Precipitation enhancing strain hardening capability of ductile AlTiVZrNb high-entropy alloys upon dynamic loading

Xutao Wang, Liang Wang, Tianxiang Li, Ke Jin, Benpeng Wang*, Yunkai Li, Shihai Sun, Yunfei Xue

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

19 引用 (Scopus)

摘要

Strain softening upon dynamic loading is a roadblock of most body-centered cubic (BCC) structured high entropy alloys (HEAs), which can easily lead to dynamic plastic instability. Here, the precipitation was applied in Al–Ti–V–Zr–Nb system BCC HEAs for enhancing strain hardening capability upon dynamic loading. The α2 precipitates (D019 structure, P63/mmc space group) with contents of ∼25% are developed with burgers orientation relationship (BOR) interface and homogenously dispersed in the BCC matrix. The α2 precipitates can effectively reduce the slip length, activate more slip systems, and impose high density geometrically necessary dislocations near interface for hardening. Owing to the BOR, dislocations can slip transfer across phase boundaries offering the co-deformation for plasticity. Compared with single BCC counterpart, the strain hardening rate is changed from negative to positive and the fracture feature transforms from cleavage to dimples. Consequently, a ∼60% increasement in the product of strength and ductility is achieved upon dynamic loading.

源语言英语
文章编号143964
期刊Materials Science and Engineering: A
856
DOI
出版状态已出版 - 20 10月 2022

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Wang, X., Wang, L., Li, T., Jin, K., Wang, B., Li, Y., Sun, S., & Xue, Y. (2022). Precipitation enhancing strain hardening capability of ductile AlTiVZrNb high-entropy alloys upon dynamic loading. Materials Science and Engineering: A, 856, 文章 143964. https://doi.org/10.1016/j.msea.2022.143964