On the Alloying and Properties of Tetragonal Nb₅Si₃ in Nb-Silicide Based Alloys

Materials
Panos Tsakiropoulos

Abstract

The alloying of Nb₅Si₃ modifies its properties. Actual compositions of (Nb,TM)₅X₃ silicides in developmental alloys, where X = Al + B + Ge + Si + Sn and TM is a transition and/or refractory metal, were used to calculate the composition weighted differences in electronegativity (Δχ) and an average valence electron concentration (VEC) and the solubility range of X to study the alloying and properties of the silicide. The calculations gave 4.11 < VEC < 4.45, 0.103 < Δχ < 0.415 and 33.6 < X < 41.6 at.%. In the silicide in Nb-24Ti-18Si-5Al-5Cr alloys with single addition of 5 at.% B, Ge, Hf, Mo, Sn and Ta, the solubility range of X decreased compared with the unalloyed Nb₅Si₃ or exceeded 40.5 at.% when B was with Hf or Mo or Sn and the Δχ decreased with increasing X. The Ge concentration increased with increasing Ti and the Hf concentration increased and decreased with increasing Ti or Nb respectively. The B and Sn concentrations respectively decreased and increased with increasing Ti and also depended on other additions in the silicide. The concentration of Sn was related to VEC and the concentrations of B and Ge were related to Δχ. The alloying of Nb₅Si₃ was demonstrated in Δχ versus VEC maps. Effects of alloying on the coefficien...Continue Reading

References

Jul 9, 2008·Journal of Physics. Condensed Matter : an Institute of Physics Journal·U MizutaniT Takeuchi
Jul 26, 2017·Science and Technology of Advanced Materials·Ioannis PapadimitriouPanos Tsakiropoulos

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Citations

Jun 6, 2019·Materials·Ofelia Hernández-Negrete, Panos Tsakiropoulos
May 23, 2018·Materials·Panos Tsakiropoulos

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