Microscope written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1994
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.
Characterization Of A High Strength Refractory High Entropy Alloy Almo0 5nbta0 5tizr
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Author : Jacob K. Jensen
language : en
Publisher:
Release Date : 2017
Characterization Of A High Strength Refractory High Entropy Alloy Almo0 5nbta0 5tizr written by Jacob K. Jensen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Alloys categories.
High entropy alloys (HEAs) are a relatively new class of materials that have garnered significant interest over the last decade due to their intriguing balance of properties including high strength, toughness, and corrosion resistance. In contrast to conventional alloy systems, HEAs are based on four or more principal elements with near equimolar concentrations and tend to have simple microstructures due to the preferential formation of solid solution phases. HEAs appear to offer new pathways to lightweighting in structural applications, new alloys for elevated temperature components, and new magnetic materials, but more thorough characterization studies are needed to assess the viability of the recently developed multicomponent materials. One such HEA, AlMo0.5NbTa0.5TiZr, was selected to be the basis for this characterization study in part due to its strength at elevated temperatures (s0.2 = 1600 MPa at T = 800 oC) and low density compared with commercially available Ni-based superalloys. The refractory element containing HEA composition was developed in order to balance the high temperature strength of the refractory elements with the desirable properties achieved by the high entropy alloying design approach for potential use in aerospace thermal protection and structural applications. Ingots of AlMo0.5NbTa0.5TiZr were cast by vacuum arc melting followed by hot isostatic pressing (HIP) and homogenization at 1400 oC for 24 hrs with a furnace cool of 10 oC/min. The resulting microstructure was characterized at multiple length scales using x-ray diffraction (XRD), scanning transmission electron microscopy (SEM), conventional and scanning transmission electron microscopy (TEM and STEM), and x-ray energy dispersive spectroscopy (XEDS). The microstructure was found to consist of a periodic, coherent two phase mixture, where a disordered bcc phase is aligned orthogonally in an ordered B2 phase. Through microstructural evolution heat treatment studies, the nanoscale interpenetrating microstructure was discovered to form via a conditional spinodal reaction pathway involving a congruent ordering transformation preceding spinodal decomposition. In order to gain a comprehensive understanding of the true morphology of these phases and obtain a novel perspective of 3D elemental segregation in the HEA, STEM-high angle annular darkfield (HAADF) micrographs and XEDS spectral images were utilized in the tomographic reconstruction of the microstructure, which was inherently difficult to observe through conventional characterization techniques. The microstructure of the alloy was ultimately refined by incremental variations to the base alloy composition in an effort to remove deleterious intermetallic phases adversely affecting ductility. Despite the excellent compressive strength across a wide range of temperatures and the ability to tailor the microstructure by compositional modifications, microstructural and phase transformations in the desired operating temperature range indicate that the AlMo0.5NbTa0.5TiZr alloy may not be a suitable material for high temperature aerospace structural components.
Reactor Core Materials
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Author :
language : en
Publisher:
Release Date : 1959
Reactor Core Materials written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1959 with Nuclear fuels categories.
Introduction To The Thermodynamics Of Materials Fifth Edition
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Author : David R. Gaskell
language : en
Publisher: CRC Press
Release Date : 2003-02-07
Introduction To The Thermodynamics Of Materials Fifth Edition written by David R. Gaskell and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-02-07 with Business & Economics categories.
"The CD contains data and descriptive material for making detailed thermodynamic calculations involving materials processing"--Preface.
Atomic Layer Deposition For Semiconductors
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Author : Cheol Seong Hwang
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-10-18
Atomic Layer Deposition For Semiconductors written by Cheol Seong Hwang and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-18 with Science categories.
Offering thorough coverage of atomic layer deposition (ALD), this book moves from basic chemistry of ALD and modeling of processes to examine ALD in memory, logic devices and machines. Reviews history, operating principles and ALD processes for each device.
