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

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Chinese Library Classification Number:TG132[一般工业技术—材料科学与工程]

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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 TiZrNbV_xLRMPEAs 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_0.6LRMPEA 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.