“…The diffraction peaks of the samples sintered at 40°, 58° and 73° from the (110), (200), and (211) planes, respectively, confirm the presence of a BCC crystal structure, as observed previously in sintered refractory alloys 53 and HEAs 103, 133 due to the high degree of mutual solubility of their constituents 134, 135 . The presence of intermetallics in HEAs is well known 89, 93 ; however, the low volume fraction of intermetallics prevents XRD patterns from giving any indication of their presence.…”
Section: Resultssupporting
confidence: 84%
“…The chemical nature, analyzed via point energy-dispersive spectroscopy (EDS), revealed the enrichment of Ti and W in the dark and bright regions of the microstructures, respectively. No indication of a Ti-rich phase, which indicates a hexagonal-close-packed (HCP) crystal structure in a W-Ti alloy, was observed in the XRD patterns 53 .Figure 1SEM micrographs of the xW s samples sintered at 1600 °C.
…”
The WxTaTiVCr high-entropy alloy with 32at.% of tungsten (W) and its derivative alloys with 42 to 90at.% of W with in-situ TiC were prepared via the mixing of elemental W, Ta, Ti, V and Cr powders followed by spark plasma sintering for the development of reduced-activation alloys for fusion plasma-facing materials. Characterization of the sintered samples revealed a BCC lattice and a multi-phase structure. The selected-area diffraction patterns confirmed the formation of TiC in the high-entropy alloy and its derivative alloys. It revealed the development of C15 (cubic) Laves phases as well in alloys with 71 to 90at.% W. A mechanical examination of the samples revealed a more than twofold improvement in the hardness and strength due to solid-solution strengthening and dispersion strengthening. This study explored the potential of powder metallurgy processing for the fabrication of a high-entropy alloy and other derived compositions with enhanced hardness and strength.
“…The diffraction peaks of the samples sintered at 40°, 58° and 73° from the (110), (200), and (211) planes, respectively, confirm the presence of a BCC crystal structure, as observed previously in sintered refractory alloys 53 and HEAs 103, 133 due to the high degree of mutual solubility of their constituents 134, 135 . The presence of intermetallics in HEAs is well known 89, 93 ; however, the low volume fraction of intermetallics prevents XRD patterns from giving any indication of their presence.…”
Section: Resultssupporting
confidence: 84%
“…The chemical nature, analyzed via point energy-dispersive spectroscopy (EDS), revealed the enrichment of Ti and W in the dark and bright regions of the microstructures, respectively. No indication of a Ti-rich phase, which indicates a hexagonal-close-packed (HCP) crystal structure in a W-Ti alloy, was observed in the XRD patterns 53 .Figure 1SEM micrographs of the xW s samples sintered at 1600 °C.
…”
The WxTaTiVCr high-entropy alloy with 32at.% of tungsten (W) and its derivative alloys with 42 to 90at.% of W with in-situ TiC were prepared via the mixing of elemental W, Ta, Ti, V and Cr powders followed by spark plasma sintering for the development of reduced-activation alloys for fusion plasma-facing materials. Characterization of the sintered samples revealed a BCC lattice and a multi-phase structure. The selected-area diffraction patterns confirmed the formation of TiC in the high-entropy alloy and its derivative alloys. It revealed the development of C15 (cubic) Laves phases as well in alloys with 71 to 90at.% W. A mechanical examination of the samples revealed a more than twofold improvement in the hardness and strength due to solid-solution strengthening and dispersion strengthening. This study explored the potential of powder metallurgy processing for the fabrication of a high-entropy alloy and other derived compositions with enhanced hardness and strength.
“…W-Cr, W-Re, W-Ta, W-Ti, W-V) or nanostructure engineered W are being investigated to improve the material processing and working properties to extreme irradiation environments. [10][11][12][13][14][15][16][17][18][19][20] Despite these significant efforts from both experimental and modelling investigations, detailed studies of conventional binary alloys revealed several constrains and limitations. For example, some of W-based binary alloys were found to deteriorate the mechanical properties 5,14,21 whereas for other systems such as W-Re, W-Os, transmutation induced precipitations were observed under neutron irradiation.…”
The development of High-Entropy Alloys (HEAs) focuses on exploring compositional regions in multi-component systems with all alloy elements in equal or near-equal atomic concentrations. Initially it was based on the...
“…Figure shows the crystallographic properties of the AGAed powder and the MAed powder. The coherently diffracting domain size and microstrain are estimated by the full width at half maximum (FWHM) of the main diffraction peaks and the Scherrer's and Williamson‐Hall equations . The coherently diffracting domain size of MAed powder was about 16 times finer than the AGAed powder.…”
A bimodal grain structure Ti-22Al-25Nb alloy with enhanced ductility is fabricated from the blended powder mixture of argon gas atomized powder and mechanically alloyed powder by spark plasma sintering. The microstructure of the bimodal grain structure Ti-22Al-25Nb alloy and the effects of the argon gas atomized powder mass fraction on the compression properties are investigated. This alloy shows the bimodal microstructure, which the coarse grain regions are surrounded by the ultrafine grained matrix. Compared with the Ti-22Al-25Nb alloy sintered from 100% mechanically alloyed powder, this alloy sintered from the blended powder mixture containing 20% argon gas atomized powder exhibits the fracture elongation to improve 20.5%.1600804 (1 of 8)
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