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H E a High Entropy Alloys

H E a High Entropy Alloys Book
Author : A. Kanni Raj
Publisher : Createspace Independent Publishing Platform
Release : 2017-05-30
ISBN : 9781547016365
Language : En, Es, Fr & De

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Book Description :

HEA : High-Entropy Alloys (also known as CCA or MPEA) - are equiatomic and nonequiatomic multicomponent alloys. The configurational entropy of these alloys is expected to be very high at their random solution states. Such a high entropy is expected to drive the tendency to form simple solid solutions (crystalline or amorphous) rather than complex microstructures with many compounds. These alloys do form simple solid solutions in most of the cases and the number of phases observed in these alloys is much less than the maximum predicted from the Gibbs phase rule. The researchers also feel that HEAs can substitute conventional materials in advanced applications so that the limitations of the latter in service life and operational conditions could be overcome by providing superior performance of the former. A number of processing routes, including conventional melting and casting, mechanical alloying, various coating techniques, and even combinatorial materials science approaches are being used to synthesize and process this new class of alloys. There have been a lot of studies on understanding both the structural and functional properties of these alloys. The results of HEAs and HEA-related materials reported so far by various research groups are very encouraging for their applications in a wide range of fields such as materials for engine, nuclear plant, chemical plant, marine structure, tool, mold, hard facing, and functional coatings. This book presents a comprehensive insight into all the above aspects of this exciting new class of alloys.

High Entropy Alloys

High Entropy Alloys Book
Author : T.S. Srivatsan,Manoj Gupta
Publisher : CRC Press
Release : 2020-07-20
ISBN : 1000046834
Language : En, Es, Fr & De

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Book Description :

This book provides a cohesive overview of innovations, advances in processing and characterization, and applications for high entropy alloys (HEAs) in performance-critical and non-performance-critical sectors. It covers manufacturing and processing, advanced characterization and analysis techniques, and evaluation of mechanical and physical properties. With chapters authored by a team of internationally renowned experts, the volume includes discussions on high entropy thermoelectric materials, corrosion and thermal behavior of HEAs, improving fracture resistance, fatigue properties and high tensile strength of HEAs, HEA films, and more. This work will be of interest to academics, scientists, engineers, technologists, and entrepreneurs working in the field of materials and metals development for advanced applications. Features Addresses a broad spectrum of HEAs and related aspects, including manufacturing, processing, characterization, and properties Emphasizes the application of HEAs Aimed at researchers, engineers, and scientists working to develop materials for advanced applications T.S. Srivatsan, PhD, Professor of Materials Science and Engineering in the Department of Mechanical Engineering at the University of Akron (Ohio, USA), earned his MS in Aerospace Engineering in 1981 and his PhD in Mechanical Engineering in 1984 from the Georgia Institute of Technology (USA). He has authored or edited 65 books, delivered over 200 technical presentations, and authored or co-authored more than 700 archival publications in journals, book chapters, book reviews, proceedings of conferences, and technical reports. His RG score is 45 with a h-index of 53 and Google Scholar citations of 9000, ranking him to be among the top 2% of researchers in the world. He is a Fellow of (i) the American Society for Materials International, (ii) the American Society of Mechanical Engineers, and (iii) the American Association for Advancement of Science. Manoj Gupta, PhD, is Associate Professor of Materials at NUS, Singapore. He is a former Head of Materials Division of the Mechanical Engineering Department and Director Designate of Materials Science and Engineering Initiative at NUS, Singapore. In August 2017, he was highlighted among the Top 1% Scientists of the World by the Universal Scientific Education and Research Network and in the Top 2.5% among scientists as per ResearchGate. In 2018, he was announced as World Academy Championship Winner in the area of Biomedical Sciences by the International Agency for Standards and Ratings. A multiple award winner, he actively collaborates/visits as an invited researcher and visiting and chair professor in Japan, France, Saudi Arabia, Qatar, China, the United States, and India.

