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<p>A novel (FeCrCoNi)<sub>100-x</sub> Nb<sub>x</sub> alloy with both high damping capacity and excellent corrosion resistance was designed and fabricated. By adding Nb to the FeCrCoNi alloy, the effects of Nb content on the damping properties, mechanical properties, and corrosion resistance of the alloy were systematically investigated. The results show that when the Nb content is 1&#xa0;at.%, Nb atoms are dissolved in the alloy matrix in a solid solution state, and the alloy exhibits a single face-centered cubic (FCC) structure. When the Nb content increases to 3 and 5&#xa0;at.%, a large number of Nb-rich Laves phases precipitate on the FCC matrix. Nb content exerts a significant regulatory effect on the alloy’s damping properties, mechanical properties, and corrosion resistance: At 1&#xa0;at.% Nb, the alloy achieves a yield strength of 284&#xa0;MPa. The lattice distortion caused by Nb solid solution forms weak pinning on dislocation motion, endowing the alloy with optimal damping performance—with an internal friction value (Q<sup>−1</sup>) of up to 0.042 at a strain amplitude of 10<sup>−3</sup>. When the Nb content further increases to 3 and 5&#xa0;at.%, the massive Laves phase particles precipitated in the alloy form strong pinning on dislocations, reducing the Q<sup>−1</sup> values to 0.027 and 0.02, respectively. However, the precipitation of Laves phases significantly enhances the alloy strength, with the yield strength increasing to 426 and 834&#xa0;MPa accordingly. In NaCl solution, appropriate Nb addition improves corrosion resistance: The alloy with 3&#xa0;at.% Nb shows a wider passivation interval. Nevertheless, when Nb content rises to 5&#xa0;at.%, the increased content and size of the Laves second phase lead to deteriorated corrosion resistance.</p>

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Study of a Novel (FeCrCoNi)100-xNbx High-Damping Alloy with Excellent Corrosion Resistance

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Zhanming Zhou,
  • Wenjun Cui,
  • Donglai Li,
  • Lingyao Sun

摘要

A novel (FeCrCoNi)100-x Nbx alloy with both high damping capacity and excellent corrosion resistance was designed and fabricated. By adding Nb to the FeCrCoNi alloy, the effects of Nb content on the damping properties, mechanical properties, and corrosion resistance of the alloy were systematically investigated. The results show that when the Nb content is 1 at.%, Nb atoms are dissolved in the alloy matrix in a solid solution state, and the alloy exhibits a single face-centered cubic (FCC) structure. When the Nb content increases to 3 and 5 at.%, a large number of Nb-rich Laves phases precipitate on the FCC matrix. Nb content exerts a significant regulatory effect on the alloy’s damping properties, mechanical properties, and corrosion resistance: At 1 at.% Nb, the alloy achieves a yield strength of 284 MPa. The lattice distortion caused by Nb solid solution forms weak pinning on dislocation motion, endowing the alloy with optimal damping performance—with an internal friction value (Q−1) of up to 0.042 at a strain amplitude of 10−3. When the Nb content further increases to 3 and 5 at.%, the massive Laves phase particles precipitated in the alloy form strong pinning on dislocations, reducing the Q−1 values to 0.027 and 0.02, respectively. However, the precipitation of Laves phases significantly enhances the alloy strength, with the yield strength increasing to 426 and 834 MPa accordingly. In NaCl solution, appropriate Nb addition improves corrosion resistance: The alloy with 3 at.% Nb shows a wider passivation interval. Nevertheless, when Nb content rises to 5 at.%, the increased content and size of the Laves second phase lead to deteriorated corrosion resistance.