New advances in high-entropy alloys

• Main Author: Zhang, Yong
• Format: eBook Book
• Language: English
• Published: Basel MDPI 2020; MDPI - Multidisciplinary Digital Publishing Institute
• Subjects: (AlCrTiZrV)-Six-N films; (CoCrFeNi)100−xMox alloys; ab initio; additive manufacturing; alloy design; alloys design; annealing; annealing treatment; atom probe tomography; atomic-scale unstable; AZ91D magnesium alloy; bcc; bulk metallic glass; CALPHAD; CCA; CCAs; cluster expansion; cluster variation method; coating; coherent microstructure; complex concentrated alloys; complex stress field; composite; composition scanning; compositionally complex alloy; compositionally complex alloys; compressive properties; configuration entropy; conventional alloys; corrosion; corrosion behavior; creep mechanism; CrFeCoNi(Nb; Curie temperature; deformation; deformation and fracture; deformation behaviors; deformation mechanism; density functional theory; diamond; differential scanning calorimetry (DSC); elastic property; electron microscopy; elemental addition; elemental partitioning; elemental powder; elevated-temperature yield strength; elongation prediction; entropy; eutectic dendrites; first-principles calculation; first-principles calculations; flow serration; gamma double prime nanoparticles; graded material; grain refinement; Hall–Petch (H–P) effect; hardening behavior; hardness; HEA; HEAs; heat-softening resistance; hierarchical nanotwins; high entropy alloy; high entropy alloys; high pressure; high-entropy alloy coating; high-entropy alloys (HEAs); high-entropy ceramic; high-entropy film; high-entropy films; high-pressure torsion; high-temperature structural alloys; immiscible alloys; in situ X-ray diffraction; interface; interstitial phase; ion irradiation; kinetics; laser cladding; laser metal deposition; lattice constants; lattice distortion; lightweight alloys; liquid phase separation; low-activation alloys; low-activation high-entropy alloys (HEAs); magnetic properties; magnetic property; matrix formulation; maximum entropy; mechanical alloying; mechanical behaviors; mechanical characterization; mechanical properties; mechanical property; medium entropy alloy; medium entropy alloys; metal matrix composites; microhardness; microstructural evolution; microstructure; microstructures; miscibility gaps; Mo; monte carlo; MPEAs; multi-principal element alloys; multicomponent; multicomponent alloys; nanocomposite structure; nanocrystalline; nanocrystalline materials; nanodisturbances; nanoprecipitates; nanoscaled high-entropy alloys; partial recrystallization; phase composition; phase constituent; phase constitution; phase evolution; phase stability; phase structures; phase transformation; phase transformations; phase transition; plasticity; plasticity methods; polymorphic transition; powder metallurgy; precipitation; precipitation kinetics; recrystallization; Reference, Information and Interdisciplinary subjects; refractory high entropy alloys; Research and information: general; scandium effect; serration behavior; shear band; sodium chloride; solid solution strengthening effect; solid-solution; solid-solution alloys; solid-state diffusion; solidification; spark plasma sintering; specific heat; sputtering; stacking-fault energy; strain rate sensitivity; strengthening; strengthening mechanisms; structural metals; sulfuric acid; tensile creep behavior; tensile strength; thermal expansion; thermodynamic integration; thermoelectric properties; thin films; transmission electron microscopy; volume swelling; wear; wear behaviour; welding
• ISBN: 9783039436194; 3039436198; 3039436201; 9783039436200
• DOI: 10.3390/books978-3-03943-620-0

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.