High Entropy Alloys

High Entropy Alloys Book
Author : B.S. Murty,Jien-Wei Yeh,S. Ranganathan
Publisher : Butterworth-Heinemann
Release : 2014-06-21
ISBN : 0128005262
Language : En, Es, Fr & De

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Book Description :

This book provides a complete review of the current state of the art in the field of high entropy alloys (HEA). The conventional approach to alloy design is to select one principal element and add elements to it in minor quantities in order to improve the properties. In 2004, Professor J.W. Yeh and his group first reported a new approach to alloy design, which involved mixing elements in equiatomic or near-equiatomic proportions, to form multi-component alloys with no single principal element. These alloys are expected to have high configurational entropy and hence were termed as "high entropy alloys." HEAs have a broad range of structures and properties, and may find applications in structural, electrical, magnetic, high-temperature, wear-resistant, corrosion-resistant, and oxidation-resistant components. Due to their unique properties, high entropy alloys have attracted considerable attention from both academics and technologists. This book presents the fundamental knowledge present in the field, the spectrum of various alloy systems and their characteristics studied to date, current key focus areas, and the future scope of the field in terms of research and technological applications. Encompasses the synthesis and phase formation of high entropy alloys Covers design of HEAs based on thermodynamic criteria Discusses the structural and functional properties of HEAs Provides a comparison of HEAs with other multicomponent systems like intermetallics and bulk metallic glasses

Structure and Properties of High Entropy Alloys

Structure and Properties of High Entropy Alloys Book
Author : V. E. Gromov,S. V. Konovalov,Yu. F. Ivanov,K. A. Osintsev
Publisher : Springer Nature
Release : 2021-07-10
ISBN : 3030783642
Language : En, Es, Fr & De

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Book Description :

This book provides an overview of high entropy alloys, explaining all the basics of this new class of materials that emerged at the beginning of the 21st: It begins with the basics of the manufacturing methods of high entropy alloys and discusses the mechanical properties and deformation mechanisms of high entropy alloys. Then the book addresses the stability of these alloys and explores the prospects of high entropy alloys for applications.This book is intended as an introduction for physicists and materials scientists who need to become familiar with high entropy alloys.

High Entropy Alloys

High Entropy Alloys Book
Author : T.S. Srivatsan,Manoj Gupta
Publisher : CRC Press
Release : 2020-07-21
ISBN : 1000046974
Language : En, Es, Fr & De

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Book Description :

This book provides a cohesive overview of innovations, advances in processing and characterization, and applications for high entropy alloys (HEAs) in performance-critical and non-performance-critical sectors. It covers manufacturing and processing, advanced characterization and analysis techniques, and evaluation of mechanical and physical properties. With chapters authored by a team of internationally renowned experts, the volume includes discussions on high entropy thermoelectric materials, corrosion and thermal behavior of HEAs, improving fracture resistance, fatigue properties and high tensile strength of HEAs, HEA films, and more. This work will be of interest to academics, scientists, engineers, technologists, and entrepreneurs working in the field of materials and metals development for advanced applications. Features Addresses a broad spectrum of HEAs and related aspects, including manufacturing, processing, characterization, and properties Emphasizes the application of HEAs Aimed at researchers, engineers, and scientists working to develop materials for advanced applications T.S. Srivatsan, PhD, Professor of Materials Science and Engineering in the Department of Mechanical Engineering at the University of Akron (Ohio, USA), earned his MS in Aerospace Engineering in 1981 and his PhD in Mechanical Engineering in 1984 from the Georgia Institute of Technology (USA). He has authored or edited 65 books, delivered over 200 technical presentations, and authored or co-authored more than 700 archival publications in journals, book chapters, book reviews, proceedings of conferences, and technical reports. His RG score is 45 with a h-index of 53 and Google Scholar citations of 9000, ranking him to be among the top 2% of researchers in the world. He is a Fellow of (i) the American Society for Materials International, (ii) the American Society of Mechanical Engineers, and (iii) the American Association for Advancement of Science. Manoj Gupta, PhD, is Associate Professor of Materials at NUS, Singapore. He is a former Head of Materials Division of the Mechanical Engineering Department and Director Designate of Materials Science and Engineering Initiative at NUS, Singapore. In August 2017, he was highlighted among the Top 1% Scientists of the World by the Universal Scientific Education and Research Network and in the Top 2.5% among scientists as per ResearchGate. In 2018, he was announced as World Academy Championship Winner in the area of Biomedical Sciences by the International Agency for Standards and Ratings. A multiple award winner, he actively collaborates/visits as an invited researcher and visiting and chair professor in Japan, France, Saudi Arabia, Qatar, China, the United States, and India.

