Strength–ductility trade-off in TiB-TC4 composites with a pseudo core–shell structure

Yuanhao Sun, Zhixi Zhu, Qiang Wang, Xiaotong Jia, Wenjun Li, Zhaohui Zhang*, Xingwang Cheng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Heterogeneous structure is practical to improve the strain hardening abilities of materials due to the effect of hetero-deformation induced hardening, especially of composites. In this study, a series of TiB/TC4 composites with a pseudo core–shell structure of bimodal grain distribution were fabricated via a two-step ball-milling and spark plasma sintering. The synthesized TiB/TC4 composites have a structure of coarse lamella α-Ti grains of average 23.6 μm in diameter surrounded by fine α-Ti lamella grains of average 4.2 μm, with TiB distributed on the primary TC4 surface areas. TiB/TC4 composites with 0.4 wt% TiB2 exhibited the best comprehensive mechanical properties with an ultimate tensile strength of 1161.95 MPa (a 35.1% increase compared with that of pure TC4) and an elongation of 7.57%. In conclusion, the pseudo core–shell structure improved the strength by improving the strain-hardening abilities, achieved by the coordinated deformation between coarse grains and fine grains.

Original languageEnglish
Pages (from-to)574-584
Number of pages11
JournalJournal of Materials Research and Technology
Volume27
DOIs
Publication statusPublished - 1 Nov 2023

Keywords

  • Mechanical property
  • Pseudo core–shell structure
  • SPS
  • TiB/TC4

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Sun, Y., Zhu, Z., Wang, Q., Jia, X., Li, W., Zhang, Z., & Cheng, X. (2023). Strength–ductility trade-off in TiB-TC4 composites with a pseudo core–shell structure. Journal of Materials Research and Technology, 27, 574-584. https://doi.org/10.1016/j.jmrt.2023.09.234