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- W4283020106 abstract "Four Nb Si based ultrahigh temperature alloys with compositions of Nb-16Si-20Ti-1ZrC- x ZrB 2 ( x = 0, 0.5, 1, 3) (at.%) were prepared by vacuum non-consumable arc melting. The microstructure evolution, fracture toughness, and fracture behavior of four alloys were investigated. Results showed that four alloys consisted of Nbss, γ-(Nb,X) 5 Si 3, and (Nb,X) 3 Si phases. The low content of ZrB 2 facilitates the disintegration of (Nb,X) 3 Si, while the high content of ZrB 2 stabilizes (Nb,X) 3 Si. The maze-like Nbss/γ-(Nb,X) 5 Si 3 eutectic structure forms in Nb-16Si-20Ti-1ZrC-0.5ZrB 2 alloy. With the increase of ZrB 2 content, the room-temperature fracture toughness of Nb-Si-Ti-ZrC-based alloy increases and decreases. When the addition amount of ZrB 2 is 0.5 at.%, the room-temperature fracture toughness is the largest of 18.4 MPa·m 1/2 , and the fracture mode changes from quasi-cleavage fracture to dimple fracture. Compared with the base alloy, it is increased by 28%. It is the highest value of as-cast arc melting that has been reported so far. The maze-like eutectic of the high content of Nbss (54.9 ± 5.9%) phase promotes the formation of microcracks and inhibits the propagation of cracks in Nb-16Si-20Ti-1ZrC-0.5ZrB 2 alloy. • The maze-like Nbss/γ-(Nb,X) 5 Si 3 eutectic structure forms in Nb-16Si-20Ti-1ZrC-0.5ZrB 2 alloy. • Fracture toughness was increased to 18.4 MPa·m 1/2 by addition of 0.5% ZrB 2 . • The Nb-16Si-20Ti-1ZrC-0.5ZrB 2 alloy is a ductile dimple fracture." @default.
- W4283020106 created "2022-06-18" @default.
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- W4283020106 date "2022-11-01" @default.
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- W4283020106 title "A study on fine Nbss/γ-(Nb,X)5Si3 eutectic with significantly improved room-temperature fracture toughness by added ZrB2" @default.
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- W4283020106 doi "https://doi.org/10.1016/j.ijrmhm.2022.105935" @default.
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