Microstructure evolution and hot workability of in-situ synthesized Ti2AlC/TiAl composite

Yu peng WANG, Teng fei MA, Lei LI, Long long DONG, Wang tu HUO, Yu sheng ZHANG, Lian ZHOU

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The in-situ micro-nano Ti2AlC particles reinforced TiAl (Ti2AlC/TiAl) composite was fabricated using spark plasma sintering. The hot workability of Ti2AlC/TiAl composite was studied, and the effect of micro-nano particles on flow stress and dynamic recrystallization of composite was discussed. The results showed that the micro-nano Ti2AlC particles included strengthening and softening effects during hot deformation, resulting in the fact that the Ti2AlC/TiAl composite exhibited a higher flow stress and more sufficient dynamic recrystallization. The strengthening effect was mainly attributed to the Ti2AlC particles induced refinement strengthening and hindered dislocation motion at the initial stage. Moreover, the precipitation of nano-TiCr2 particles induced by stress concentration during hot deformation also contributed to higher flow stress via impeding dislocation motion. Meanwhile, the refined microstructure and dislocation pile-up caused by micro-nano particles during deformation provided more nucleation sites for dynamic recrystallization, which significantly promoted the dynamic recrystallization of the second stage. The present results reveal that the Ti2AlC/TiAl composite exhibited excellent hot workability, which is important to promote the application of TiAl alloys.

Original languageEnglish
Pages (from-to)3905-3918
Number of pages14
JournalTransactions of Nonferrous Metals Society of China (English Edition)
Volume34
Issue number12
DOIs
StatePublished - Dec 2024
Externally publishedYes

Keywords

  • dynamic recrystallization
  • hot deformation
  • microstructure evolution
  • spark plasma sintering
  • TiAlC/TiAl composite

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