Behaviors and interactions of strengthening and constraint for ductile Nbss matrix in Nb–Si based alloys

Wang, Yu; Ye, Chengtong; Sun, Guangxin; Zhang, Hu

doi:10.1016/j.pnsc.2022.01.011

Cited by 5 publications

(1 citation statement)

References 38 publications

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“…The Nb 5 Si 3 intermetallic compound has been considered as a potential material for high-performance structural application due to its high melting point (2520 • C), low density (7.1 g/cm 3 ), and excellent strength retention at elevated temperatures [1][2][3]. 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].…”

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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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