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New Advances in High-Entropy Alloys
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Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

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.

Keywords

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


Book
New Advances in High-Entropy Alloys
Author:
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

Loading...
Export citation

Choose an application

Bookmark

Abstract

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.

Keywords

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

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