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Delivering strong and ductile light refractory multi-principal element alloys via tailoring compositional inhomogeneity
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DOI：10.1007/s42864-025-00322-3.png)
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Abstract
En 中文
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 similar to 5 nm. Then the dislocations in TiZrNbV0.6 LRMPEA are compactly pinned, a remarkable strengthening effect (similar to 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.
Keywords:
TiZrNbVx
Refractory multi-principal element alloys
Compositional inhomogeneity
Mechanical properties
Compositional fluctuation
Spinodal decomposition
Journal
IF:
11.2
Papers:
362
Citations:
2.0K