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<p>To improve strength and ductility of Ti–Zr–Nb lightweight refractory multi-principal element alloys (LRMPEAs) simultaneously, which is difficult for traditional solution strengthening and second-phase/precipitate strengthening, the compositional inhomogeneity in TiZrNb ternary equimolar LRMPEAs with a single-phased body-centered cubic structure is stimulated and tailored by doping V element. When V is introduced, compositional inhomogeneity shows as the segregation of V and Zr elements form. As the value of <i>x</i> for TiZrNbV<sub><i>x</i></sub> LRMPEAs increases from 0.3 to 0.6, the mild compositional fluctuation develops to the spinodal decomposition structured three-dimensional framework with a periodicity of ~ 5 nm. Then the dislocations in TiZrNbV<sub>0.6</sub> LRMPEA are compactly pinned, a remarkable strengthening effect (~ 120 MPa) while the Frank–Read sources for dislocation multiplication and cross-slip are stimulated. Thus, an optimal combination of strength and ductility including the yield strength of 883 MPa and the fracture elongation of 26.6% is achieved in TiZrNbV<sub>0.6</sub> LRMPEA. This work provides a useful method to enhance the strength of Ti–Zr–Nb LRMPEAs without sacrificing the ductility. This way is expected to be effective for other multi-principal element alloys, including high-entropy alloys and medium-entropy alloys.</p>

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Delivering strong and ductile light refractory multi-principal element alloys via tailoring compositional inhomogeneity

  • 期刊论文

  • 发表日期：

    2025年4月9日

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  • Yi-Jing Fan,
  • Wei-Jian Shen,
  • Rui-Xin Wang,
  • Yong-Kang Li,
  • Yu Tang,
  • Shun Li,
  • Shu-Xin Bai

摘要

To improve strength and ductility of Ti–Zr–Nb lightweight refractory multi-principal element alloys (LRMPEAs) simultaneously, which is difficult for traditional solution strengthening and second-phase/precipitate strengthening, the compositional inhomogeneity in TiZrNb ternary equimolar LRMPEAs with a single-phased body-centered cubic structure is stimulated and tailored by doping V element. When V is introduced, compositional inhomogeneity shows as the segregation of V and Zr elements form. As the value of x for TiZrNbVx LRMPEAs increases from 0.3 to 0.6, the mild compositional fluctuation develops to the spinodal decomposition structured three-dimensional framework with a periodicity of ~ 5 nm. Then the dislocations in TiZrNbV0.6 LRMPEA are compactly pinned, a remarkable strengthening effect (~ 120 MPa) while the Frank–Read sources for dislocation multiplication and cross-slip are stimulated. Thus, an optimal combination of strength and ductility including the yield strength of 883 MPa and the fracture elongation of 26.6% is achieved in TiZrNbV0.6 LRMPEA. This work provides a useful method to enhance the strength of Ti–Zr–Nb LRMPEAs without sacrificing the ductility. This way is expected to be effective for other multi-principal element alloys, including high-entropy alloys and medium-entropy alloys.