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• W4229041323 endingPage "165295" @default.
• W4229041323 startingPage "165295" @default.
• W4229041323 abstract "Recently, it has been a hot topic to explore lightweight high entropy alloys (HEAs) for their future potential application as engineering materials. In this work, novel lightweight Ti 22 Sc 22 Zr 22 Nb 17 V 17 , Ti 24 Sc 20 Zr 22 Nb 17 V 17 , Ti 24 Sc 22 Zr 20 Nb 17 V 17 , and Ti 26 Sc 20 Zr 20 Nb 17 V 17 HEAs were fabricated by rapid solidification. The phase constituents and microstructures of the HEAs in the cast and annealed states were characterized by X-ray diffraction spectrum (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), and energy dispersive spectrum (EDS), while their mechanical properties were also investigated in detail. The microstructures of the cast samples consist of the coarse equiaxed BCC dendrites with extremely heterogeneous chemical distributions and the intergranular structures that are made up of BCC and HCP precipitates. Both precipitates inside the intergranular structures exhibit slightly large worm-shaped and fine lamellar morphology features. After annealing at temperatures below 1273 K, the desolvation reaction occurs due to the strong solute redistribution, leading to the disappearance of the lamellar structures, the coarsening of the large worm-shaped BCC particles, and the solid phase separation of the equiaxed BCC dendrites. At 1273 K, the combined interaction from the eutectoid transformation and phase separation leads to the formation of the TiNbV-rich BCC, ScZr-rich HCP, and transitional BCC+HCP structures. Compared with reported lightweight HEAs (density ≤ 6.5 g/cm 3 ), the present HEAs in the cast and annealed states exhibit excellent comprehensive mechanical properties, which are attributed to the combined effect from the solid-solution strengthening, second phase strengthening, and fine-grained strengthening. The present studies provide potential candidates as lightweight high-temperature structural materials in the future. • Compositional variations and heat treatments on structure and properties of as-cast lightweight HEAs were investigated. • Phase types are well consistent with the calculation prediction. • Dendritic intergranular regions contain some worm-shaped and fine lamellar BCC particles and HCP precipitates. • Low-temperature annealing induces strong solute redistribution within BCC and HCP phases. • Annealing at 1273 K induces the eutectoid transformation and phase separation." @default.
• W4229041323 created "2022-05-08" @default.
• W4229041323 creator A5008527055 @default.
• W4229041323 creator A5009201642 @default.
• W4229041323 creator A5041360216 @default.
• W4229041323 creator A5054202053 @default.
• W4229041323 creator A5067195360 @default.
• W4229041323 creator A5076383947 @default.
• W4229041323 creator A5077109430 @default.
• W4229041323 creator A5079783112 @default.
• W4229041323 creator A5080260853 @default.
• W4229041323 date "2022-09-01" @default.
• W4229041323 modified "2023-10-16" @default.
• W4229041323 title "Structure-property relations of lightweight Ti-Sc-Zr-Nb-V high-entropy alloys" @default.
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