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High Entropy Alloys

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High Entropy Alloys

High Entropy Alloys Book
Author : Michael C. Gao,Jien-Wei Yeh,Peter K. Liaw,Yong Zhang
Publisher : Springer
Release : 2016-04-27
ISBN : 3319270133
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.

High Entropy Alloys

High Entropy Alloys Book
Author : B.S. Murty,Jien-Wei Yeh,S. Ranganathan,P. P. Bhattacharjee
Publisher : Elsevier
Release : 2019-03-16
ISBN : 0128160683
Language : En, Es, Fr & De

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Book Description :

High-Entropy Alloys, Second Edition provides a complete review of the current state of the field of high entropy alloys (HEA). Building upon the first edition, this fully updated release includes new theoretical understandings of these materials, highlighting recent developments on modeling and new classes of HEAs, such as Eutectic HEAs and Dual phase HEAs. Due to their unique properties, high entropy alloys have attracted considerable attention from both academics and technologists. This book presents the fundamental knowledge, the spectrum of various alloy systems and their characteristics, key focus areas, and the future scope of the field in terms of research and technological applications. Provides an up-to-date, comprehensive understanding on the current status of HEAs in terms of theoretical understanding and modeling efforts Gives a complete idea on alloy design criteria of various classes of HEAs developed so far Discusses the microstructure property correlations in HEAs in terms of structural and functional properties Presents a comparison of HEAs with other multicomponent systems, like intermetallics and bulk metallic glasses

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 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 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.

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.

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

High entropy Alloys Book
Author : Jien-Wei Yeh,Andrew Davison
Publisher : Unknown
Release : 2006
ISBN : 9782743009571
Language : En, Es, Fr & De

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Book Description :

Download High entropy Alloys book written by Jien-Wei Yeh,Andrew Davison, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Characterization of High entropy Alloys

Characterization of High entropy Alloys Book
Author : Daniel Costas Bosque
Publisher : Unknown
Release : 2018
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

High Entropy Alloys (HEA) are alloy systems that are formed with five or more principal elements of alloy or have an entropy of mixture higher than 1.5R. Although at first it may seem like if it is extrapolated from binary and ternary diagrams these supposed high entropy alloys may generate very complex microstructures with multiple phases, segregations and intermetallic compounds, making them very difficult to analyze and understand, however, due to the thermodynamics involved in a system with multiple components, HEAs tend to have simple crystal structure like body-centered cubic (BCC) and face-centered cubic (FCC). Because of the first ideas that multiple elements alloys tend to have complicated microstructures and non-interesting properties, this field of study wasn't explored until the year 2004 when Jian-Wei Yeh and Brian Candor started investigating them. After the first studies, showing to the world that these new alloys presented interesting properties, publications related to High Entropy Alloys started increasing worldwide as it can be seen in Figure 1. As the investigation effort related to HEAs is increasing, the more it is becoming clear that HEA systems exhibit excellent characteristics such as high strength and hardness, excellent wear resistance, high-temperature strength, good structural stability, good corrosion and oxidation resistance over conventional alloys.

Alloy Design for High entropy Alloys

Alloy Design for High entropy Alloys Book
Author : Saad Sheikh
Publisher : Unknown
Release : 2018
ISBN : 9789175977621
Language : En, Es, Fr & De

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Book Description :

Download Alloy Design for High entropy Alloys book written by Saad Sheikh, 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 : Jonathan Mainwaring
Publisher : Unknown
Release : 2016
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

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

Computational Study of High Entropy Alloys HEAs Plastic Behavior and Dislocation

Computational Study of High Entropy Alloys  HEAs  Plastic Behavior and Dislocation Book
Author : Navid Kermanshahimonfared
Publisher : Unknown
Release : 2019
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Computational Study of High Entropy Alloys HEAs Plastic Behavior and Dislocation book written by Navid Kermanshahimonfared, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Development of New High Entropy Alloys for Brazing of Ni base Superalloys

Development of New High Entropy Alloys for Brazing of Ni base Superalloys Book
Author : Minrui Gao
Publisher : Unknown
Release : 2017
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Development of New High Entropy Alloys for Brazing of Ni base Superalloys book written by Minrui Gao, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

FeCoCrNiMo High entropy Alloys Prepared by Powder Metallurgy Processing for Diamond Tool Applications

FeCoCrNiMo High entropy Alloys Prepared by Powder Metallurgy Processing for Diamond Tool Applications Book
Author : Anonim
Publisher : Unknown
Release : 2018
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

ABSTRACT: High-entropy alloys (HEAs) show good mechanical properties like high strength, hardness and wear resistance, and this makes them attractive for application in diamond tools. However, there are severe obstacles to improving the mechanical properties of normal diamond tools with metal-matrix alloys. Here, we report the formation of FeCoCrNiMo HEAs by powder metallurgy processing, starting from a gas-atomised powder followed by mechanical milling and consolidation by spark plasma sintering. Our results show that FeCoCrNiMo HEAs with pure FCC phase can be obtained by this method. Specimens with higher hardness can be obtained at higher temperatures and low pressures, while specimens with higher bending strength are formed at lower temperatures and pressures. FeCoCrNiMo HEAs have remarkably higher hardness and better wear behaviour than metal-matrices commonly in used diamond tools, which indicates that a new type of diamond tool with superior properties can be realised from HEAs. Special theme block on high entropy alloys, guest edited by Paula Alvaredo Olmos, Universidad Carlos III de Madrid, Spain, and Sheng Guo, Chalmers University, Gothenburg, Sweden.

