Excellent dynamic shear resistance and high dynamic plasticity in TiZrVNbAl multicomponent alloy via high content orthorhombic phase

Tianxiang Li, Xutao Wang, Benpeng Wang*, Ke Jin, Xudong Liu, Liang Wang, Hanlin Zeng, Yunfei Xue

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

摘要

Premature adiabatic shear localization caused by strain softening is a roadblock for the application of body-centered cubic (BCC) structured high-entropy alloy (HEAs) in the impact field. A micron-scale orthorhombic-phase (O-phase) strengthened TiZrVNbAl alloy was developed to delay adiabatic shear failure and enhance dynamic ductility. The O-phase can not only reduce the slip length, but also promote the pinning and tangling of the dislocations near the phase boundaries. The introduction of the O-phase transformed the strain hardening rate from negative to positive, resulting in a significantly improved dynamic shear resistance. Meanwhile, slip transfer across the O-phase via dislocation cutting mechanisms and a reduction of slip band spacing guaranteed dynamic deformation uniformity. Benefiting from the introduction of the O-phase, the alloy exhibits an excellent stored energy density (∼446 J/cm3, surpass the reported BCC-HEAs and typical titanium alloys), a large dynamic fracture strain (∼42 %) and a considerable dynamic specific yield strength (∼241 MPa cm3 g1). The present study presents an effective approach for developing BCC-HEAs with excellent dynamic shear resistance and plasticity.

源语言英语
页(从-至)53-61
页数9
期刊Journal of Materials Science and Technology
214
DOI
出版状态已出版 - 10 4月 2025

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引用此

Li, T., Wang, X., Wang, B., Jin, K., Liu, X., Wang, L., Zeng, H., & Xue, Y. (2025). Excellent dynamic shear resistance and high dynamic plasticity in TiZrVNbAl multicomponent alloy via high content orthorhombic phase. Journal of Materials Science and Technology, 214, 53-61. https://doi.org/10.1016/j.jmst.2024.05.082