A novel strategy to break through the strength-ductility trade-off of titanium matrix composites

Qiang Wang, Zhao Hui Zhang*, Luo Jin Liu, Xiao Tong Jia, Yang Yu He, Jin Zhao Zhou, Yuan Hao Sun, Xing Wang Cheng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This study used a solution blending method to coat Ti64 alloy particles with an organopolysilazane (OPSZ) precursor, creating (TiC + Ti3Si)/Ti64 composites via spark plasma sintering (SPS). During SPS, OPSZ decomposes, releasing silicon, carbon, and nitrogen. Nitrogen exits as NH3 and N2, while carbon and silicon partially dissolve in the matrix and partially react with titanium to form TiC and Ti3Si particles. The composite with 0.5 wt% OPSZ exhibited a tensile strength of 1135 MPa and an elongation of 19.0 %, 18.2 % and 28.5 % higher than commercial Ti64 alloy, respectively. The strength increase is attributed to grain refinement, solid solution strengthening, Orowan strengthening, and L phase strengthening. The improved ductility results from fine precipitates promoting dislocation multiplication, the dislocation storage effect of the interface L-phase, and matrix purification by H2 and NH3 from OPSZ decomposition.

Original languageEnglish
Article number108407
JournalComposites Part A: Applied Science and Manufacturing
Volume186
DOIs
Publication statusPublished - Nov 2024

Keywords

  • Mechanical properties
  • Microstructure
  • Spark plasma sintering
  • Titanium matrix composites

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