New Advances in High-Entropy Alloys

• Other Authors: Zhang, Yong (Editor)
• Format: Electronic Book Chapter
• Language: English
• Published: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute 2021
• Subjects: Research & information: general; high-entropy alloys; alloys design; lightweight alloys; high entropy alloys; elemental addition; annealing treatment; magnetic property; microhardness; in situ X-ray diffraction; grain refinement; thermoelectric properties; scandium effect; HEA; high-entropy alloy; CCA; compositionally complex alloy; phase composition; microstructure; wear behaviour; metal matrix composites; mechanical properties; high-entropy films; phase structures; hardness; solid-solution; interstitial phase; transmission electron microscopy; compositionally complex alloys; CrFeCoNi(Nb,Mo); corrosion; sulfuric acid; sodium chloride; entropy; multicomponent; differential scanning calorimetry (DSC); specific heat; stacking-fault energy; density functional theory; nanoscaled high-entropy alloys; nanodisturbances; phase transformations; atomic-scale unstable; mechanical alloying; spark plasma sintering; nanoprecipitates; annealing; phase constituent; ion irradiation; hardening behavior; volume swelling; medium entropy alloy; high-pressure torsion; partial recrystallization; tensile strength; high-entropy alloys (HEAs); phase constitution; magnetic properties; Curie temperature; phase transition; precipitation; strengthening; coherent microstructure; conventional alloys; nanocrystalline materials; high entropy alloy; sputtering; deformation and fracture; strain rate sensitivity; liquid phase separation; immiscible alloys; HEAs; multicomponent alloys; miscibility gaps; multi-principal element alloys; MPEAs; complex concentrated alloys; CCAs; electron microscopy; plasticity methods; plasticity; serration behavior; alloy design; structural metals; CALPHAD; solid-solution alloys; lattice distortion; phase transformation; (CoCrFeNi)100−xMox alloys; corrosion behavior; gamma double prime nanoparticles; elemental partitioning; atom probe tomography; first-principles calculations; bcc; phase stability; composition scanning; laser cladding; high-entropy alloy coating; AZ91D magnesium alloy; wear; kinetics; deformation; thermal expansion; diamond; composite; powder metallurgy; additive manufacturing; low-activation high-entropy alloys (HEAs); high-temperature structural alloys; microstructures; compressive properties; heat-softening resistance; tensile creep behavior; microstructural evolution; creep mechanism; first-principles calculation; maximum entropy; elastic property; mechanical property; recrystallization; laser metal deposition; elemental powder; graded material; refractory high-entropy alloys; elevated-temperature yield strength; solid solution strengthening effect; bulk metallic glass; complex stress field; shear band; flow serration; deformation mechanism; ab initio; configuration entropy; matrix formulation; cluster expansion; cluster variation method; monte carlo; thermodynamic integration; (AlCrTiZrV)-Six-N films; nanocomposite structure; refractory high entropy alloys; medium entropy alloys, mechanical properties; thin films; deformation behaviors; nanocrystalline; coating; interface; mechanical characterization; high pressure; polymorphic transition; solidification; eutectic dendrites; hierarchical nanotwins; precipitation kinetics; strengthening mechanisms; elongation prediction; welding; Hall-Petch (H-P) effect; lattice constants; high-entropy ceramic; solid-state diffusion; phase evolution; mechanical behaviors; high-entropy film; low-activation alloys
• Online Access: DOAB: download the publication; DOAB: description of the publication

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.