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high-entropy alloys

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2022
DOI: 10.31399/asm.tb.mbheaktmse.t56030001
EISBN: 978-1-62708-418-5
... Abstract This chapter summarizes the progress that has been made in the study of high-entropy alloy (HEA) systems and the process-structure-property relationships that define them. It describes the various ways HEAs can be strengthened and explains how alloying elements influence tensile...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2022
DOI: 10.31399/asm.tb.mbheaktmse.t56030021
EISBN: 978-1-62708-418-5
... Abstract This chapter, presented in a question-and-answer format, covers many practical aspects of high-entropy alloys (HEAs). It provides clear and concise answers to more than 50 questions, imparting knowledge on alloying elements, heat treatments, diffusion mechanisms, phase formation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2022
DOI: 10.31399/asm.tb.mbheaktmse.9781627084185
EISBN: 978-1-62708-418-5
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420041
EISBN: 978-1-62708-310-2
... energies and chemical potentials, and shows how the equilibrium state of an alloy can be obtained from free-energy curves. binary solid solutions chemical potential Gibbs free energy interatomic bonds phase diagrams single-component systems thermodynamics THERMODYNAMICS is a branch...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.tm.t52320013
EISBN: 978-1-62708-357-7
.... However, because the entropy increases and the free energy becomes lower if they are distributed to both the energy levels, the distribution will come close to uniform distribution at the high temperature. It is assumed that there are two energy levels in this exercise; the case of more energy levels...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.tm.t52320055
EISBN: 978-1-62708-357-7
... solute atoms. chemical potential free energy regular solution model sublattice model Combining a metal and an oxide, previously thought to be “unmixable,” is now possible using new technologies of sputtering and mechanical alloying. New kinds of combined materials have been created one...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.pb.t51230105
EISBN: 978-1-62708-351-5
... that have been exposed to ambient atmospheres and these will interfere with or inhibit wetting and alloying. As a general guide, if the most refractory constituent of a parent metal is present at a concentration of above one atomic percent (see Chapter 2, Appendix A2.1 for formulae for conversion between...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230055
EISBN: 978-1-62708-298-3
... Metallurgy, X, High-Temperature Heat-Control, Heat-Capacity, and Entropy Data for Inorganic Compounds ,” Bulletin 476, U.S. Bureau of Mines Kelley K.K. , 1950 . “ Contributions to the Data on Theoretical Metallurgy, XI, Entropies of Inorganic Substances ,” Bulletin 477, Revision 1948 of Data...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.tm.t52320197
EISBN: 978-1-62708-357-7
... a disordered state is chaotic, entropy S is large and enthalpy H is high. However, S is small and H is low in an ordered state. As a result, the value of free energy G = H ≈ TS is lower in a disordered state at high temperature and in an ordered state at low temperature, so the change in state...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240053
EISBN: 978-1-62708-251-8
..., and as it becomes more negative, the driving force increases. The following develops these concepts in a little more detail. The internal energy, E , of a system (e.g., an alloy) is made up of two parts: the kinetic energy, which is due to atomic vibrations of the metallic lattice, and the potential energy...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410039
EISBN: 978-1-62708-265-5
... that promote such transformations and, in turn, how they affect the structure of various phases and the rate at which they form. The chapter also discusses the concepts of transformation kinetics, minimum free energy, and nucleation and growth, and provides information on alloying, interphase precipitation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2004
DOI: 10.31399/asm.tb.ps.t62440103
EISBN: 978-1-62708-352-2
... that the filler metal wets and spreads over the component surfaces. However, this situation represents the ideal case because oxides and other nonmetallic species are usually present on surfaces that have been exposed to ambient atmospheres and these will interfere with or inhibit wetting and alloying. Any oxygen...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2004
DOI: 10.31399/asm.tb.ps.t62440049
EISBN: 978-1-62708-352-2
..., section 5.1 . High-melting-point solders contain either gold or lead as the principal constituents. The majority of lower-melting-point solders, that is, those with melting points below 150 °C (300 °F), fall into two groups depending on whether the active constituent of the alloy is tin or indium...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420015
EISBN: 978-1-62708-310-2
... conductivity, high ductility, or good corrosion resistance are required. Because pure metals tend to be much weaker than alloys, alloying elements are added to improve strength and hardness. In addition, alloying element additions can often be accomplished without major reductions in the attributes associated...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.pb.t51230047
EISBN: 978-1-62708-351-5
... with it. Beryllium forms intermetallic compounds with the higher atomic weight metals that are major constituents of most brazing alloys, silver being an exception. But, the high temperatures required for silver-base brazes cause recrystallization of the beryllium and degradation of mechanical properties...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.tm.t52320001
EISBN: 978-1-62708-357-7
...: ultramicroscope 1900 High-strength steels Duralmin 18-8 stainless steel KS magnetic steel Æ Establishment of colloid science Zakariazen: glass structure Staudinger: advocate of polymer science Grain-oriented electromagnetic steel OP magnet Nylon 1950 Silicon transistor Shape memory alloy Microalloyed steel...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2016
DOI: 10.31399/asm.tb.ascaam.9781627082969
EISBN: 978-1-62708-296-9
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.tm.9781627083577
EISBN: 978-1-62708-357-7
Image
Published: 01 February 2022
Fig. 1 The fracture toughness vs. yield strength map of CrMnFeCoNi system HEAs and some high-strength materials. PTFE, polytetrafluoroethylene; PP, propylene; PS, polystyrene; PC, polycarbonate; PET, polyethylene terephthalate. Source: Ref 30 More
Image
Published: 01 February 2022
Fig. 2 The quantile lives predicted by the Weibull mixture predicative model. Source: Ref 56 More