Effects of Si variation and Zr addition on the microstructure, oxidation resistance and mechanical property at 1523 K of Nb-Si-Ti/Zr/Hf-Cr/Al high-entropy superalloys

Fan, Zijun; Niu, Ben; Wang, Qing; Sha, Jianjun; Chen, Dong

doi:10.1016/j.jallcom.2023.169304

Cited by 10 publications

(1 citation statement)

References 44 publications

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“…However, due to the relatively low fracture toughness of 1-3 MPa•m 1/2 at ambient temperatures [4], a ductile niobium-based solid solution (Nb ss ) was brought into Nb 5 Si 3 to achieve a balance of low fracture toughness and high temperature strength [5][6][7][8][9][10][11][12]. As for the as-cast Nb-Si alloy, with the increase in Si content, the volume fraction of ductile Nb ss phase decreased, thereby significantly lowering the fracture toughness [13,14]. It was reported that the fracture toughness of Nb-10Si and Nb-16Si alloys were 12 MPa•m 1/2 and 4.5 MPa•m 1/2 , respectively [15].…”

Section: Introductionmentioning

confidence: 99%

Effect of C Addition on the Microstructure and Fracture Properties of In Situ Laminated Nb/Nb5Si3 Composites

Zeng

Xiao

et al. 2023

Materials

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//Nbss and α-Nb5Si3 phases were detected. Meanwhile, Nb2C was observed, and the crystal forms of Nb5Si3 changed in the C-doped composites. Furthermore, micron-sized and nano-sized Nb2C particles were found in the Nbss layer. The orientation relationship of Nb2C phase and the surrounding Nbss was [001]Nbss//[010]Nb2C, (200) Nbss//(101) Nb2C. Additionally, with the addition of C, the compressive strength of the composites, at 1400 °C, and the fracture toughness increased from 310 MPa and 11.9 MPa·m1/2 to 330 MPa and 14.2 MPa·m1/2, respectively; the addition of C mainly resulted in solid solution strengthening.

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