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- W3141514460 abstract "Abstract Four multi-elemental Nb–Si based ultrahigh temperature alloys with compositions of Nb–22Ti–15Si–5Cr–3Al-2Hf-xV-yZr ((x, y) = (0, 0), (3, 0), (0, 4) and (3, 4)) (at.%) were prepared by vacuum non-consumable arc melting. The effects of single and combined additions of V and Zr on the microstructure, room temperature fracture toughness, microhardness and compressive yield strength and oxidation resistance at 1250 °C of the alloys have been investigated. The results show that the 0V–0Zr alloy is eutectic structure of NbSS/(Nb,X)5Si3, while the other three alloys are hypereutectic structure, mainly consisting of primary γ(Nb,X)5Si3 blocks and NbSS/(Nb,X)5Si3 eutectic. Alloying with V and Zr can suppress the formation of α(Nb,X)5Si3 and promote the formation of γ(Nb,X)5Si3. The room temperature fracture toughness of the alloys is improved by single addition of V or Zr, and is markedly improved by the composite additions of V and Zr. The microhardness of γ(Nb,X)5Si3 is enhanced by the solid solution strengthening of V and Zr addition, while that of NbSS is reduced by the solid solution softening of V addition. The compressive yield strength at 1250 °C of the alloys reduces with V addition while increases with Zr addition, and the alloy with composite additions of V and Zr shows the highest compressive yield strength. The single additions of V or Zr can ameliorate, but the composite additions of V and Zr degrade the oxidation resistant performance at 1250 °C." @default.
- W3141514460 created "2021-04-13" @default.
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- W3141514460 date "2021-05-01" @default.
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- W3141514460 title "Composite alloying effects of V and Zr on the microstructures and properties of multi-elemental Nb–Si based ultrahigh temperature alloys" @default.
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