Initial Weldability of High Entropy Alloys for High Temperature Applications

Initial Weldability of High Entropy Alloys for High Temperature Applications Book
Author : Alexander Charles Martin
Publisher : Unknown
Release : 2019
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

High Entropy Alloys (HEA) are a new class of alloys that was introduced in the early 2000's. These alloys are composed of five or more elements in near equiatomic ratios, with no single base element. HEAs have gained a lot of attention due to their unique or superior properties as compared to conventional alloys. However, there has been little attention paid to the welding metallurgy and weldability of HEAs. However, welding for manufacturing and repair is a key issue for structural engineering applications. This work aimed to establish an initial understanding of the welding metallurgy of HEAs, and identify any potential weldability issues with regard to weld cracking susceptibility in fusion welds. The outcomes of this initial evaluation were used to develop a methodology for rapidly screening the large compositional space of HEAs in order to find promising alloy compositions for weld applications, and ultimately to implement weldability in the early stages of HEA development. The most commonly studied equiatomic AlCoCrCuFeNi HEA was determined to have very poor weldability, due to the positive mixing enthalpy of copper and a high hardness microstructure promoted by aluminum. An improved weldability was achieved by modifying the composition to Al0.5CoCrCu0.1FeNi. Pulsed laser welding was shown to eliminate HAZ liquation cracking for AlCoCrFeNiTi HEA and reduces softening in the HAZ of Al0.5CoCrCu0.1FeNi HEA. Refractory HEA AlMo0.5NbTa0.5TiZr showed a very high susceptibility to porosity and brittle fracture, but a unique fusion zone microstructure with no cracking. A high-throughput screening based on thermodynamic modeling and experimental testing was developed in order to identify HEA compositions with promising weldability, and quickly reject alloy compositions with detrimental properties towards weldability.

High Entropy Alloys

High Entropy Alloys Book
Author : Michael C. Gao,Jien-Wei Yeh,Peter K. Liaw,Yong Zhang
Publisher : Springer
Release : 2016-05-09
ISBN : 9783319270111
Language : En, Es, Fr & De

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Book Description :

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.

Engineering Steels and High Entropy Alloys

Engineering Steels and High Entropy Alloys Book
Author : Ashutosh Sharma,Sanjeev Kumar,Zoia Duriagina
Publisher : BoD – Books on Demand
Release : 2020-06-24
ISBN : 1789859476
Language : En, Es, Fr & De

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Book Description :

"This book entitled “Engineering Steels and High Entropy-Alloys” presents an overview of various types of advanced steels and high entropy alloys. It also discusses the current research trends, problems, and applications of engineering steels and high entropy materials. The book also gives a brief overview of advances in surface protection strategies of steels and laser processing of materials (additive manufacturing). The various key features of this book include: 1. A comprehensive overview of various types of engineering steels, phase transformation, and applications in engineering. 2. A complete detailed understanding and mechanism of high entropy materials, including high entropy alloys and ceramics. 3. Descriptions of structure-property relationships in high entropy materials and their application in various fields such as biomedical implants. 4. A brief review of various laser processing (additive manufacturing) and surface protection of advanced materials."

New Advances in High Entropy Alloys

New Advances in High Entropy Alloys Book
Author : Yong Zhang
Publisher : MDPI
Release : 2021-02-16
ISBN : 3039436198
Language : En, Es, Fr & De

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Book Description :

In recent years, people have tended to adjust the degree of order/disorder to explore new materials. The degree of order/disorder can be measured by entropy, and it can be divided into two parts: topological disordering and chemical disordering. The former mainly refers to order in the spatial configuration, e.g., amorphous alloys which show short-range ordering but without long-range ordering, while the latter mainly refers to the order in the chemical occupancy, that is to say, the components can replace each other, and typical representatives are high-entropy alloy (HEAs). HEAs, in sharp contrast to traditional alloys based on one or two principal elements, have one striking characteristic: their unusually high entropy of mixing. They have not received much noticed until the review paper entitled “Microstructure and Properties of High-Entropy Alloys” was published in 2014 in the journal of Progress in Materials Science. Numerous reports have shown they exhibit five recognized performance characteristics, namely, strength–plasticity trade-off breaking, irradiation tolerance, corrosion resistance, high-impact toughness within a wider temperature range, and high thermal stability. So far, the development of HEAs has gone through three main stages: 1. Quinary equal-atomic single-phase solid solution alloys; 2. Quaternary or quinary non-equal-atomic multiphase alloys; 3. Medium-entropy alloys, high-entropy fibers, high-entropy films, lightweight HEAs, etc. Nowadays, more in-depth research on high-entropy alloys is urgently needed.

