Grain Boundary Wetting by a Second Solid Phase in the High Entropy Alloys: A Review

Straumal, Boris B.; Korneva, Anna; López, Gabriel A.; Kuzmin, Alexei; Rabkin, Eugen; Gerstein, Gregory; Страумал, А. Б.; Горнакова, А. С.

doi:10.3390/ma14247506

Cited by 30 publications

(4 citation statements)

References 78 publications

(125 reference statements)

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“…For the Zr_5 and Zr_20 samples, the dendritic phase's elongation was revealed compared to the Zr_10 and Zr_15 samples, where a characteristic dendritic structure was confirmed. For all the studied HEAs, the separation of the BCC2 phase corresponding to the interdendritic region from the dendritic region was also observed and corresponds to the grain boundary wetting phenomena described by Cahn and Straumal et al [42][43][44][45]. Our previous work also observed grain boundary wetting for different Mocontaining high-entropy alloys [27].…”

Section: Sem Microstructure and Eds Chemical Composition Analysis Of ...supporting

confidence: 80%

Influence of Zirconium on the Microstructure, Selected Mechanical Properties, and Corrosion Resistance of Ti20Ta20Nb20(HfMo)20−xZrx High-Entropy Alloys

Glowka,

Zubko,

Świec

et al. 2024

Materials

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The presented work considers the influence of the hafnium and molybdenum to zirconium ratio of Ti20Ta20Nb20(HfMo)20−xZrx (where x = 0, 5, 10, 15, 20 at.%) high-entropy alloys in an as-cast state for potential biomedical applications. The current research continues with our previous results of hafnium’s and molybdenum’s influence on a similar chemical composition. In the presented study, the microstructure, selected mechanical properties, and corrosion resistance were investigated. The phase formation thermodynamical calculations were also applied to predict solid solution formation after solidification. The calculations predicted the presence of multi-phase, body-centred cubic phases, confirmed using X-ray diffraction and scanning electron microscopy. The chemical composition analysis showed the segregation of alloying elements. Microhardness measurements revealed a decrease in microhardness with increased zirconium content in the studied alloys. The corrosion resistance was determined in Ringer’s solution to be higher than that of commercially applied biomaterials. The comparison of the obtained results with previously reported data is also presented and discussed in the presented study.

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Section: Sem Microstructure and Eds Chemical Composition Analysis Of ...supporting

confidence: 80%

Influence of Zirconium on the Microstructure, Selected Mechanical Properties, and Corrosion Resistance of Ti20Ta20Nb20(HfMo)20−xZrx High-Entropy Alloys

Glowka,

Zubko,

Świec

et al. 2024

Materials

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“…As can be seen in Figure 4 , the interdimeric BCC2 phase separates from each other dendritic grains of the BCC1 phase. Based on the grain boundary wetting theory described by J. W. Cahn [ 60 ] and further studied by Straumal et al [ 61 , 62 , 63 ] such observation indicates that during the solidification process the molten metal completely separates the majority of BCC1 primary grains from each other. Grain boundaries of BCC1 phase were completely wetted by the mold.…”

Section: Resultsmentioning

confidence: 99%

Influence of Molybdenum on the Microstructure, Mechanical Properties and Corrosion Resistance of Ti20Ta20Nb20(ZrHf)20−xMox (Where: x = 0, 5, 10, 15, 20) High Entropy Alloys

et al. 2022

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The presented work was focused on investigating the influence of the (hafnium and zirconium)/molybdenum ratio on the microstructure and properties of Ti20Ta20Nb20(ZrHf)20−xMox (where: x = 0, 5, 10, 15, 20 at.%) high entropy alloys in an as-cast state. The designed chemical composition was chosen due to possible future biomedical applications. Materials were obtained from elemental powders by vacuum arc melting technique. Phase analysis revealed the presence of dual body-centered cubic phases. X-ray diffraction showed the decrease of lattice parameters of both phases with increasing molybdenum concentration up to 10% of molybdenum and further increase of lattice parameters. The presence of two-phase matrix microstructure and hafnium and zirconium precipitates was proved by scanning and transmission electron microscopy observation. Mechanical property measurements revealed decreased micro- and nanohardness and reduced Young’s modulus up to 10% of Mo content, and further increased up to 20% of molybdenum addition. Additionally, corrosion resistance measurements in Ringers’ solution confirmed the high biomedical ability of studied alloys due to the presence of stable oxide layers.

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“…Especially promising can be the way from single-phase HEAs towards two-or multiple-phase ones. In particular, one can use the phenomenon of grain boundary (GB) wetting already observed in HEAs [82][83][84]. The application of GB wetting allows us to purposely arrange the second phase in HEAs along GBs in the form of continuous layers or regular chains of lenticular precipitates.…”

Section: Discussionmentioning

confidence: 99%

WC-Based Cemented Carbides with High Entropy Alloyed Binders: A Review

Straumal

Konyashin

2023

Metals

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Cemented carbides have belonged to the most important engineering materials since their invention in the 1920s. Commonly, they consist of hard WC grains embedded in a cobalt-based ductile binder. Recently, attempts have been made to substitute the cobalt using multicomponent alloys without a principal component (also known as high entropy alloys—HEAs). HEAs usually contain at least five components in more or less equal amounts. The substitution of a cobalt binder with HEAs can lead to the refinement of WC grains; it increases the hardness, fracture toughness, corrosion resistance and oxidation resistance of cemented carbides. For example, a hardness of 2358 HV, fracture toughness of 12.1 MPa.m1/2 and compression strength of 5420 MPa were reached for a WC-based cemented carbide with 20 wt.% of the equimolar AlFeCoNiCrTi HEA with a bcc lattice. The cemented carbide with 10 wt.% of the Co27.4Cr13.8Fe27.4Ni27.4Mo4 HEA with an fcc lattice had a hardness of 2141 HV and fracture toughness of 10.5 MPa.m1/2. These values are higher than those for the typical WC–10 wt.% Co composite. The substitution of Co with HEAs also influences the phase transitions in the binder (between the fcc, bcc and hcp phases). These phase transformations can be successfully used for the purposeful modifications of the properties of the WC-HEA cemented carbides. The shape of the WC/binder interfaces (e.g., their faceting–roughening) can influence the mechanical properties of cemented carbides. The most possible reason for such a behavior is the modification of conditions for dislocation glide as well as the development and growth of cracks at the last stages of deformation. Thus, the substitution of a cobalt binder with HEAs is very promising for the further development of cemented carbides.

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Grain Boundary Wetting by a Second Solid Phase in the High Entropy Alloys: A Review

Cited by 30 publications

References 78 publications

Influence of Zirconium on the Microstructure, Selected Mechanical Properties, and Corrosion Resistance of Ti20Ta20Nb20(HfMo)20−xZrx High-Entropy Alloys

Influence of Zirconium on the Microstructure, Selected Mechanical Properties, and Corrosion Resistance of Ti20Ta20Nb20(HfMo)20−xZrx High-Entropy Alloys

Influence of Molybdenum on the Microstructure, Mechanical Properties and Corrosion Resistance of Ti20Ta20Nb20(ZrHf)20−xMox (Where: x = 0, 5, 10, 15, 20) High Entropy Alloys

WC-Based Cemented Carbides with High Entropy Alloyed Binders: A Review

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