TiZrNbTa Mo High entropy Alloys Dependence of Microstructure and Mechanical Properties on Mo Concentration and Modeling of Solid Solution Strengthening

 TiZrNbTa  Mo High entropy Alloys  Dependence of Microstructure and Mechanical Properties on Mo Concentration and Modeling of Solid Solution Strengthening Book
Author : Anonim
Publisher : Unknown
Release : 2018
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download TiZrNbTa Mo High entropy Alloys Dependence of Microstructure and Mechanical Properties on Mo Concentration and Modeling of Solid Solution Strengthening book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Corrosion of High entropy Alloys in Chloride Solutions

Corrosion of High entropy Alloys in Chloride Solutions Book
Author : Orion J. Swanson
Publisher : Unknown
Release : 2018
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

High entropy alloys (HEAs) are a new class of alloys composed of five or more major alloying elements, each making up between 5 at% and 35 at% of the total composition. HEAs have shown promising characteristics of superior corrosion resistance, and have a huge possible compositional space, which is largely unexplored. The intent of this project is to develop greater understanding of how composition influences the corrosion resistance of HEAs in chloride solutions. An integrated computational materials engineering (ICME) approach has been adopted to produce single phase corrosion resistant HEAs. A combined empirical and computational approach was employed to generate HEAs with variations in composition and corrosion resistance. Initial investigation focused on a Ni-rich HEA, Ni38Cr21Fe20Mo6W2Ru13, which has shown exceptional corrosion resistance in concentrated acidic chloride environments. The alloy was tested potentiodynamically in strong HCl solutions, showing spontaneous passivity until high voltages, where corrosion was transpassive and no signs of localized corrosion.

Synthesis of Porous Co1 5CrFeNi1 5Ti High Entropy Alloys

Synthesis of Porous Co1 5CrFeNi1 5Ti High Entropy Alloys Book
Author : Anonim
Publisher : Unknown
Release : 2016
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

The formation of porous Co1.5CrFeNi1.5Ti high entropy alloy was investigated through the use of classifying principle elemental powders and through the addition of a TiH2 blowing agent. Compacts underwent spark plasma sintering and subsequently analyzed. The classification of principle elemental powder method produced Co1.5CrFeNi1.5Ti high entropy alloy material with porosity of 29-30%, while the use of the TiH2 blowing agent produced porosity of 8.7-16.5%. Microhardness values of HV 209-250 were observed, resulting in the porosity having little to no effect on the microhardness of the high entropy alloy composite. In this method, the particles are spark plasma sintered in order to achieve porosity that would not be possible through the conventional high entropy alloy processing method of vacuum arc-melting and casting. Solid state phase transformation was investigated by x-ray diffraction (XRD) and energy-dispersive x-ray spectroscopy (EDX) analysis, while porosity was calculated and investigated using Archimedes method. EDX analysis confirms the elemental make up of the alloy to confirm it suits the definition of a high entropy alloy. XRD analysis confirms the presence of both FCC and BCC phases after spark plasma sintering. Compositional changes revealed by EDX analysis are shown in scanning electron microscopy (SEM) images..

Homogenization of AlxCoCrFeNi High entropy Alloys with Improved Corrosion Resistance

Homogenization of AlxCoCrFeNi High entropy Alloys with Improved Corrosion Resistance Book
Author : Anonim
Publisher : Unknown
Release : 2018
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Highlights: 1250°C heat treatments enhance the corrosion resistance of Al x CoCrFeNi HEAs. Homogenization is revealed by the decreased work function variations among phases. Thermodynamic calculations could predict the phase transformation of HEAs. Abstract: The present work investigates the homogenization effect of 1250°C heat treatment on the Al x CoCrFeNi high-entropy alloys (HEAs). The multi-phase microstructures with chemical segregations are inevitable with the increased Al content in the alloys, which cause work function variations and localized corrosion. After heat treatment, the homogenization effect revealed by the microstructure simplification and chemical-segregation reduction leads to the decreased work function variations and the improved corrosion resistance. Thermodynamic calculations that are reliable to predict the phase transformations of the Al x CoCrFeNi HEAs, indicates a further enhancement in corrosion resistance through annealing could be guided for many other HEAs systems.