High Entropy Alloys Microstructures and Properties

High Entropy Alloys    Microstructures and Properties Book
Author : David J. Fisher
Publisher : Trans Tech Publications Ltd
Release : 2015-08-04
ISBN : 303826945X
Language : En, Es, Fr & De

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Book Description :

There are relatively few revolutions in the venerable and rather staid field of metallurgy. One can count among them the advent of metallic glasses, of superplastic metals, or of memory-alloys. The latest revolution involves the relatively staid topic of alloy formulation, but is all the more startling because the resultant materials break every long-cherished rule of alloy design. In particular, the famous empirical rules of Hume-Rothery are completely ignored. That is, in the archetypal high-entropy alloy, five metals are alloyed together in equal proportions regardless of atomic-size difference, valence or crystal structure. Commonsense would tell any experienced metallurgist that that could result only in a uselessly brittle mass of intermetallic compounds. But in a truly paradigm-shifting manner, Professor J.W.Yeh of Taiwan correctly predicted that a high configurational entropy could suppress the appearance of detrimental intermetallic compounds and lead to simple familiar microstructures having very useful properties. High-Entropy Alloys can exhibit, for instance, astounding hardness and strength and also have a very good corrosion resistance. The present book summarises the microstructures and properties of all of the high-entropy alloys.

High Entropy Materials

High Entropy Materials Book
Author : Yong Zhang
Publisher : Springer
Release : 2019-05-27
ISBN : 9811385262
Language : En, Es, Fr & De

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Book Description :

This book draws on the latest research to discuss the history and development of high-entropy alloys and ceramics in bulk, film, and fiber form. High-entropy materials have recently been developed using the entropy of mixing and entropy of configuration of materials, and have proven to exhibit unique properties superior to those of conventional materials. The field of high-entropy alloys was born in 2004, and has since been developed for both scientific and engineering applications. Although there is extensive literature, this field is rapidly transforming. This book highlights the cutting edge of high-entropy materials, including their fundamentals and applications. Above all, it reflects two major milestones in their development: the equi-atomic ratio single-phase high-entropy alloys; and the non-equi-atomic ratio dual-phase high-entropy alloys.

High entropy Alloys Microstructures and Properties

High entropy Alloys   Microstructures and Properties Book
Author : Anonim
Publisher : Unknown
Release : 2015
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download High entropy Alloys Microstructures and Properties book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Phase Change and Mechanical Behaviors of TixCoCrFeNiCu1 yAly High Entropy Alloys

Phase Change and Mechanical Behaviors of TixCoCrFeNiCu1   yAly High Entropy Alloys Book
Author : Y. Zhang,G. L. Chen
Publisher : Unknown
Release : 2010
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

The alloying effects of the Al, Ti, Cu, and Co in a typical TixCoCrFeNiCu1−yAly high entropy alloy (HEA) were systematically studied. The phase change of the HEAs is closely related to the atomic packing efficiency of the phases. The high entropy of the alloy will largely lower the Gibbs free energy when the enthalpy of the alloys are not changed too much, and the high entropy phase can be an equilibrium stable one. The HEAs can have ultrahigh fracture strength at room temperature and high temperature, e.g., yield strength of 1400 MPa at 500°C.

High Entropy Alloys

High Entropy Alloys Book
Author : Elena Gordo Odériz,Juan Cornide Arce,Stanislav Kolisnychenko
Publisher : Trans Tech Publications Ltd
Release : 2021-06-15
ISBN : 3035736561
Language : En, Es, Fr & De

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Book Description :

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Fundamental Core Effects in Co Cr Fe Ni Based High Entropy Alloys

Fundamental Core Effects in Co Cr Fe Ni Based High Entropy Alloys Book
Author : Abhishek Mehta
Publisher : Unknown
Release : 2019
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