Atomic Force Microscopy
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Author : Peter Eaton
language : en
Publisher: Oxford University Press
Release Date : 2010-03-25
Atomic Force Microscopy written by Peter Eaton and has been published by Oxford University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-03-25 with Science categories.
Atomic force microscopes are very important tools for the advancement of science and technology. This book provides an introduction to the microscopes so that scientists and engineers can learn both how to use them, and what they can do.
High Entropy Alloys
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Author : Michael C. Gao
language : en
Publisher: Springer
Release Date : 2016-04-27
High Entropy Alloys written by Michael C. Gao and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-04-27 with Technology & Engineering categories.
This book provides a systematic and comprehensive description of high-entropy alloys (HEAs). The authors summarize key properties of HEAs from the perspective of both fundamental understanding and applications, which are supported by in-depth analyses. The book also contains computational modeling in tackling HEAs, which help elucidate the formation mechanisms and properties of HEAs from various length and time scales.
Boron And Refractory Borides
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Author : G.V. Samsonov
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Boron And Refractory Borides written by G.V. Samsonov and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
V. I. MATKOVICH During the meeting of the International Symposium on Boron held in October, 1972 in Tbilisi, U.S.S.R., the idea was proposed to assemble a review of boron and refractory borides by the specialists present. The advantages of such a work were immediately apparent. Such diverse applications of borides as in protective armor, nuclear reactors, coat ings, reinforcement, etc. can hardly all be presented in sufficient detail by a single author. On the other hand it was also recognized that with so much specialization, some areas of interest may not be covered. Within the last decade or two a number of areas have been developed in which the use of refractory borides is growing and improvements are being actively explored. Thus, a number of borides have considerable potential as reinforcing material for plastics or light metals, though only boron fibers have been firmly established up to the present. Ap plication of flakes and films for two-dimensional reinforcement appears attractive, although the high cost of materials and development repre sents a considerable barrier. A number of borides have been used to manufacture lightweight protec tive armor. In this area relatively fast changes seem to be taking place as improvements in performance and weight are made. Boron carbide has found considerable use in this application and new developments exploit the light weight of beryllium borides.
An Introduction To Surface Analysis By Xps And Aes
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Author : John F. Watts
language : en
Publisher: John Wiley & Sons
Release Date : 2019-08-27
An Introduction To Surface Analysis By Xps And Aes written by John F. Watts and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-08-27 with Technology & Engineering categories.
Provides a concise yet comprehensive introduction to XPS and AES techniques in surface analysis This accessible second edition of the bestselling book, An Introduction to Surface Analysis by XPS and AES, 2nd Edition explores the basic principles and applications of X-ray Photoelectron Spectroscopy (XPS) and Auger Electron Spectroscopy (AES) techniques. It starts with an examination of the basic concepts of electron spectroscopy and electron spectrometer design, followed by a qualitative and quantitative interpretation of the electron spectrum. Chapters examine recent innovations in instrument design and key applications in metallurgy, biomaterials, and electronics. Practical and concise, it includes compositional depth profiling; multi-technique analysis; and everything about samples—including their handling, preparation, stability, and more. Topics discussed in more depth include peak fitting, energy loss background analysis, multi-technique analysis, and multi-technique profiling. The book finishes with chapters on applications of electron spectroscopy in materials science and the comparison of XPS and AES with other analytical techniques. Extensively revised and updated with new material on NAPXPS, twin anode monochromators, gas cluster ion sources, valence band spectra, hydrogen detection, and quantification Explores key spectroscopic techniques in surface analysis Provides descriptions of latest instruments and techniques Includes a detailed glossary of key surface analysis terms Features an extensive bibliography of key references and additional reading Uses a non-theoretical style to appeal to industrial surface analysis sectors An Introduction to Surface Analysis by XPS and AES, 2nd Edition is an excellent introductory text for undergraduates, first-year postgraduates, and industrial users of XPS and AES.