High entropy alloys (HEAs) are near equiatomic multi-principal-element-alloys (MPEAs) which are different from traditional solvent-based multicomponent alloys. Based on initial work by Yeh and Co-workers, they were proposed to exhibit four "core" effects: high entropy, sluggish diffusion, lattice distortion, and cocktail effect. Present work investigates two of the four "core" effects, i.e. high entropy and sluggish diffusion effects, in Co-Cr-Fe-Ni based transition metal high entropy alloys. Solid-to-solid diffusion couple approach was adopted to investigate, these core effects. Experimental results contradicts the "high entropy" effect based on thermodynamics analysis: that the HEAs with low entropy of mixing may be thermodynamically more stable than the HEA of similar constituent elements with high entropy of mixing. In such cases, enthalpy of mixing can also play a vital role in stabilizing the HEA with lower entropy of mixing. Measurement of diffusion coefficients (i.e. both interdiffusion and tracer diffusion coefficients) in HEAs and its comparison with conventional solvent-based multicomponent alloys suggests that diffusion is not always sluggish in high entropy alloys. Contrary to previous findings, larger fluctuations in lattice potential energy (LPE) of an alloy may not always result in anomalously slow diffusion, in comparison to alloy systems which exhibits smaller fluctuation in LPE. Findings from his dissertation provide a "controversial" understanding of high entropy alloys, and alloy development strategies in the future for the most aggressive applications such as those found in gas turbines and nuclear reactors. As these applications will certainly require the knowledge of high temperature stability and nature of diffusion under extreme application environment.

On High Entropy Effect and Sluggish Diffusion Effect of High Entropy Alloys

On High Entropy Effect and Sluggish Diffusion Effect of High Entropy Alloys Book
Author : 蔡坤佑,葉均蔚
Publisher : Unknown
Release : 2013
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download On High Entropy Effect and Sluggish Diffusion Effect of High Entropy Alloys book written by 蔡坤佑,葉均蔚, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Magnetic Characteristics of High Entropy Alloys

Magnetic Characteristics of High Entropy Alloys Book
Author : Rajesh K. Mishra
Publisher : Unknown
Release : 2018
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

High entropy alloy (HEA) is a multi-principal alloy having at least five principal elements in the concentration range of 5-35 at.%. HEAs having excellent mechanical properties and further these properties can be altered by the addition of different alloying element. For example with the addition of Al in base alloy make them a ductile and the addition of Co, Ti, et cetera transforms base alloy to brittle material. This characteristic of HEAs makes them a promising technologically important material. A soft magnetic material should have good mechanical property, structural stability at high temperature and low coercivity with high magnetization. Recently, reported FeCoNiMn0.25Al0.25 and CoCrFeNiM (M = Cu, Mn) HEAs got attention as a better soft magnetic material because these HEAs having good soft magnetic characteristics along with good mechanical and excellent structural stability at high-temperature. Recent reports described that the mechanical as well as magnetic characteristics of these alloys can be tuned by the variation and/or the addition of alloying element in the base alloys. The magnetic characteristics of these alloys basically depend on the alloying element and compositional variation of the magnetic element present in particular HEAs. We have summarized the key results of magnetic characteristics of some recently investigated promising high entropy alloys.

Dual phase Materials in the Medium and High Entropy Alloy Systems Al Cr Fe Ni and Al Co Cr Fe Ni

Dual phase Materials in the Medium and High Entropy Alloy Systems Al Cr Fe Ni and Al Co Cr Fe Ni Book
Author : Ulrike Hecht,Mark L. Weaver,Sheng Guo
Publisher : Frontiers Media SA
Release : 2021-08-25
ISBN : 2889712257
Language : En, Es, Fr & De

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Book Description :

Download Dual phase Materials in the Medium and High Entropy Alloy Systems Al Cr Fe Ni and Al Co Cr Fe Ni book written by Ulrike Hecht,Mark L. Weaver,Sheng Guo, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

High Entropy Alloys for Extreme Environments

High Entropy Alloys for Extreme Environments Book
Author : John C. Waite
Publisher : Unknown
Release : 2015
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download High Entropy Alloys for Extreme Environments book written by John C. Waite, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Local Structure and Properties of Refractory High entropy Alloys

Local Structure and Properties of Refractory High entropy Alloys Book
Author : Soumyadipta Maiti
Publisher : Unknown
Release : 2016-07-26
ISBN : 9783659905322
Language : En, Es, Fr & De

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Book Description :

Download Local Structure and Properties of Refractory High entropy Alloys book written by Soumyadipta Maiti, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.